My 2007 Jeep Patriot AC is not blowing cold air. Compressor does not engage but I’m not able to increase enough Freon pressure so that the compressor kicks. I want to relay bypass it to know if the compressor is good or not but I don’t know how. Any help would be appreciated.
AC compressor clutch relay bypass
Beto07
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My 2007 Jeep Patriot AC is not blowing cold air. Compressor does not engage but I’m not able to increase enough Freon pressure so that the compressor kicks. I want to relay bypass it to know if the compressor is good or not but I don’t know how. Any help would be appreciated.
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12,339 Posts
There's no relay for the A/C compressor, the compressor's internal solenoid is driven by the PCM.
![Image]()
Note that the compressor uses engine bay ground G110, a known source of ground related problems due to corrosion of the wires under the eyelet crimp and insulation where they can't be seen. The fix is to cut the old eyelet off, strip the wires back to good metal, and add a new eyelet.
www.jeeppatriot.com
Note that the compressor uses engine bay ground G110, a known source of ground related problems due to corrosion of the wires under the eyelet crimp and insulation where they can't be seen. The fix is to cut the old eyelet off, strip the wires back to good metal, and add a new eyelet.
G110, G111, and G112 ground location and wiring diagrams
G110 G111 & G112 G111 G112
www.jeeppatriot.com
But how can I tell that this is the actual problem?There's no relay for the A/C compressor, the compressor's internal solenoid is driven by the PCM.
View attachment 98848
Note that the compressor uses engine bay ground G110, a known source of ground related problems due to corrosion of the wires under the eyelet crimp and insulation where they can't be seen. The fix is to cut the old eyelet off, strip the wires back to good metal, and add a new eyelet.
G110, G111, and G112 ground location and wiring diagrams
G110 G111 & G112 G111 G112
I just don’t want to do something and make it a bigger problem.
How do I apply 12 volts directly to the compressor? Do I need special cables?
You will need some smaller alligator clamp style test wires. Unplug the compressor wire, then carefully clamp each pin in the compressor connector and extend the wires to the battery. Then with the engine off initially, touch them to the battery posts briefly and confirm the clutch is clicking. Start the engine and repeat while watching the compressor to make sure the outer plate pulls in and spins with the pulley. If it does, only let it run for a little to see if it starts cooling the air.
<edit> As we've recently discovered from another thread, Patriots don't use a traditional pulley clutch, but instead a variable swash plate solenoid, but the test would be the same. Apply 12v to it to full send the compressor and you should still hear it clicking when engine is off. The wire is towards the back of the compressor.
<edit> As we've recently discovered from another thread, Patriots don't use a traditional pulley clutch, but instead a variable swash plate solenoid, but the test would be the same. Apply 12v to it to full send the compressor and you should still hear it clicking when engine is off. The wire is towards the back of the compressor.
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78 Posts
What about AC Fan not working. Checked fuses and 3 Relays. Nothing. Run 12v to fans and they will run. HELP please 07 Patriot 2.4
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12,339 Posts
Get a bi-directional scan tool like AlfaOBD, jscan, etc. that will let you turn the fans on and off (and other things too, like the A/C compressor duty cycle control / swash plate) through the CANBus.
Then you'll know if the fan driver circuit is working properly or if it needs repair, or if it's a problem with the inputs from the temp sensors, etc. causing the fans not to be turned on.
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78 Posts
Sandstone, thanks fir advice. Now this4" long plastic piece with screens on it is suppose to go inside of AC lines but cannot seem to find where the old one is located. Any Ideas? Thanks
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