possibly reversed wiring or perhaps a bad PCM, the PCM is supposed to override the sensor and turn on the fan anytime the AC is on.
believe it is in power distribution box along with other relays and fuses. it is activated by the engine coolant temperature sensor.
On a 1998 Mercury Tracer, the cooling fan relays are located in an engine compartment box. The compartment box should be labeled 'Cooling Fan 40 amp.'
the fans are operated by means of a series of relays which are turned on or off by the engine computer. the engine coolant temp sensor that sends its signal to the engine computer is what indirectly turns on the fans. if there is no check engine light for a coolant temp. sensor code, the problem lies in the fans themselves, or the relays and related wiring.
Moniters the engine coolant temparature and relays that info to the ECM.
If you have replaced the relays in your 1997 Toyota RAV 4, the engine cooling fan may not come on when it is supposed to because of a failure in the wiring, the thermostat that sends to the fan, or the fuse for the cooling system.
Yes. Cooling fan, engine fan, and radiator fan relays are all the same thing.
The coolant temperature sensor on a 1997 Lincoln Continental is located on top of the engine, near the upper radiator hose. It constantly relays the engine's temperature to the computer.
I own a 2000 with cooling fan probs check your coolant temp sensor,changed mine and cooling fans work perfect bhasche@yahoo.com
Engine Cooling Fan Fuses/Relays1995-1998 Engine compartment fusebox # B & H1999-2003 Engine compartment fusebox - Fuse #107 and relays #301 & 303The engine coolant temperature (ECT) sensor is threaded into the top left-side of the engine, in the intake manifold (right behind the oil filler cap.)The steps to replacing are:Partially drain the engine cooling system until the coolant level is below the ECT sensor mounting hole.Disconnect the negative battery cable.Disconnect the wiring harness from the ECT sensor.Remove the coolant temperature sensor from the intake manifold.To install:Coat the sensor threads with Teflon® sealant.Install the sensor into the intake manifold and torque to 71-115 inch lbsConnect the negative battery cable.Refill the engine cooling system.Start the engine and check for coolant leaks. Top off the cooling systemIt should be located on or near the waterneck. The waterneck is where your thermostat is contained. It could also be tapped into your head (likely Bank 1, which is the side next to the firewall). If it is in the head you will likely find it on the end of the head. Remember to use a small amount of teflon tape on the threads of the new switch.it is under the intake manifold hose where it attaches to the throttle bodyThe engine fans are protected by relays in the engine compartment power / fusebox.See "Related Questions" below for more
The engine computer (PCM) operates the fans by opening and closing the ground for the fans. The PCM will command the low speed fan to come on when coolant temp exceeds 221 degrees.The fan should always come on whenever you turn on the A/C no matter the engine temperature.The fan will also operate with the engine off when the engine coolant temp is over 140 degrees.The PCM will ground all 3 engine coolant fan relays when the coolant temp is 235 degrees or the A/C pressure is too high and run the fans on high speed.
relays will be found on inerfenders or firewall
3 relays