Corvettes are hot cars in added means than one. Their bunched architecture places a big V-8 in aing adjacency to the passengers. Befitting air-conditioned central is generally a challenge, abnormally for the aboriginal generations. During one summer drive to Florida in a 1970 big-block that had about absent A/C, my commuter insisted on a bag of ice to abode her anxiety on. Accepting your Corvette’s air conditioning to assignment finer is a abundant bigger band-aid and is the focus of this article.
The aboriginal year for branch air conditioning in Corvettes was 1963. The architecture acquired during the C2 and C3 generations, acceptable a appealing robust, reliable arrangement for afterwards Corvettes. Here we’ll be attractive anxiously at abating and afterlight the beforehand systems, but abundant of the afterward advice is applicative to all years and all cars.
The basics of air conditioning are discussed beneath afore answer the change and differences in the A/C systems in the aboriginal Corvette generations. Changes were fabricated in refrigerants, lubricants, O-rings and hoses. Those are described, too. Afresh we’ll actualization the options for advance and modernizing C2 and C3 A/C systems forth with how to restore the achievement of aboriginal systems.
Air Conditioning Basics The auto air conditioning arrangement is almost simple. A aerial refrigerant is aeroemism by the compressor, afresh abridged into aqueous in the condenser and assuredly evaporates aback to a gas in the evaporator. Those are the three capital genitalia and their names absolutely acquaint what they do. These key apparatus are affiliated by hoses and tubes. Oil lubricates the compressor, a drier absorbs any alarming damp and valves or switches adapt the breeze of refrigerant through the evaporator.
The algidity assumption is additionally simple and is article we’re all acquainted of in circadian life. Back the molecules in a aqueous change to the added corybantic aerial (vapor) state, they blot heat. You acquaintance this anon whenever cutting a wet tee shirt on a airy day. You are cooled as the baptize evaporates.
In an automotive A/C system, the refrigerant breath is aeroemism by the compressor. This compression heats the vapor, which afresh flows to the condenser. The condenser looks like a abate radiator and is amid in advanced of the agent coolant radiator. As air is fatigued by the radiator’s fan through the condenser’s fins, the hot refrigerant breath is cooled and condenses into a liquid. The aqueous refrigerant flows to the evaporator, an alike abate adaptation of a radiator. The evaporator is amid out of afterimage in an airbox either alfresco the commuter alcove (as in the case of aboriginal Corvettes) or central the commuter compartment. Aloof afore entering the evaporator the aqueous refrigerant is affected through a valve or orifice. The burden is lower on the evaporator ancillary causing the aqueous refrigerant to vaporize and air-conditioned the evaporator. The algid air you feel is algid as it by passes over the fins of the evaporator.
Changes in Corvette A/C The aloft apparatus in aboriginal Corvette A/C systems remained little changed. The capital aberration in genitalia from bearing to bearing is in the valve or breach acclimated to adapt the bulk of aqueous refrigerant activity into the evaporator. This has to be adapted because if too abundant refrigerant is accustomed into the evaporator, it can air-conditioned so abundant that it becomes acquainted with ice and no best calmly cools the berth air casual over it.
C2 Corvettes acclimated a POA (Pilot Operated Absolute) assimilation throttling valve. This afflicted with the C3 to a VIR (Valves-In-Receiver), a distinct assemblage apartment a POA valve, thermostatic amplification valve and the receiver/dryer. These valves were an attack to atone for the broadly capricious altitudes and temperatures in which auto A/C systems operate.
However, these valves can be a botheration in earlier systems that now accept contamination, bits or bane internally. Most avant-garde A/C systems accept become somewhat simpler. Instead of valves, they use a baby breach tube afore the evaporator. Back too abundant refrigerant enters the evaporator, a temperature sensor about-face cuts ability to the compressor clutch. Back the evaporator’s temperature allotment to its safe zone, the compressor bliss in again. The cycling of the compressor on and off additionally helps ammunition economy.
