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
Aug 26, 2010 at 7:02 PM
1999 Cadillac Deville fans wont work
1999 CADILLAC DEVILLE
CHARLES H
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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
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
Aug 26, 2010 at 7:15 PM
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.
Aug 26, 2010 at 9:56 PM
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Test the coolant temperature sensor on right rear of engine below the EGR valve.
Aug 26, 2010 at 11:29 PM