mustang temparture sensor


Old 03-03-05, 08:12 PM
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mustang temparture sensor

On my sons 1989 mustang 4 cyl the electric fan will not come on. The fan motor works if wired directly to the battery however I cannot locate a fuse listed for the fan in the fusepanel or a temp. sensor that may control the fan. Can anyone help?
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Old 03-03-05, 09:32 PM
Join Date: Dec 2001
Location: nc
Posts: 616
Its a fuse link, not a fuse that controls the fan. There are 4 of them that are attached to wires that go into the constant control relay module (CCRM). See the wiring diagram:
They should all have power at the point where they connect to the CCRM. The red and light green wire may only have power when the ignition it turned to ON.
Check each of these for 12V where they connect to the CCRM. It's impossible to tell from the diagram which one would be for the fan. If any don't have power, replace the fuse link. See this page for help on that:

If all have power, you may have a bad CCRM. Remove it and call a dealer to see if they can test it. Hopefully it's just a bad fuse link. Check the wires that go to the fan for a spot where insulation may have burned off and caused a short or you may have a fan problem.

Someone else here recenty had a similar problem in this thread:

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