Engine Size: V6
Refrigerant Type: R12
Country of Origin: United States
I have an early 1990 with manual A/C.
A/C not as cold as before.
Compressor is good. Replaced the TXV and drier.
Recharged with R12.
The early models came with a STV on the evaporator.
This part is no longer carried by the dealer.
Cannot find it from the aftermarket.
Systems made after 1991 did away with the STV.
Has anyone replaced the 1990 evap with the 1991 evap????
Would anything else need to be changed???
Is there a retro fit kit????
Possibly a pipe that replaces the STV????
Called the dealer here. They were no help at all. Didn't even know what a STV was.
Also when I have the blower switch to 4, or high, the compressor turns off. All lower speed work fine.
Looking at the wire diagram, can't see any reason why this would happen.
Anyone have any ideas ?????digorok
Joined: Thu Jul 14, 2005 5:28 pm
Monitor the voltage at the relay for the compresor. Do you lose the control voltage? Trace backward to see where it drops off. Compressor is controlled by a relay which gets signal from control head. I'm out of town so I can't look up schematic. Can't remember but do you also lose the radiator fans also? Does the indoor blower motor function on high speed?
Tha inside blower works fine.
The rad fans cut off when the compressor cuts out.
I'll check the voltage, but I'm almost sure it's zero.
Try trouble shooting the radiator fan ckts. See what control signals are common. Check the inputs and outputs of the eccs module
Be sure it's not just reheating because the heater doesn't cut off completely.
The interior fan switch is probably bad. There is a lot of current flowing in position 4 and they tend to melt down. I think this circuit will have a wire from the switch that is grounded in all positions except off. This ground then flows through the A/C button, and if it is pressed, the relays will engage the condenser fan and compressor.
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