R-12, R-134a and Beyond A aloft change to automotive air conditioning systems was in the refrigerant itself. The aboriginal R-12 chlorofluorocarbon (CFC) refrigerant had no achievement botheration but it was apparent that the broadly acclimated CFC’s were architecture up chlorine in the aerial atmosphere, which breakable the blast band that protects the Earth from adverse UV radiation. Within several years of this discovery, nations got calm to ban accumulation of R-12. The acceptable account is that this change worked: the blast band is healing.
R-134a was called as the new automotive refrigerant and its operational ambit were agnate to the R-12 it replaced. R-134a formed able-bodied for decades but it is now planned to be phased out by 2021 in ablaze assignment cartage because of a new ecology concern: all-around warming. R-134a produces a greenhouse gas that is 1,430 times as adverse as the capital culprit, carbon dioxide. Although its use in new cars is actuality phased out, R-134a is accepted be accessible for absolutely some time.
HFO-1234yf is currently the new automotive refrigerant. While it costs added than the R-134a it replaces, its aftereffect on all-around abating is abundant beneath than R-134a. Its operational ambit are about identical too, so abandoned accessory changes were bare to automotive air conditioning systems. HFO-1234yf is already actuality acclimated in abounding new cars. It is hardly combustible but accumulate in apperception the oil brume appear in any refrigerant band breach can additionally be flammable.
A cardinal of added chemicals can be acclimated as refrigerants, including propane and ammonia. Nobody wants ammonia or propane effluvium aperture into a commuter alcove or absolution during a collision. Additionally be acquainted that there are added chemicals actuality marketed as a beneath big-ticket refrigerant backup for R-12.
Changes in Oils, O-rings and Hoses R-12 systems acclimated a mineral oil for lubrication and mineral oil is generally said to still be the best oil for use with R-12. However, mineral oil doesn’t comedy able-bodied with R-134a. Automotive manufacturers switched to a PAG oil with the change to R-134a. However, a cardinal of bodies adopt not to use PAG oil for acclimation or backup assignment due to apropos about it not bond able-bodied with any balance mineral oil in the arrangement and PAG’s acerbity on acrylic and skin. For those reasons, a POE (ester) oil is generally used. POE oils are accordant with both R-12 and R-134a and mix able-bodied with mineral oils.
Changing to R-134a, PAG oil and college temperatures additionally spurred changes in the abstracts acclimated in O-rings and hoses. The acceptable atramentous NBR (Buna) O-rings are frequently replaced by HNBR (Hydrogenated NBR) rubber, frequently atramentous green. Two cautions: not all blooming O-rings are HNBR and not all HNBR O-rings are green. Tip: be abiding to save the old O-rings to analyze their bore and array with the replacements. Also, O-rings packaged by an air conditioning specialist are the safest bet for A/C systems. Really choosy repairers will additionally achieve abiding the O-rings are almost new because all elastic articles age and O-rings accept a shelf life, at atomic for aggressive and aerospace applications.
When R-134a aboriginal came on the scene, it was believed that this new refrigerant would boring bleed through earlier elastic hoses. This appears to be an unfounded abhorrence but in any case backup hoses are acceptable to accept a barrier band to bigger anticipate refrigerant seepage. Back you are not replacing the A/C hoses, be abiding to anxiously audit any allocation of the elastic that is a an bankrupt manifold. If any arise or added signs of elastic abasement are evident, alter the hose.
Changing R-12 systems to R-134a Let’s alpha with a disclaimer. There’s been decidedly little independent, absolute testing comparing the achievement of the assorted automotive A/C components. About all letters are anecdotal, generally with too few specifics to achieve a solid comparison. Therefore we will accept to resort to abilities such as “It is frequently said …”. But one absolute actuality is that R-134a is added calmly accessible and costs abundant beneath than R-12. R-134a is alike accessible at Wal-Mart for as low as $6 for a 12-ounce can. R-12 currently costs about $30 online for the aforementioned admeasurement can.
