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2003 ford explorer a/c clutch will not engage


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redrobin713
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Aug 10, 2008, 11:02 PM

Post #1 of 5 (2971 views)
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2003 ford explorer xlt 4x4 4.0 ltr v6 a/c clutch will not engage. I have checked the fuses that i could find.I don't know if i am missing one or not. I have checked the pressure switches using a jumper and that did not work either. It will kick in using a jumper wire. It is full of freon. It is a duel system.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 11, 2008, 3:24 AM

Post #2 of 5 (2968 views)
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Re: 2003 ford explorer a/c clutch will not engage [In reply to] Sign In

A/C relay likely - think it's underhood. Don't be jumpering high pressure switch as you can blow the puter and kill the vehicle!

What is your static pressure and why do you think or know it's full of refrigerant?

T
_________________________________________
Long retired now


redrobin713
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Aug 11, 2008, 7:42 PM

Post #3 of 5 (2958 views)
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Re: 2003 ford explorer a/c clutch will not engage [In reply to] Sign In

A friend has A/C gauges and Knows how to use them. I changed the relay and no change.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 11, 2008, 9:15 PM

Post #4 of 5 (2952 views)
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Re: 2003 ford explorer a/c clutch will not engage [In reply to] Sign In

Ok: Save the relay as it fits other locations and is a good test tool. Static pressure is all you may have now and that need to be roughly the same as the air temp psi = temp in Fahrenheit. When too full it would read the same and when under by a smidge system would shut down - that just static pressure info.

Operating pressures require compressor to engage otherwise there's no way to know how much gas is in the system and that only tells of performance not that it is full which is why I asked. Full is only known when filled from empty by weight - period.

You can jump an operative system with a low charge at its low pressure cut out switch (LPCO) for just enough time to take readings or charge a system. System will also shut down with excessive temp pressure conditions noted by a perhaps 3 wire high pressure switch which is connected to the car's computer. Jumping it can disable the computer's ability to restart the system or kill the car. That can be a costly test and avoided.

Quite surely there's no voltage available to engage the compressor at all at the moment. If this particular system has sensed low static pressure vs the temp it can and will shut down A/C forever till reset in some sytems - this exact one I don't know but a static pressure reading is mandatory to begin diagnosis. Again - if it's 75F ambient temp the pressure should read 75-80 psi or higher if catching engine heat. If you see perhaps 50 psi and know it's at least 75F it's empty. Need to know at least that # to continue,

T

T
_________________________________________
Long retired now


redrobin713
New User

Aug 12, 2008, 1:16 PM

Post #5 of 5 (2942 views)
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Re: 2003 ford explorer a/c clutch will not engage [In reply to] Sign In

Ok, thank you. Iwill try to get that # for you.




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