Question about 1998 Ford Mustang

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My radiator blew yesterday i replaced it but my fan wont turn on i relapaced my temperature sensor what can cause my radiator fan not to turn on

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The relay ,the fan itself or the circuit. Somertimes not often but sometimes the ECU.

Posted on Jun 02, 2010

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Big white fan connected or near radiator not working causing my temperature guage to slowly rise while im driving the car. i then switch my air-con on while driving slowly temperature goes down


That's the radiator fan malfunctioning. Check the fan motor itself by conecting direct to battery while disconected from harness. If not OK replace. If OK check the fan switches, These are sensors that turn the fan on when temperature rises. If bad replace.

Oct 05, 2012 | Cars & Trucks

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Engine cooling fan only works when ac or defrost is on


if engine at long stand still,the engine temperature will rise about 190 degrees the cooling fan suppose to automaticaly turn on when coolant temperature sensor get hot it cause its resistance decrease causing pcm to send power to coolant fan relays and cooling fans, when you turn on AC the cooling fans suppose to turn on to cool down AC CONDENSOR, IF NOT AC WONT WORK COOLING FAN COOLS DOWN REFRIGERANT SO IT CAN RECYCLE THROUGH THE SYSTEM AGAIN.your cooling is suppose to turn on when engine at a sit still if vechicle not moving as coolant temperature rises at a set point the cooling fans will turn on cool down engine.cooling fans dont turn on when you first cold stsrt vechicle unless you have AC SWITCH ON.if cooling fans dont turn on when vechicle at a long stand still or moving along slow traffic.if coolant temperature sensor been replaced and fuses and relays okay have dealership check see if pcm driver circuit working faulty pcm will cause cooling fans not to turn on.

Sep 27, 2012 | 1996 Buick Century

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

2 Answers

What could be making the radiator fans in my 2000 Alero stop working? We just replaced the old one yesterday and the fans worked great and then they stopped working again tonight. We checked the fuses...


the temperature sensor is next to thermostat housing disconnect the sensor and start the car if the fan works right away you have a faulty sensor also make sure there is good ground to the body and engine

May 30, 2011 | Oldsmobile Alero Cars & Trucks

1 Answer

I have a 1997 camaro z28 lt1 why is my radiator fan not working i see my temp gauge is already at the red zone but still the fan is not working i replace the following items which involved this...


ok eric. go purchase you a test lite and i will walk you through this repair, its not a big deal, dont throw anymore more money at this car. let me know if you have a test light and if you still need help.

May 05, 2011 | Chevrolet Camaro Cars & Trucks

1 Answer

2001 town&country had replaced radiator but now fan stop working van is not over heating and heat is good hanve no other problem just fan s not working olease help me to find out waht could be problem


ANY TIME YOU CHANGE RADIATOR ONCE YOU GET THE NEW RADIATOR IN PLACE.FILL RADIATOR WITH ANTIFREEZE CRANK VECHICLE UNTIL THERMOSTAT OPEN. WHEN YOU TOUCH THE TOP RADIATOR HOSE.IF TOP HOSE HOT THERMOSTAT OPEN.CHECK RADIATOR COOLANT LEVEL IF DROPPED ANY.ADD COOLANT UNTIL LEVEL QUIT DROPPING. WHEN COOLANT LEVEL QUIT DROPPING YOUR COOLANT LEVEL IS CORRECT. NO MORE AIR IN COOLANT SYSTEM OR AROUND COOLANT TEMPERATURE SENSOR COOLANT FAN SHOULD TURN ON ONCE ENGINE GET TO CERTAIN COOLANT TEMPERATURE.SEE IF COOLANT TOO LOW NOT ENOUGH COOLANT REACH COOLANT TEMPERATURE SENSOR. SENSOR CANT TURN ON FANS IF ITS NOT IN HOT COOLANT. WHICH DECREASE ITS RESISTANCE WHICH CLOSE OR GROUND CIRCUIT CAUSING COOLING FANS TURN ON.

Nov 25, 2010 | Chrysler Town and Country Cars & Trucks

2 Answers

I have a 91 Dodge Caravan LE 3.3 liter V6 engine, The long story on what problems I have had with this car is as follows. The first thing that happened was I had a fusable ling burn out on the van, this I...


