Radiator fan (low and high speed) not turning on?

Sorry, I attached the wrong picture. This is the correct one.

Hi Boris,

I went back to the first step you posted using image1 and image2 for testing again. I have replaced my PCM and CCRM (exact same models like my original ones) from eBay. I have constant 12V at pin 3&4 of the CCRM.I have 12V at pin 13 CCRM with ignition on. I have solid Ground at pin 15 CCRM and my radiator fan connector. I have continuity on pink/white and red/black between PCM to CCRM(pin 45 PCM to pin 14 CCRM, pin 17 PCM to pin 17 CCRM). However, with ignition on, I can't turn on Low/High speed fans by connecting Ground to pin 14 or pin 17 of the CCRM. With ignition on and A/C switch set to on, I was getting 12V at the orange wire at the AC low pressure switch, but there's no 12V at the Green/Red wire next to it. In order to get 12V to this wire, does the AC compressor(clutch) has to be engaged and spinning? Another discrepancy that I found was: this green/red wire which goes to pin 41 of the PCM, but the wire at my PCM pin 41 was white (which was working before). Can you give me more guidance? Thank you.

Hi Ken or Boris,

I have replaced my PCM and CCRM (exact same models like my original ones) from eBay and I'm getting the same results (fans not working). On checking the wiring, voltage and ground, everything checked out except the green/red wire at the A/C low pressure switch. This wire should go to PCM pin 41(image1), but the wire at my PCM pin 41 is white instead?And I looked at the PCM connector(104 pins) and couldn't find any green/red wire? I don't know where that wire goes from the ac low pressure switch to. But whatever it is, this setup was from the factory and working before. Can anyone of you give me some more guidance? Thanks.

Hi Boris,

The green/red wire between the AC Low and High switch was tested good in continuity. The White wire between the PCM and AC High pressure switch was good as well. I also have Ground at the Black/Yellow wire at the AC High pressure switch. The green/black wire between the PCM and AC High pressure switch was good too. I also used an electrical contact cleaner to clean the connectors before I plugged them back. The rest of the wiring between PCM and CCRM I've already tested 2 to 3 times already. After testing, I reconnected the battery and started the car and my fans are still not working. I'm pretty sure this is not a wiring problem anymore. The PCM and CCRM are the OEM units I bought at eBay which are supposed to be good, and they both behave like my original units. Could this be the CCRM 'solid state relay? I read online that a Ford mechanic mentioned that the ECT sensor is a Sensor, not a switch. If we short the 2 pins to turn on the radiator fan, it will damage the PCM. But I've already replaced the PCM and it's still the same. I've used boiling water to test my original sensor and it was within Ford specs and I installed it back on my car. Any new ideas?

On applying Ground to pin 14 and 17 with ignition ON, I tried that on all the CCRM's I bought and none worked.I don't think ALL of them can be bad(same symptom).I don't know what else I should try. Do you know how to test the ECT sensor voltages on the car with engine running?

If I use image1, connecting a Ground to pin 17 of CCRM with ignition ON, I should be able to turn on the High-speed fan because it doesn't go through the solid state anyway, but I can't. This is strange and all 3 CCRM's behave the same.

I've tried just about everything on this car and nothing will turn on my fans.