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If there is a problem with the fan relay or temperature sending unit is the car ok to drive till I can get to the mechanic?

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That depends on a lot of things ... but the safe answer is NO, don't drive it! You could ruin the engine from overheating. What would THAT cost you?

Posted on May 12, 2017

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1 Answer

Cooling fan wont turn on


you are expecting the wrong temperature unit to control the fan. The temperature sender unit controls the temperature gauge and the temperature sensor unit controls the fan operation. It allows current to go to the ECM and when a pre set temperature is reached the ECM activates a relay and the fan starts . Two completely different units to do two different jobs so if it is doing what you say then there is a possibility that the wires are crossed or shorted.

Jun 20, 2014 | 1993 Dodge Spirit

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Car running hot


Check fan relay and wire connections; if they are ok, and the fan work if you jump directly, could be the temperature sending unit, engine temperature sensor out of range or thermostat stuck. Stop the car, could overheating and damage other components and engine itself.

Jun 21, 2012 | 1995 Cadillac DeVille

1 Answer

The car is over heating because the fan doesn't come on till after its hot


check for a blown fuse first, then check the relay (you can swap out another one with it to see if the relay is bad, like the ABS or a horn relay)-if they check out ok, run a wire from the battery positive post to the positive wire on the fan connector to see it the fan runs-if so, does your temperature gauge work? If not, it is the sender unit, if it does, you fan motor is probably bad.

Jun 07, 2011 | Ford Tempo Cars & Trucks

1 Answer

We have a 2004 X5 diesel , fan won't turn off even after key removed, have taken out 50amp fuse to stop it ! would apreciate a solution please


In these models the temperature control works till the normal temperature comes to the engine. So if there is failure of the temperature control sensors- Thermistor- or if there is fault on the temperature controller unit , the fan will be made to work on till the controller deactivates.
So you need to check for the input- temperature sensor, check any wires that had come off the sensor or the unit, check if the fan control contactor/relay has failed or jammed on contact.( relay).
Try and trace these lines , check the action of the relay when the fuse is put on, if you hear the relay clicking then it works and the control circuit can be the suspect.

Apr 15, 2011 | 2003 BMW 5 Series

2 Answers

Cooling fan quit running and i cant find relay


Relay may be ok, check the temperature sending unit that signals the relay to run the fan, it may just provide the ground for the cooling fan! Temperature sensor for the cooling fan circuit!

Sep 06, 2010 | 2006 Chrysler PT Cruiser

1 Answer

Whar is the temperature sending unit on a 1997


Will the fan come on if you turn on the AC. This will confirm the fan relay and the computer are ok. If it still does not come on then the problem is not the temp sensor. If the car never gets hot enough the fan will not come on on its own. This would indicate a stuck open thermostat. The temp sensor should be located next to the thermostat housing. Follow the big hose on top of the radiator.

May 06, 2010 | 1997 Oldsmobile Aurora

1 Answer

I have jeep gran cherokee laredo 2000 engine 4 liters my engine fan no work a i check direct my fan and work i chech the fuses is ok and relays to


Check your temperature sending unit. Here's how it works: sending unit sends a message to the computer telling it it's hot. Computer sends a ground signal to the relay that in turn completes the circuit to the fan. If the temp sender does not do that and the computer, fuse, relay and wiring are good, the fan won't come on.

Feb 13, 2010 | 2000 Jeep Grand Cherokee

1 Answer

Still want to shoot into a thermal runaway.


First of try to understand exactly what part you mention exactly how they work or function
  1. please place a new low speed relay as it try to make out thermal heating cool at it's initial 1st stage level of heating so that the temperature remain maintain if thus it reaches the second level of heating then the high speed relay act at that time & the speed of radiator fan increase to get thermal heating in control.
  2. the thermostat regulate the heating temperature of the engine it senses the temperature & signal to the relay the relay then react according to the temperature level of engine at low heating it operate the low speed relay & high temperature it signal to high speed relay so the engine temperature does not rise to extended level of heating or overheating.
  3. see for thermostat valve is failure if that so replace it new sometime most of the mechanic change it or cancel it so that the temperature does not rise as this thermostat help engine maintain it's ideal temperature which is required by the engine for regular or good working even at extreme climatic condition.
  4. Do check for every tensioner or Ideal Bearing as far consider on the No. of miles or Km the vehicle has run according to us the tensioner or ideal bearing are suppose to be replace at an interval of 30000 to 35000 Km. but this replacement include both Engine timing belt & tensioner & ideal tensioner bearing.
  5. A water pump flow depend on the tension of the drive belt some vehicle come with water pump which drive on inner timing belt tension & some on the fan belt or external tension belt of engine.
for further more FAQ do send in or place your problem we will sort it out till then have a safe drive & happy motoring from siddhanth.....!

Sep 29, 2009 | 2003 Chrysler PT Cruiser

1 Answer

I have a comlicated one


two things to check.... the sending unit and the relay for the fan.

I remember my dodge omni's fan didn't come on till near meltdown... but the temperature gauge never said it was that hot.

Dec 19, 2008 | 1999 Saturn SL

1 Answer

A.c. condenser fan


check the relay. if the relay is ok then check the thermostat temperature sensor and sending unit

Jul 18, 2008 | 1998 Audi A6

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