Sn95 guys!! My fan doesn't work correctly

BIGDATOWN · Apr 12, 2011

I have done everything I know to do. When you turn the a/c on, the fan will turn on to the low speed, other wise it will not run on by itself. When I unplug the sensor in the coolan rail, the fan turned on to the low setting then immediatly to the high speed bringing the temp down very quickly. I waited for the temp to get all the way to the A before I made the fan come on. Within a min it was all the way down the N. This car has a brand new radiator and a 160 stat in it. Please help me figure this out!

Pops Fun · Apr 12, 2011

This helped me last year!!

94-95 Mustangs Electrical CCRM - Mustang-Tech

Also take the connector off and check it .... a pin was burnt on mine. Ended up ordering a connecter, ccrm and a fan!! Didn't need the fan but it was a knee jerk reaction.

BIGDATOWN · Apr 12, 2011

How much is a ccrm? And can you replace the relays easily?

Dino Dino Bambino · Apr 12, 2011

BIGDATOWN said:
I have done everything I know to do. When you turn the a/c on, the fan will turn on to the low speed, other wise it will not run on by itself. When I unplug the sensor in the coolan rail, the fan turned on to the low setting then immediatly to the high speed bringing the temp down very quickly. I waited for the temp to get all the way to the A before I made the fan come on. Within a min it was all the way down the N. This car has a brand new radiator and a 160 stat in it. Please help me figure this out!

Sounds like it's the ECT sensor at fault so I'd change that first.

95ssn95 · Apr 12, 2011

I just replace my fan assembly, my car was build 12/94 and after 01/95 they changed something so i couldn't find just a motor that would work with my fan, bought the hole assembly. Anyway the fan motor was shot, it would run on low but not on high unless I giggled the wires going into the housing. No more problems.

BIGDATOWN · Apr 12, 2011

Sorry forgot to mention that also. replaced with a brand new unit. Zero change. Fan would not come on by itself.

HISSIN50 · Apr 12, 2011

Were any of the tests in the tech note performed?

You can also test the output voltage of the ECT to check its calibration.

BIGDATOWN · Apr 12, 2011

No. Mainly because I have no Idea which wire is which to test. I plan on taking the ect out of the rail and putting a lighter to it to see if that makes the fan turn on.

HISSIN50 · Apr 12, 2011

There are easier ways to test the ECT.

The CCRM wires are numbered.

99FiveOh · Apr 12, 2011

Yeah, the fact that your unplugging the ECT cycled the fan to high speed tells me that your ECT sensor is bad. They do go bad, so changing it is good preventative maintenance anyway. And much cheaper than a new CCRM. Besides, the CCRM is just a box full of relays so if you do anything else to the system and the fan kicks on, the CCRM did what it was supposed to do which is activate the fans when it is signaled to do so.

I don't think your CCRM is the problem here.

BIGDATOWN · Apr 13, 2011

Ok well I changed the ect for a brand new one. Still no luck

99FiveOh · Apr 13, 2011

Welcome to the POS that is the 94/95 Mustang 5.0! It's a labor of love my friend.

Sn95 guys!! My fan doesn't work correctly

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