1999 Cadillac Deville fans wont work

CHARLES H

MEMBER
1999 CADILLAC DEVILLE
V8
2WD
AUTOMATIC
140,000 MILES

I have a code p1660 is the relays the cause of the problem and do I have to replace all three or is there a way to tell which one is bad

Thursday, August 26th, 2010 AT 7:02 PM

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Hi charles h, Welcome to 2carpros and TY for the donation

Could be the engine temperature gauge switch sender, coolant temperature sensor, relays and the computer.

Get A DVOM To check the relays you have to measure the coil side for resistances which is normally 60-80ohms and switch side would be infinite. If you have AC turn it On-is the AC condenser operating if not were back to relays and the computer-I doubt both fan motor is defective

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Thursday, August 26th, 2010 AT 7:15 PM

CHARLES H

MEMBER
3 POSTS

The temp guage is working when driving its in the middle but just sitting idle it rises about 20DEG. Where is the engine guage switch sender located? I tested the fans and they work.

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Thursday, August 26th, 2010 AT 9:56 PM

RASMATAZ