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1997 Ford Taurus Repair Question


Topics covered: Cooling fan, Click, Engine.
Mileage: No information provided.

Asked on March 16, 2008

1997 Ford Taurus Cooling fans do not come on with A/C switc


I am trying to debug an A/C issue and need some input. 97 Taurus with 114000 miles. A/C has alway been stable until recently when compressor froze up. I replaced Accumulator, Compressor, Orifice, oil and freon. After recharge I noticed that Radiator Cooling fans did not immediately engage when A/C switch was turned on. I checked my 98 Taurus and Fans came on instantly.
Goes like this....
Turn on A/C, no fans. A/C begins cooling and pressure rises on high side, low side goes down as expected. High side continues to climb until 350 psi when compressor shuts off and the cooling fans come on. At about 100 psi COmpressor turns back on and fans are still on keeping pressure at 150 psi. Then fans turn off and pressure rises back to 350 psi where cycle strats all over again.
What I know... I think A/C high pressure switch is fine (replaced anyway) and A/C clutch switch is good. I am not sure about the CCRM (Constant Control Relay Module).
Assumption... I do beleive cooling fans should engage immediately when compressor turns on. SOme I am thing CCRM or fuse or???

Anyone know of any test I can run to help find out why fans do not come on with A/C switch?
Avatar Asked by Zue

Answer

Replied on March 16, 2008

Probably going to be looking at the CCRM conncetor, for burnt or bent or pushed out pins, and burnt wires...


http://www.2carpros.com/forum/automotive_pictures/62217_CCRMa_1.jpg


You might want to click on the link in my sig file, there are 85 steps in diagnosing the fans, and CCRM and PCM...

Tiny Answered by merlin2021 (expert)
18,145 answers provided
Replied on March 17, 2008

Thanks Merlin2021 for responding. I am not sure of your suggestion to click on link in your sig for additional help becuase what I am directed to is some manuals that are for fee. Is this what you meant?
I have a Chilton's but is does not go into diags for CCRM and PCM. I did inspect CCRM and did not find any visible issues with wiring and pins. I do think it might be the PCM since relays are turning on fan when engine is hot, just not fans when the AC is tunred on.
:? If else have any suggestion fell free to add your two cents....

Tiny Response from Zue
8 questions asked
Replied on March 18, 2008

First thing is make sure the ECT which is the engine coolant temp sensor is in range, then check this info out


http://www.2carpros.com/forum/automotive_pictures/62217_ac1_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_ac2_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_ac3_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_ac4_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_ac5_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_ac5_2.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_ac6_1.jpg

Tiny Answered by merlin2021 (expert)
18,145 answers provided

Replied on April 2, 2009

CCRM (Constant Control Relay Module) was faulty and had to be replaced.

Tiny Response from Zue
8 questions asked
Replied on April 3, 2009

All set now?

Tiny Answered by merlin2021 (expert)
18,145 answers provided
Replied on December 5, 2010

CCRM was replaced with one from Ebay and all is good now!

Tiny Response from Zue
8 questions asked