Most common location(s) for AC refrigerant leaks on the 1990 LS400
06-06-19, 12:04 PM
#1
Driver School Candidate
Thread Starter
Most common location(s) for AC refrigerant leaks on the 1990 LS400
I have a 1991 LS400 and am wondering (for those experienced in this area) which location(s) these things like to leak AC refrigerant on this vehicle. I know the EPR valve diaphragm likes to deteriorate/leak (and there is an EPR delete procedure that some have tried) but I am wondering, besides the EPR, what other areas are known to have a high probability of leaking (this car only has 107K on it). I will ultimately do the full leak detection procedure with dye and a sniffer
06-06-19, 05:16 PM
#2
Driver School Candidate
Thread Starter
A little more history on the vehicle -- the AC did not work when I purchased it and it had zero charge to it. I put about 8 ounces of refrigerant in it, just as a test... (R134A conversion came with this car) and the low side reads 5psi and the high side reads 100psi with the AC on full blast. The compressor does come on. Given the disparagment between the low and the high... it is clear that something is out of order in the system (possible expansion valve clog or issues with the EPR). Looking for any insight you folks might have into this situation and my original question in my first post. Thank you.
06-07-19, 02:01 AM
#4
There are alot of places that can leak. The compressor seal would be number 1, then just about anyplace there is an o ring, and that is every connection, yes that epr you mention. Then of course hoses and the evaporator, condenser, etc. etc. Actually I'm changing number 1 leak to the valve cores that are at the high and low pressure ports where the manifold gauges connect.
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chadr
LS - 1st and 2nd Gen (1990-2000)
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04-30-07 08:50 PM