Question about Mercury Tracer

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Radiator fan Where is temperature sensor on 1999 Mercury sensor. Radiator fan does not come on and engine gets hot. Tested fan motor it works. Also how do I ohm the fan relay to test

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  • Mercury Master
  • 22,095 Answers

Remove the relay and test it across the battery ,the two big connectoprs are the fan power supply and two smaller ones are the relay ,test the smaller one across the battery and see if it clicks ,if they click then test the big ones for continuety when the small ones are connected and gone click .Simple if all ok then test for power in the big connectors in the relay holder ,one of them should read a permanant 12v supply

Posted on Dec 27, 2013

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Posted on Jan 02, 2017

  • 373 Answers

SOURCE: 1994 2.2L toyota camry radiator fans do not work

Hi.....

The Normal Temperature Range to the Fan Start is: A/C ON 181 F.
A/C OFF 199 F. When the Engine Reach this Temperature the Fan should start.

OK. Do this simple test.
1---- Start the engine, Desconnect the ECT Switch located on the Radiator,
See if the Fan come ON. If yes, if not go to step #2
Connect the ECT SWITCH and leave the car Running and with a Temperature gage.
See the temperature, if the Temperature go more than 199 F.
Turn the Engine OFF.
Disconnect the ECT sensor and check for Ground at the WHITE/BLACK wire.
If ground exist, Replace the ECT switch.
But if not. Check the wire for any damaged, and the ground at the Front Left Fender.
Repair as need.

2---- check the Fuse link RDI FAN . 30 amp.
Check the Fuse link CDS FAN 30 amp.
Replace if need.
And Return to step # 1.
Check the Radiator fan Relay, Rad fan relay 2 and 3. Replace if need.

Ok. I hope this help on your question.
I can give to you the WIRING DIAGRAM of the Fans, But I need a E-MAIL adress to do that.

Thank you for use fixya....

Posted on Sep 25, 2008

egoboss187
  • 53 Answers

SOURCE: running hot

replace the therostat ( most likely )

and the radiator cap

Posted on Nov 30, 2008

leetamara
  • 702 Answers

SOURCE: Cooling fan wont work

The water temp sensor is located near the thermostat housing. This sensor is what tells the ECM to turn the fan on/off. The water temp sending unit is located near the same area. You know you have the correct sensor is because the water temp sensor has a 2 prong plug. The water temp sending unit only has 1 prong.

Posted on Sep 27, 2008

  • 1 Answer

SOURCE: electric radiator fan won't come on when engine gets hot

I had the same problem. Check the fans relay behind the front grill, in front of the radiator, more accesible if you take the headlight (driver's side) out.

Posted on Jan 26, 2009

  • 7 Answers

SOURCE: electric radiator fan won't come on when engine gets hot

By pass it. remove wires from fan leaving enough wire to splice onto.Run 2 wires 1 to ground and 1 to a power source in fuse panel that only has power when ignition is on such as running lights . this by passes fuses and relays and assures your fan is running if your vehicle is running.

Posted on Apr 21, 2009

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How do I solve overheating?


First, find the problem.
When the engine is running, whenever it reaches the temperature of the thermostat, that thermostat is supposed to open, allowing the hot coolant to flow to the radiator, to maintain proper engine temperature.
The thermostat could be stuck closed, needing replacement.
Whenever the engine gets warm, there is also an electric fan in front of the radiator, to cool the hot coolant in the radiator.
This fan works off a sensor that is ******* into the engine block (whose function is to read the engine temperature) and sends an electric signal to the electric fan to start when needed.
The sensor could be bad, the fan motor could be bad, and there is a relay in the system that could be bad also.
God bless your efforts.

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My 2007 dodge nitro 3.7 only over heats when idle..is it that I have a bad radiator


No rad fine check the fan is working ,either the fan motor ?? connection to the fan motor ?? fuse ?? relay?? or temperature sensor?? any one of these will cause the fault

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Temperature gauge rises, coolant is not leaking? and have full tank of it. "Low Trac" light always comes on, then the anti-lock and "track off" light comes on and stays on until my car...


