Question about GMC Jimmy

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Hey bro....I have a 2000 GMC Jimmy. Two problems exist. #1 my ac doesn't engage when the switch is in the cool positions. I've checked the control voltage at the Accumulator, 13.5 in and 13.5 out, no problem with the freon level. All the fuses are good. I've swapped the horn relay with the AC relay, still no good. I can run a jumper from the batter directly to the AC and it does pull in and cool fine. HELP bro...I've not yet been able to locate a wiring diagram on line. Next ... now and then I get the service engine light gig....I suspect something in the EVAP as I can smell fumes at times. Also, if you fill the tank FULL ... there is liquid coming from somewhere, appears to be at the top of the tank. The vehicle runs fine, and the light goes off by itself after a about a half dozen engine cycles. Any clues.

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Part of the reason you are having trouble trying to understand why your A/C will not engage is because you are not working with an "Old School" system where the low pressure switch at the accumulator actually cut the power to the A/C clutch itself. You are working with a computer-controlled system where the low pressure switch grounds a "sensing" circuit to the Powertrain Control Module (PCM). The PCM controls the A/C clutch by activating the Compressor Clutch Relay, which is located in the Underhood Fuse and Relay Box.
The secondary side of the relay (the part that actually turns the compressor on) can be diagnosed with a simple test light. To verify the circuits on the primary side (the part that the computer controls) requires a scanner with software capabilities to go into the PCM and command the relay ON. The circuits from point A to point B can be verified with a digital Volt/Ohm meter, but proper operation of the PCM can only be verified with a scanner.

Please also review these articles:
What Else Could Be Wrong?
Where's The Fuse?

As for your check engine light...The ONLY way to find out why the light is coming on is to scan the PCM with a scanner and retrieve the fault codes and diagnose the system accordingly. I would say that you are probably correct in assuming that it may be EVAP-related if you are smelling gas fumes and getting fuel spilling out on the ground. My recommendations on this is to get it diagnosed and repaired as soon as possible before you blow something up. Gas fumes are nothing to play with. Not only are they highly explosive, but they can be extremely toxic as well. We won't even get into the fact that it is obviously dumping HUGE amounts of hydrocarbons into the atmosphere (which is the reason for the EVAP system to begin with). Then there is the fact that if these hydrocarbons are getting out of your fuel tank, that means that your fuel (AND YOUR CASH) is evaporating.

Posted on May 21, 2011

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The vcm (vehicle control module) is looking for a ground through the compressor cycling switch. The black/white wire should be connected to ground. If you have batt. voltage on both sides of switch connector, a ground is not present, find one
The high pressure switch (usually on the back side of the compressor) is used as a pathway for voltage from the control head switch to the vcm as a ac request signal. ultimately the vcm energizes the ac clutch relay. On some GM vehicles if the vcm sees a low freon condition for too long, it will have to be reset (batt disconnect).
2nd- fix the fluid leak on top of the fuel tank first (safety issue). then read vcm trouble codes. depending what the code is, what the repair will be.

Posted on May 21, 2011

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