high speed fan not coming on?

HISSIN50 · Nov 23, 2010

5.0_GT_kid said:
Hissin, can you provide some more info on testing the CCRM? I'm looking at this schematic but don't see a pin 13.

94-95 Mustangs Electrical CCRM - Mustang-Tech

5.0_GT_kid · Nov 23, 2010

Thanks Hissin.

We did some of the CCRM testing and have constant 12 volts at pins 3 and 4. What's real interesting is that when we pulled the CCRM out and jiggled it, you can hear something of decent size rattling around in there. Is it possible that relay worked itself loose and is also responsible for some of the other electrical issues in the car?

5.0_GT_kid · Nov 24, 2010

Is it possible to open up the CCRM and replace the relay? I've heard secondhand that people have done that.

Chythar · Nov 24, 2010

You can open the CCRM, just drill out the rivets on the corners. Replacing the relay, depends if you can find a replacement and can do some soldering. They're not designed to be replaced, just the whole unit.

HISSIN50 · Nov 24, 2010

Pins 3 and 4 are just battery feed to the common terminals for the EDF/HEDF relays. Gotta test the other stuff to see what's going on.

As noted, it sounds like a relay coil might have broken. If you narrow down which relay [coil] is acting up (based upon relay behavior), you could also just wire in a SPST/SPDT stand-alone relay that would circumvent the problem relay.

94GTMustang5.0 · Nov 29, 2010

how much is it to replace the whole CCRM? would any junkyard cars possibly have it? I have heard ford windstars and escorts also use CCRMS.

I would rather just replace the whole unit, the corners of this one are rusted and im pretty sure its defective.

HISSIN50 · Nov 29, 2010

Cost will depend upon the seller.

I'd stick with a 94-95 GT CCRM.

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