Thread: 98 Deville non-functional engine cooler fan
View Single Post
  #2 (permalink)  
Old 07-05-08, 03:41 PM
submariner409's Avatar
submariner409 submariner409 is offline
If it won't run, chrome it.....
Cadillac(s): 2002 Cadillac F55 STS/53000mi., 2004 Ford F150 Super cab 4x4
View submariner409's Photo Album 		 
Join Date: Feb 2006
Location: Maryland upper Eastern Shore
Age: 69
Casino Cash: $20264
iTrader: (0)
Re: 98 Deville non-functional engine cooler fan
One or both cooling fans come on low speed at 224 degrees, high at 236. One fan will run slow in any mode that calls for the a/c compressor to run.

The engine is designed to run at 206-220 degrees: the thermostat starts at 188 and is fully open at 206, so the oil (if you have a radiator end tank "oil cooler") and coolant will always be at or above 200...always. 18 psi cap, 50/50 DEXCOOL is a boil point of 264.

You could double check the fan fuses in the engine room box.....2 fuses and maybe 2 relays, although the relays on a 98 may be down on the fan bracket. (....and it can take a long time for a fan to come on at idle.)