Question about Cars & Trucks
A/C inoperative. Tried to Hot Wire A/C Clutch... no go. Not seeing Power to A/C System. Blower Fan Blows... Fuses OK... Relays OK... Hidden Fuse??
What year is the truck, and where did you run the hot wire from ?
If the ac clutch is working, and you put power to it, it should engage.
Posted on Jul 17, 2013
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Posted on Jan 02, 2017
Break Down And Replace The Blower Motor
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIR-BAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN AN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY OR DEATH OR DEATH.
NOTE: The blower motor is located on the passenger side of the vehicle under the instrument panel. The blower motor can be removed from the vehicle without having to remove the HVAC housing.
Posted on Feb 07, 2009
I have something you can check. The system has a low coolant safety usually plugged in about midway of the coolant reservoir. There will also be a plug above that one for the high coolant safety. If the mechanic let too much freon out of the system when he changed the motor the safety will not allow your clutch to kick in or send power to the relay. The way you can check this is to unplug it from the reservoir and take a straight wire and jump across the plug. If the clutch kicks in when you do this that's your problem. I would only do this to test it then take the wire out. You don't want to run it with the low coolant jumped out for too long.
I hope this helps and have a great weekend
Posted on Jun 06, 2009
Hot wire the fan to the battery...If it fails to go on, the fan itself is bad. You sure the compressor is engaging? Generally even if the fan isn't on, there is enough air going through the grille to keep a/c cool.
Posted on Jul 28, 2009
you either have a power loss problem but more likley your low on refrigerant. if its low, there is numerous pressure sensors that will not allow it to engauge to protect the compressor. you got to put a gauge on it. standing system at 80"F should have about 80-90 lbs. standing pressure.
Posted on Aug 25, 2009
Load placed on the engine takes place when the Compressor clutch engages. It will not engage if the system charge is too low on freon. It needs to be checked with a gauge, I think that may be your problem.
Posted on Apr 22, 2010
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