Question about 2006 Chevrolet Silverado 2500HD 2WD

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I have a 2006 chevy duramax 2500 6.6L diesel ac does not come on. Freon is good fuses ok relay ok pressure sensors ok. Compressor ok i can manually turn it on by grounding ac relay on. only thing left is pcm or ac control head. any common problems with this?

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Some of these newer ac systems use safety pressure switches on the low and the high pressure lines , ck and see if yours has 2 and ck accordingly,,,goodluck...

Posted on Jul 07, 2010

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Jump the relay w a paper clip or a stand of wire. Are u sure your Freon is low. there are other reasons the compressor wont engage. Too much Freon can cause damage too!

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check all fuses first. does ac compressor come on? if not, unplug pressure switch in low pressure line near where you add freon and short across pigtail. comes on now and cools? replace switch. if not plug back in. apply manual voltage to ac compressor. comes on and cools? if not compressor or clutch is bad. if it does, check ac relay. that's about all you can do with limited tools in the driveway. if no progress has been made, time to take it to the pros.

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there is no relay in that box that is called the tipm or totally integrated power module. that module is controlled by a computer and should be checked with a scanner to see if you have a code for the a/c. i m having the same problem i have been told it could be low freon but can not get the clutch to engage to check the high and low pressure. Also read where it may be the diode in the clutch on the ac compressor if you have a multimeter probe the compressor a good compressor will read somewhere between 3.5 and 4.0 anything else and clutch needs to be replaced. other possibilities may be the high or low pressure switch on the line. on myh 2006 2500 diesel it is located near the plug for the compressor on bottom side of motor. hope this helps.

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