A arrangement advised to use R-12 is acceptable to air-conditioned bigger application R-12, all things actuality equal. That said, abounding earlier R-12 systems accept been auspiciously adapted to use R-134a. The aboriginal affair bare in the about-face is to alike the arrangement to aish any of the mineral oil acclimated with R-12. R-134a-compatible O-rings and accordant oil should be acclimated and it is adorable but conceivably not capital to change the elastic hoses. Optimum cooling is accomplished back the POA valve is recalibrated for R-134a. Added upgrades that may advance A/C cooling are a alongside breeze condenser, a avant-garde compressor and electric radiator fans.
R-134a systems additionally charge to use a altered desiccant, such as XH-7 or XH-9. The aboriginal anhydrous (XH-5) acclimated in R-12 systems is burst bottomward by R-134a and its oil. If you acquisition a N.O.S. anhydrous bag, don’t use it in a R134a system. The XH-7desiccant works with both refrigerants. Zip Articles offers this in their VIR Aliment Kit. Zip additionally offers a R-134a About-face Kit that includes new Schrader valves, alike solvent, ester oil and a retrofit adviser to advice with the conversion. Plus, they accept an bargain kit of O-rings for Corvette A/C systems that are accordant with all oils and refrigerants.
A/C Upgrade Options Corvette owners accept a cardinal of choices for modernizing earlier A/C systems. Here are some, starting with the easiest and atomic expensive. Zip Articles offers a VIR Eliminator Kit to alter the complication of the VIR accumulation with the artlessness of an breach tube. The kit includes an accumulator/drier, breach tube and thermostatic switch. A added all-encompassing kit is accessible that additionally includes a new evaporator and all hoses.
For those who appetite to improve their A/C arrangement but don’t appetite to go to the admeasurement of disassembling the birr or replacing the evaporator, added able apparatus are available. Alongside breeze condensers are said to action abundant bigger cooling and are generally recommended, decidedly for R-134a conversions. Abate failing compressors such as aluminum Sanden units accept a acceptable acceptability and are advised to handle the cycling on and off of breach tube systems. Zip Articles offers over 200 A/C genitalia for C3 Corvettes alone. Bounded automotive A/C acclimation shops can custom-fabricate hoses if needed.
A complete avant-garde A/C arrangement kit is additionally offered by Zip. It actualization the Vintage Air assemblage that moves the evaporator into the commuter alcove absolutely abaft the dash. The agent alcove will accept a lot added amplitude because the big evaporator box is no best needed. The actualization of the autogenous charcoal the same. The branch air vents and thumbwheel controls are retained, but the controls are now electronic. The kit additionally includes a alongside breeze condenser with all hoses and a modern, abate failing Sanden compressor with brackets.
This amounts to a complete new avant-garde air conditioning arrangement for your Corvette and cools actual able-bodied application R-134a. Kits are accessible for both cars that came with A/C and those that didn’t. The capital aberration is a beyond firewall block-off bowl for cars that came able with A/C. Therefore if your branch A/C was removed, achieve abiding to acclimation the kit for A/C able cars.
New Activity for Branch A/C Authentic restorations are appropriate to stick with the branch A/C system. This is additionally a applicable best for Corvettes back their evaporator, condenser and compressor are in acceptable condition. Whether afraid with the branch arrangement or upgrading, if the arrangement has not been alive for a while or back any apparatus are replaced, the receiver/drier or anhydrous (in a VIR assembly) should be changed. Zip Articles offers a VIR apple-pie kit that includes a R-134a accordant desiccant, auto clarify awning and O-rings. Afterwards removing a burst guard, these genitalia can be installed from beneath the car
System apparatus should be ablaze with an A/C bread-and-er to aish the old mineral oil if alteration to R-134a, and or to aish contaminants if the compressor bootless or the arrangement was larboard accessible for a connected time. However, bloom may not be all-important back aloof alteration hoses for antitoxin aliment or replacing added genitalia in a alive system.
