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88 toyota air conditioning problem

macs_5 on Fri July 10, 2009 11:12 PM User is offline

Year: 88
Make: Toy
Model: 4x4
Engine Size: 22RE
Refrigerant Type: 134A
Ambient Temp: 88
Pressure Low: 20
Pressure High: 310

Okay, the truck has new drier, expansion valve, new vsv, evacuated to 700 microns with DV142 vacuum pump. The ac air outlet temp measured 95 degrees to 101 with electronic temp indicator (the temp increased as high side pressure climbed). Outside ambient 88 degrees. The idle up system is working now and all the electrical controls seem to be operating. I am thinking that the compressor is bad? Anybody got another direction to look? Oh yea, what exactly or where exactly can I find info on the ac amplifier and what its function is and how it controls the system? The system was charged with about 3/4 can of R134A. Thanks for your help.

Chick on Sat July 11, 2009 6:56 AM User is offlineView users profile

low side 20, high side 300+ nothing wrong with the compressor, it's doing what it should.. If the vent air is hotter than the ambient temp, you have hot air blending into the vents from the heater core.. I would also check air flow over the condenser, as a half a can (about 6 ounces) giving you a high side reading like that indicates poor air flow, a lot of air in the system or blockage in the system..

Email: Chick


Freedoms just another word for nothing left to lose

macs_5 on Tue July 14, 2009 4:16 PM User is offline

Thank you for the confirmation. I had moved beyond the compressor and was starting to look for blockage and your suggestion about flow got me to thinking that just because the controls all move smoothly, does not mean they work, so went gopher and crawled up under the dash and started with each lever and cable. Toyota does a peculiar thing with their heat ac system manual, the heat section is located in the electrical chapter and the ac has its own section. I kept looking for heater in the cooling system chapter and found nothing, finally started looking thru each chapter that might have a remote possibility of being where the info I was searching for would be found. In any case, the water valve was jammed open in the heat position, explained the 95 degree- 110 coming out of the ac vents. opened it and reset the cable, quite a difference right off the bat, but still not getting the head pressure I wanted to see. So, took a shop fan and blew it into the radiator/condenser from down below and angled up at 45 degree angle. (4x4 with a pretty good lift from the factory & 32 inch tires) Head stated coming down. Hooked a strobe light up to ignition and checked fan, found it de-clutched, not circulating enough air. So in summary, fixed the VSV and got idle up to work, moved water valve to cool position and reduced duct temps, improved air flow over condenser and reduced head pressure to 250 and 30 lo side on 95 degree day. 41 degree air at center vent with recirc on and idle at 2,000 rpm. Pretty damn close to the 39 degrees that toyota calls for with R12 and this system is running 134A. Well gotta fix the fan clutch and replace water valve and believe that will correct last problems. Thanks for the help and I do know that a lot of folks do not ever come back and report their findings/results so that others can learn from them. Regards,


mk378 on Wed July 15, 2009 10:27 AM User is offline

Look at some of the other Toyota truck threads where TRB describes a way to take a worn out fan clutch and convert it to being locked up. Might be a good idea if you do a considerable amount of driving in the city or off-road.

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