IF COOLANT TEMPERATURE RISING,CHECK TOP RADIATOR HOSE IF TOP RADIATOR HOSE IS NOT HOT REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.IF ALL IS GOOD.IF CAR OVERHEAT WHILE SITTING IN A LONG TRAFFIC LINE.THE COOLING FANS NOT WORKING,CHECK COOLANT FANS FUSE AND RELAYS.IF BOTH IS GOOD.HOT WIRE TO SEE IF COOLANT FAN TURNS ON IF NO FAN MOTOR BAD.IF YES FAN MOTOR GOOD. PROBLEM COULD BE FAULTY COOLING FAN WIRING OR BAD ENGINE COOLANT TEMPERATURE SENSOR BAD OR FAULT IN THE PCM.

Sep 12, 2011 | 1999 Oldsmobile Alero

1 Answer

Radiator fan switch or coolant temp sensor however it is called is not activating the radiator fan when temperature is high. . .iS THERE a way to by pass this switch or sensor so it can activate the...


CHECK COOLING FAN FUSE AND RELAY.IF ALL IS GOOD.HOT WIRE COOLING FAN TO MAKE SURE COOLING FAN MOTOR IS WORKING. IF COOLING FAN RUNS WHEN YOU HOT WIRE FAN MOTOR.CODE SCAN FOR ECM FAULT CODES.REPLACE THE ENGINE COOLANT TEMPERATURE SENSOR NO NEED TO BYPASS THE SENSOR.

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1 Answer

Overheating


OVERHEATING CAN BE CAUSE BY MANY THINGS LIKE FAULTY THERMOSTAT AND FAULTY RADIATOR PRESSURE CAP,TOO MUCH WATER IN COOLANT SYSTEM NEED 50 / 50 WATER AND ANTIFREEZE.LOOK FOR WATER PUMP WEEP HOLE LEAK, IF COOLANT LEAKING OUT WEEP HOLE WATER PUMP BAD NEED REPLACING.CHECK FOR LOW COOLANT LEVEL, YOUR RADIATOR OVERFLOW JUG SHOULD HAVE COOLANT AT THE FULL COLD MARK IF NOT KEEP ADDING COOLANT INTO COOLANT OVERFLOW JUG UNTIL COOLANT STOP DROPPING AND FULL COLD MARK, IF OVERFLOW COOLANT JUG WAS EMPTY RADIATOR IS LOW ON COOLANT.WHICH CAUSE AIR IN COOLANT SYSTEM KEEPING THE ENGINE COOLANT TEMPERATURE SENSOR FROM BEING SUBMERGE IN HOT COOLANT WHICH TURN ON THE COOLANT FANS.WHEN ENGINE COOLANT TEMPERATURE GET CERTAIN SET TEMPERATURE LIKE 190 DEGREES THE PCM AND COOLANT SENSOR WILL TURN ON COOLANT FANS, IF VECHICLE OVERHEATING COOLANT FANS NOT WORKING EITHER YOU HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR CHECK COOLANT FANS FUSE AND RELAYS. YOU CAN CODE SCAN CAR TO SEE IF YOU HAVE FAULTY PCM, FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR FAULTY COOLANT FAN RELAY.IF COOLANT FAN AND ENGINE COOLANT TEMPERATURE SENSOR OKAY,YOU HAVE CORRECT COOLANT LEVEL IN COOLANT SYSTEM, THERMOSTAT AND RADIATOR PRESSURE CAP BEEN REPLACED, YOU COULD HAVE BLOWN HEAD GASKET CHECK ENGINE OIL LOOKS LIKE MILK SHAKE HEAD GASKET BLOWED ALSO WHEN HEAD GASKET BLOWED YOU CAN DRIVE CAR SHORT DISTANCE START OVERHEATING AND YOU LOOSE ENGINE POWER SUSPECT BLOWED HEAD GASKET.

