no twelve volts anywhere for A/C

1997 FORD THUNDERBIRD
135,982 MILES • 3.8L • V6 • 2WD • AUTOMATIC
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JYMIJAMZ
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  • 1 POST
I have no twelve volts at compressor or low pressure switch. fuse is good replace CCRM from dealer did not want used one) what am I missing that is causing this problem?
Jun 1, 2017 at 9:39 PM
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JIS001
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  • 3,412 POSTS
Have you checked refrigerant level? Have the system drained to measure how much Freon is in it and then charge it with the proper amount. If it is ok check the A/C clutch relay circuit for an open circuit. Also if you have a compatible scan tool see if you can see the actual command being sent to activate the compressor?

Also check the high pressure cut off since the circuit runs through there before going through the cycle switch. Let us know what you find.
Jun 4, 2017 at 2:21 PM
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JIS001
  • ✓Experienced Mechanic
  • 3,412 POSTS
Added some diagrams too.
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Jun 4, 2017 at 2:37 PM
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