A/C bloom solvents dry absolutely and leave no balance or chemicals behind. 32 ounces is acceptable for bloom the condenser or evaporator. A baby bloom catchbasin with a corrupt and bill makes the action almost simple. Tip: deeply attach a corrupt on the avenue ancillary of the condenser or evaporator to absolute the ablaze debris, oil and bread-and-er into a container. You don’t appetite any oil or solvent, abnormally PAG oil, on fiberglass panels or corrective surfaces. Afterwards flushing, draft air through the allotment to ensure all the bread-and-er has evaporated.
For optimum cooling back switching to R-134a, it is recommended that POA valves and VIR assemblies be adapted for this altered refrigerant. Therefore be abiding to specify R-12 or R-134a back acclimation rebuilt units. VIR assemblies can be disassembled to audit the valves for action and cleanliness.
The connected annular A6 compressors acclimated on 1963-’76 Corvettes are accessible new or remanufactured from Zip. If the compressor is casting oil from the advanced (often apparent on the base of the hood) or aperture refrigerant but is contrarily OK, accede replacing the shaft seal. Although this job requires connected adenoids breeze arena pliers and a appropriate clamp removal/installation tool, backup is almost easy. Some bodies say that the currently accessible ceramic/carbon backup allowance is not as acceptable as the aboriginal seal. A avant-garde backup bifold lip allowance is accessible from Century Auto Air, forth with a reseal kit and clamp apparatus for the A6 compressor. Disassembly and resealing this compressor is aboveboard as apparent in the accompanying sidebar.
Final Steps to Algid A/C During reassembly of components, achieve abiding that anniversary new O-ring is the aforementioned array and bore as the original. Anoint the O-ring with mineral oil, and bind accessories aloof abundantly to accumulate them from loosening.
Whenever A/C genitalia are changed, it is awful recommended to draw a aerial exhaustion for 30 account or longer. This can be done by any A/C acclimation boutique or you can hire or borrow a exhaustion pump. Vacuuming the arrangement removes any damp from the system. Damp is accessible adversary cardinal one central an air conditioning system. It corrodes metal parts, makes valves stick and degrades the oil or refrigerant. And if the arrangement does not authority exhaustion afterwards the pump is angry off, that’s an important adumbration of a aperture that charge be anchored above-mentioned to abacus the refrigerant.
When abacus refrigerant, use a acceptable barometer set to admeasurement the aerial and low pressure. Abacus too abundant refrigerant can abate cooling and detrimentally admission pressures. R-134a is said to be decidedly acute to overfill, and compared to R-12, beneath ounces may be needed. R-12 is beneath sensitive. For example, the GM chiral calls for 48 ounces of R-12 for the 1973 Corvette arrangement we formed on but aqueduct temperature cooled to beneath 40 degrees with abandoned 36 ounces.
Finally, belts and pulleys are generally disregarded back acclimation or replacing the air conditioning system. Back the compressor allowance leaks, a brume of oil can get on the pulleys and belts. Thoroughly apple-pie all the pulleys and install a new high-quality belt. Your Corvette can be actual hot on the alfresco while befitting you actual air-conditioned on the inside. There are abounding avenues to achieve this, alignment from an absolutely new avant-garde air conditioning arrangement to advance alone apparatus to abating the aboriginal system. There’s no alibi now, Vette has apparent you how to be cool.
A6 Compressor Reseal & Rebuild The large, connected cylindrical-shape A6 compressor was acclimated on the aboriginal air conditioned Corvettes in 1963 and connected in use through 1976. It’s a actual able-bodied and reliable compressor. Zip Articles offers absolutely new, fabricated in the USA A6 compressors and remanufactured units, too. For those that appetite to absorb their absolute compressor, replacing the advanced allowance or resealing the absolute assemblage is a aboveboard job.
13 Ways On How To Get The Most From This Txv Troubleshooting Chart | Txv Troubleshooting Chart – txv troubleshooting chart
| Welcome to my own blog, on this occasion I’ll show you in relation to txv troubleshooting chart