For first check the coolant level.If its low then it must be made full.If its full then check out for any kind of coolant leak.If the coolant is low or getting leaked from somewhere then the car will overheat.So get the ac pressure test done.At any local car garage they do ac pressure test.Doing this test will let you know that there is coolant leak or not.If there is coolant leak then that leak is the cause of overheat.But if there is no coolant leak and coolant level is also full.Then ignore coolant cause for overheat.Then other cause may be the thermostat ,thermostat allows coolant to circulate when the engine is warmed up and should be closed when the engine is cold so that the car can warm up faster. It's a fairly inexpensive part that's replaced easily, but when it fails, your car can overheat, causing costly engine damage.
To check if thermostat is faulty try this procedure:--
Warm up the car but don't let it overheat--don't let the thermostat gauge go into the red.Turn off the engine.Open the hood.Find the upper radiator hose. It's black, is made of rubber and is about 2 inches in diameter, with metal clamps on either end. The upper hose goes into the top of the radiator.Locate the lower radiator hose. It looks similar to the upper hose except that it attaches to the bottom part of the radiator.Touch each hose very carefully (they can be extremely hot). If the temperature gauge is indicating that the engine is warmed up but one hose is hot and the other is cold, the thermostat is probably stuck closed, and the coolant isn't circulating through the radiator.the thermostat is faulty is the case. If the thermostat checks out ok then it can be faulty temp sensor.Its also called coolant temperature sensor. The coolant temperature sensor is a thermistor ( a resistor which varies the value of its voltage output in accordance with temperature changes. ). The change in the resistance values will directly affect the voltage signal from the water thermosensor. As the sensor temperature decreases, the resistance values will increase. As the sensor temperature increases, the resistance values will decrease.
The coolant temperature sensor lets the engine control computer know what the engine temperature is by gathering information from the engine coolant temperature.
There are several ways to know if the coolant temperature sensor is malfunctioning, if the sensor is bad it will trigger a trouble code and the check engine light in the dashboard will come on, you can retrieve the engine code and see if it is related to the coolant temperature sensor, even if the engine control computer doesn't store a trouble code, there is another way to suspect a bad coolant temperature sensor : If your vehicle starts using more fuel than usual, starts having trouble starting when the engine reaches normal operating temperature or you notice black smoke coming out from the exhaust tail pipe, it is very likely that these symptoms are related to a bad coolant temperature sensor. A thermostat that is stuck closed will cause the engine to overheat. To test if thermostat is stuck in the closed position, place the thermostat in boiling water. If the thermostat doesn’t open, than the thermostat is defective and needs to be replaced.
Check the Engine Coolant Fan
Since the cooling fan pushes air through the radiator to cool the coolant, a fan that’s not working properly will cause an overheat condition.
  1. Electric Fan – If the vehicle is equipped with an electric cooling fan, check to see if the fan is working properly. Most electric fans will only operate when the coolant temperature reaches a certain degree. In many vehicles when the air conditioner is turned on, the electric fan automatically turns on. The most common cause of an electric fan failure is the fan motor, a controller module or a relay.
  2. Engine Driven Fans – Some vehicle have cooling fan driven off the front of the engine. If the clutch (between the fan and the engine) is bad it may slip. If the clutch slips it may not allow enough rotation on the fan to be affective and the clutch needs to be replaced.
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Jul 21, 2010 | Dodge Caravan Cars & Trucks

1 Answer

The condenser fan blew out and damaged my radiator on a 2005 civic ex. The car is over heating and as the temperature needle goes up the radiator fan does not move. It only moves if I put the air on and...


hi
1st u have to replace condenser fan and radiator assy , it will solve your problem , cause due to no coolant radiator fan is not working and cause of engine overheating a/c system got trip . replace both condenser fan and radiator and put new coolant. thanks.

Mar 29, 2010 | 2005 Honda Civic

1 Answer

Aux. Fan not comming on when hot or cold... Boils over. Blew out heater valve... REPLACED: New 3 Prong Fan Relay located by Rt. Sd. Batt. Radiator Relay ( its a 2 prong push in Radiator ). Checked for...


Replace your temperature sensor. There is a sensor specifically for the cooling fans that triggers the relays, and tells the fans to turn on/off. The relays won't energize unless it gets a signal from that sensor.

Oct 20, 2009 | 1993 Volvo 940

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