Question about GMC Cars & Trucks
Trouble shoot the digital climate control
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: heater problems
there is a blower motor control unit under the hood on the right side near the firewall, unplug this and it should stop running. normal problem for a lot of gm cars with electronic climate control
Posted on Nov 30, 2008
You really want to troubleshoot your AC. Here are some items to follow:
1- Make sure your Compressor clutch work first. You can jump the wire to test it when the engine is off.
When you know the clutch work then you can look for the other things not makeing it activated.
2- It it doesn't work then you know the problem right there.
3- If it works then check the Low and high pressure according to compressor spec.
3- Check your engine temperature sensor. Don't think that your temp reading gauge is coorect then your engine temperature for your AC is working.
4- Check your compressor sensor speed. It has to be in sych with your crankshaft sensor before it allows the clutch engaged to prevent burning your compressor when it is locked up is in freezing mode ( ex.in case some clever people jumping wire to control the clutch bypassing all other rerquirement).
5- If you think these items need to be addressed by professional better then do-it yourself then I have no objection. Good luck on trying.
Posted on Jul 09, 2009
unplug the blower motor, try that, i have seen a direct short in the blower motor cause that. also check the blower moror resistor--again another fault---hope that was helpful
Posted on Aug 06, 2009
Testimonial: "Appreciate the help dodge360 - you nailed it. Replaced the blower motor and all is good."
those control units in the crown vics **** out all of the time. they're not cheap from the dealer, try auto parts stores for aftermarket or junk yards.
one trick we did with cabs was to pull the unit out and splice the black and blue vacuum lines together. that's great for summer, but you have only vent then.
Posted on Oct 04, 2009
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