Cooling fans dont engage! 1998 oldsmobile silhouette!
Cooling fans don't engage when a/c is turned on or when temp reaches 200 degrees plus. I jumped fans from battery, and they work. Check all fan relays, and their all good. Both 30 amp fuses are good. So i can only think there is a thermostat on the radiator or on one of the fans that has gone bad. where can i find them or a diagram that shows them and location. Iam just assuming at this point but there has to be a thermostat somewhere to turn the fans on and off. please help thanks! Oh and i also replaced a sensor on the thermostat housing, and it didnt help! Sigh's
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Re: cooling fans dont engage! 1998 oldsmobile silhouette!
Your Problem Can VERY WELL BE with the Temp Sensor, As It Is the First in This Electrucal Circut . it Waits for 210-230 Degree Engine temp and Gives that Sygnal to the ECM then ECM Grounds out the Cooling FAN RELAY To Turn ON the FANS and the Temp Sensor is Usualy THE #1 Culpret Closley in front of the RELAY.
There are 2 Sensors On this Vehicle The One You Replaced and One Located At Trans Side of
Engine Closer to Front of Vehicle At the Head ,Thereis a 2 wire Plug On it and This Sensor Goes to the ECT witch CONTROLS COOLING FAN RELAY. Hope this Helps and if you Need A Diagram For this It Must be Emailed as FixYa Does NOT Support Large Picture Files. My Email Add. Is MY
Screen Name Here on FixYa @aol.com
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Most cars temperatures are at around 225 degrees before the high speed fans turn on. And then it only reduces it to around 210. If your car is too hot, first you will hear the lifters pinging and tapping. Then you may hear some rod knock. After that your car will just shut down. Too late then.
Can you jumper the relay to make the fans run ? The computer sends a ground to the relay to power the fans when the coolant temp reaches 220 degrees or when the ac pressure reaches 200 psi on the high side.
completely normal those readings are perfect this car comes with a 195 degree thermostat,210 is fine for stop a go traffic remember a cooling system with the proper amount of coolant in it and under pressure will not overheat till about 240 degrees your in great shape no conerns!!!!!...
I have the same car. The cooling fan activates at 227F. Only one fan will engage at this temp, the other one[closer to the A/C compressor] won't engage unless the A/C is working. Try charging the system with half a can of refrig. It'll be tough retrofitting to R-134A, the LOW PRESSURE connector is under the air box pointing sideways about an inch from a large bracket. Try and find a 90 degree adapter of some type and go from there.
The cooling fan does not come on until the engine temp reaches 229 degrees. it is controlled by a cooling fan relay. Cheeck for power at the fan motor and check the relay. The A/C. If yuor a/c system is low on freon the low pressure switch on the accumulator will not complete the circuit for the clutch. Check the charge, voltage present at the clutch or the low pressure switch. You can install a jumper in place of the switch to test.
check the relay that controls it it should be located under the back seat or posibly in the trunk. do u have the owners manual? look in thair first it will tell you exactly where it is. also try disconecting the temp sensor and see if the fans kick on then if not replace relay.