ATTN. GREG, YORK COMPRESSOR DATA

[Doyt W. Echelberger]

Here is some more data on York compressor seals. Hope it doesn't overload 
your system:

7/25/97. There is a suspected seal compatibility problem with Autofrost 
(R-406A) and Autofrost-X4 with York (automotive) compressors using Butyl 
rubber seals in some cases. Seals may fail (usually 30 mins to one hour) 
after the car is turned off, due to heat soak from the radiator bleeding 
into the condenser and raising pressures. Leaky heater water valves 
contribute to the problem since they allow heat to build up in the 
evaporator area, further increasing pressures. Dirt buildup in the radiator 
and condenser area also contributes by preventing the release of trapped 
heat after the engine is turned off. Neoprene seals are available which 
appear not to have this problem. For more info, contact Bobby Burke, ATC 
specialists, 1-800-622-5008, or email bburke at intersource.com. Web page: 
http://www.kiva.net/~bburke Autofrost (R- 406A) and Autofrost-X4 (GHG-X4) 
move more heat than does R-12. Cars with poorly maintained cooling 
(radiator) systems, may encounter radiator boilovers and overheating 
problems when changing to Autofrost, since more heat is transferred to the 
condenser, which rejects the heat into the radiator. It is a good idea to 
have the engine cooling system checked over when switching to Autofrost to 
prevent a dirty/clogged radiator or leaking heater water valve from causing 
A/C problems. There was a suspected seal compatibility problem with 
Autofrost. York, Techumseh and the old Chrysler RV2 compressors were 
thought to have a butyl rubber seal, however it has been discovered that 
these seal kits were made of Buna-N rubber. It has been known for many 
years that R-22 and Buna-N rubber are not compatible. Our research 
indicates that neoprene 70 is the best material for both compressor shaft 
seal kits and system O-rings. The makers of the York compressor have now 
started making their seal kits with Neoprene and manufacture neoprene seal 
kits for most other compressors on the market as well. Neoprene is the 
ideal rubber for both compressor seal kits and O-rings since it will work 
with all refrigerants including Autofrost and R-134a. There might still be 
"new old stock" seal kits on the shelves at local parts stores so 
technicians should ask before they buy them. We are currently discussing 
stocking and selling these seal kits and we are working on a master O-ring 
kit that will service most vehicles, foreign and domestic. We will make 
these available through Monroe Air Tech Inc. or tell you where they are 
available as we are constantly searching for other sources. O-rings are 
already available at most parts places. Four Seasons, Murray, and Everco 
have Neoprene and they are dark blue in color. GM has used a black neoprene 
for several years. These are available from GM dealers or AC Delco 
distributors. There are also green O-rings known as HNBR. This rubber was 
developed for R-134a because it was thought to have better heat 
characteristics. Also Ford used this material for their spring lock 
fittings. They even used an odd size (thicker) to try and keep these 
fittings from leaking. Autofrost will work fine with this rubber if it came 
from the OEMs, however HNBR O-rings that are purchased elsewhere are many 
times of cheap quality and will not fare well. For this reason we ask that 
you to always ask for Neoprene. [4/15/97 update: Bob Burke @ ATC 
Specialists now has shaft seal kits and O-ring kits available] On 86 and 
newer Ford models, safety pop-off valve on or near the compressor has a 
rubber seat. If this valve ever opens, then it might not reseal and leak. 
The cure is to use a GM pop-off valve instead (they use steel ball and 
seat?). We have also seen the Ford pop-off valves open at about 250 PSI, 
which is way too low. ALL BLENDS, INCLUDING AUTOFROST, MUST TO BE CHARGED 
AS LIQUID to prevent composition change, and possible damage resulting to 
the system. Autofrost/R-406A/Chill-it/R-414A cylinders contain a DIP TUBE 
that withdraws the product as liquid from the bottom with the cylinder 
UPRIGHT. DO NOT turn the cylinder upside down to get liquid!! This will 
give you vapor instead. Cylinders are marked with arrows to keep upright 
for liquid. No matter how much laboratory testing is done under simulated 
and elevated temperature conditions on materials compatibilities, field 
conditions are not always simulated properly. For instance, some material 
breakdown will be noted in a lab sealed tube test, at say, 300 degrees 
Fahrenheit. Most chemical reaction speed is determined by temperature, 
often decreasing by a factor of two for each 10 degrees the temperature is 
lowered. Failures in a sealed tube test in a lab at high temperatures often 
equate to 40 or 50 years or longer at normal temperatures encountered, far 
longer than the life of the car. Quoting from a DuPont publication 
materials compatibility section: "Actual refrigerant compatibility in real 
systems can be influenced by the operating conditions, the nature of the 
polymers used, compounding formulations of the polymers, and the curing or 
vulcanization processes used to create the polymer. Polymers should always 
be tested under actual operating conditions before reaching final 
conclusions about their suitability" [1]. Compositions close to Autofrost 
(R-406A) have been used in actual vehicles since August 1990. For further 
information on compatibility issues, contact Bob Burke, ATC Specialists, 
1-800-622-5008 or MEA, 1-888-AUTOFROST [1-888- 288-6376], ask for code 10. 
[1] "DuPont SUVA(R) MP Refrigerant Blends: Properties, Uses, Storage and 
Handling, page 20, stock number H-45944-2 (5/93), DuPont Chemicals, 
Fluorochemicals Customer Service Center, Wilmington, DE 19898.


 >>>>>>>>>>>>>>>>>>>>>>>>>>>>
5 cylinder CIS cars from VIN 85 C 000 001  used a York compressor, 
according to my Bentley.

Doyt Echelberger

 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
At 07:58 AM 6/20/2001 -0400, you wrote:
>Hello All,
>Does anyone know the model of the compressor that was used on the 86' 4kq?
>I am trying to locate the parts to reseal my compressor, but most places
>list by manufacturer model number, not by car.
>Thanks!
>Greg Roa
>Cincinnati, OH
>86' 4kcsq
>93' 90 CS
>83' 944