A/C not cooling

1997 LINCOLN TOWN CAR
115,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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JACK LANCE
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  • 4 POSTS
A/C not cooling. I did jump relay and A/C system came on. There is no power at pin 30 at the relay to turn the A/C clutch on. I jumped the A/C clutch cycling pressure switch by unplugging the switch and shorted the wires together, but that did nothing. It seems like a fuse, but I cannot find a blown fuse. Do you know which fuses should be checked. No twelve volts at A/C cutout relay.
May 15, 2018 at 11:40 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
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Good afternoon.

The power for pin 30 comes from the high side pressure switch. You need to verify voltage at the high side pressure switch.

Roy
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May 16, 2018 at 2:24 AM
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JACK LANCE
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Thanks for the information. My Haynes manual did not have that diagram. I did find the high pressure switch, but had no power there or at the low pressure switch or pin 30. Any guidance would be helpful.
May 16, 2018 at 11:48 PM
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ASEMASTER6371
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It is fed from the control head to the clutch cycling switch and then to the high side pressure switch.

Diagram attached.

Roy
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May 16, 2018 at 11:57 PM
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JACK LANCE
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Thank you for your help. I have fixed the control head. http://www.lincolnsonline.com/tech/00261.html. At this website I soldered the exact pin on the circuit board they show in the picture, which is a pin of a relay on that board. Very easy. reassembled and the A/C began working again. It has been working fine for several days now. Very interesting and simple fix.
May 30, 2018 at 1:19 AM
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ASEMASTER6371
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Good find. Amazing what the system does when it has power.

Roy
May 30, 2018 at 1:26 AM
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JACK LANCE
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The hyperlink does not take you directly to the page as it should, but if people look under the ( 5 TC EATC Module repair link) the page appears and there are pictures. My 1997 EATC module was made the same. It de-solders itself from the heat going through the power side of the relay over time.
May 30, 2018 at 4:38 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good information. Thank you.

Roy
May 30, 2018 at 4:41 AM
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