Aug 04, 2011 | 1999 Oldsmobile Alero

1 Answer

Overheating


CAR OVERHEATING FIRST CHECK FOR LOW COOLANT IN THE RADIATOR COOLANT OVERFLOW JUG.IF COOLANT LEVEL IN OVERFLOW JUG LOW REFILL ADD COOLANT BACK TO THE FULL COLD MARK.PUT RADAITOR CAP ON COOLANT OVERFLOW JUG START ENGINE LET IT IDLE UNTIL IT OPERATING TEMPERATURE.MAKE SURE TOP RADIATOR HOSE GETTING HOT WHILE ENGINE WARM UP.IF TOP RADIATOR HOSE DONT GET HOT WHILE ENGINE IDLING YOUR THERMOSTAT COULD BE STUCK CLOSE CAUSING CAR TO OVERHEAT.IF TOP HOSE IS GETTING HOT.CHECK FOR COOLANT LEAKS CHECK TOP RADIATOR HOSE AND BOTTOM RADIATOR HOSE FOR LEAKS.CHECK FOR LEAKS AT THE RADIATOR CORES AND PLASTIC SIDE CONTAINERS.IF ALL IS GOOD ENGINE OVERHEATING WHILE IN A LONG TRAFFIC LINE, COOLANT FANS NOT COMING ON.COULD HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR BLOWN COOLING FAN FUSE OR RELAY.COULD HAVE PCM FAULT.MAKE COOLING FAN ELECTRICAL CONNECTORS AND WIRING NOT DAMAGE OR BROKEN.

Jul 17, 2011 | 1999 Oldsmobile Alero

1 Answer

Hi: I read your answer to the problem with the 1999 Mercury Mistique temperature gauge. I'm having a similar problem. My temperature gauge is broken in the cold position. And, as far as I can tell,...


Very correct the ECT is a 2 wire thermistor,when coolant temp increases, the resistance andsignal voltage decrease,If you disconnect the sensor the fan goes on, you just trouble shooted the vehicle cooling fan switch, If anything the signal to the gauge itself may be non-op and not getting to the indicator, try this with vehicle at warm up temperature if you turn the A/C does the fan turn on.it should if it doesnt the power juction box (fuse and relay in engine compartment should be checked, for any opeen fuses, By the way the guage information is from the PCM

May 04, 2011 | Mercury Mystique Cars & Trucks

1 Answer

I have oldsmobile alero 1999, problem is that the engineer idles after running for an hour or when engine is getting hot


SOUND LIKE ENGINE COOLANT FANS NOT RUNNING.CHECK TO SEE IF COOLANT FANS RUNNING WHEN ENGINE START OVERHEATING.IF NO CHECK COOLANT FANS FUSE AND RELAYS.IF ALL IS GOOD.HOTWIRE COOLANT FANS TO MAKE SURE THEY ARE WORKING.IF NO REPLACE FAN MOTOR.IF FAN RUN WHEN YOU HOT WIRE IT.THE COOLANT TEMPERATURE SENSOR FAULTY ARE THE PCM FAULTY YOU CAN USE A SCANNER TO CHECK THEM FOR FAULT CODE.IF EVERYTHING GOOD SO FAR.REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP FLUSH ENGINE BLOCK AND RADIATOR.CHECK RADIATOR AND CONDENSOR AIR CORES MAKE THEY NOT STOPPED UP WITH LEAVES AND OTHER DEBRIS THAT WILL BLOCK OFF AIR FLOW THROUGH THE FRONT GRILLE RADIATOR CORES.ALSO CHECK WATER PUMP WEEP HOLE IF ITS LEAKING WATER PUMP NEEDS REPLACING.

Nov 05, 2010 | 1999 Oldsmobile Alero

1 Answer

Where is the radiator fan sensor on a 1999 toyota cturcel?


There is no radiator fan sensor, the fan is controlled on and off from the cars ECM (computer) which takes the reading from the engine's temperature sensor. If you think you have radiator fan issues, check your fuses under the hood and the relay fan to your radiator, once you have determined that there in good working order, move on to inspecting for a bad wire harness to the radiator fan but take caution to the fan turning on hot engine parts if your going to have the engine running.
Turning on the A/C with the engine running should also turn the fans o, if they don't come on then inspect your fuses as mentioned above and relays.
Thank you for using fixya and be safe.

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