Question about 2000 Chevrolet Tracker

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Need to locate A/C compressor control module and A/C comp. relay on a 2000 chevy tracker. I am getting no voltage at comp clutch. If I jumper to battery clutch works fine and blower unit kicks out cold air, system pressure checks out OK.

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This is a year late.... but perhaps someone else is having some issue as this. I'm possibly in need of a NEW a/c compressor control module, I have a diagram of the removal procedure, which is by means of opening the glovebox, pushing in the left and right sides of the compartment and lower it to reveal the area the module is housed. So... I'm not sure it will solve my problem which is: my a/c compressor surges on and off every 20 seconds. Mechanic thought it was the compressor, so a new one was installed, but it keeps surging. Not to mention a weird aspect as well.....when the fan is "on" whether in a/c mode, defrost, or fresh 4x4 light on the dash instrument panel near speedomometer flashes on and off when on. Turn off the fan, the 4x4 light goes off. Trying to figure out both of these now! Any help since your issue appreciated!

Posted on Nov 11, 2011


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HVAC Compressor Controls Circuit Description
The operation of the A/C compressor clutch is controlled by the body control module (BCM) and powertrain control module (PCM). The BCM receives an a/c request signal from the heater a/c control assembly through circuit 66. The BCM then sends a class 2 serial data message to the PCM through circuit 1807. Power for the a/c compressor clutch relay is supplied by the A/C BFC fuse and circuit 439. When the PCM receives an a/c request message from the BCM, the PCM grounds circuit 459 allowing the a/c compressor clutch relay to engage. Ground for the a/c compressor clutch is supplied through circuit 450.
Do you know what a class 2 serial data message is ?
Class 2 data is a high speed data transmission. In order to control serial data line traffic, class 2 uses the peer to peer method along with message arbitration in order to manage the data line traffic. The class 2 data line includes the following control modules:
The body control module (BCM)

The electronic brake control module (EBCM)

The powertrain control module (PCM)

The sensing and diagnostic module (SDM)

You need a factory scan tool to diagnosis , it's the only way to see if transmission is sent an received !
The intake air temperature (IAT) sensor is a thermistor which measures the temperature of the air entering the engine. The Powertrain Control Module (PCM) applies 5.0 volts through a pull up resistor. When the intake air is cold, the sensor resistance is high and the PCM will monitor a high signal voltage on the IAT sensor signal circuit. As the intake air warm, the sensor resistance becomes lower causing the PCM to monitor a lower voltage. If the PCM detects an excessively high IAT sensor signal voltage (low temperature indicated), DTC P0113 will set.
Test the signal circuit of the IAT sensor for a short to voltage. Refer to Wiring Repairs in Wiring Systems.

Do you ko

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There is also a relay to check. If relay is ok, the compressor clutch or wiring to it may be faulty

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this is common if the fuses are good then you have a bad relay, this relay is called a relay module and it has a few relays in it and has to be replaced as a unit, this is located under the air filter housing, heres a picture of it to help you locate it. hope this helps.1406de6.jpg

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AC Compressor not engaging on 2000 Chevy Impala. Fuses and AC relay okay. No power at compressor. Need wiring diagram. Also need to know if compressor requires 12v for operation. If not what should voltage...

When your R-134a runs too low it will NOT engage the compressor. You need to refill your a/c system before the clutch will engage, I also suggest finding the leak.

Apr 20, 2010 | 2000 Chevrolet Impala

2 Answers

A/c compressor wont come on unles you put a jumper wire to the b

I would check the pressure on the system first. If you have a leak in the system the pressure will drop and keep the compressor from cycling on ( keeps you from burning up the compressor) If the system is indeed holding pressure, the problem can be a compressor relay, on GM products this is normally under the hood close to the firewall. It also can be the A/C control module not funtioning. (Not sending voltage to the compressor clutch) On many of the newer systems the components( ie: clutch, hi-pressure switch, low pressure switch, relays) are already energized and the control module just completes the circuit to ground. In other words when you check for voltage at these items it will be present, even though the unit may not be engaged.

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Please describle the location of the a/c compressor clutch fuse in a Chevy Tracker 2000.

there is a power distribution box under the hood which under the lid of this box it will tell you which relay is for what .. Also your air conditioner wont come on if its low on freon.. even a little low it has a pressure switch which keeps the clutch from working to protect your system when low on freon.. holler if you need more .. Jerry

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unhook wire going to compressor. make a jumper wire and run from positive post on battery to wire going to clutch on compressor. if clutch engages, you have a blown fuse, bad a/c relay or the switch in dash may be bad. the main fuse box is located in engine compartment.

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