Coolant Warning

[norwichbluenose]

Okay I think I know what the problem is, but I could be wrong.

When I have been driving for a bit and then stop, at traffic lights or road works for example, a warning light comes on saying check coolant level quickly followed by STOP immediately. Upon checking the coolant level it is fine and not boiling, my temp gauge does not move it stays on 90 degrees. Now I think the problem is my electric fan has packed up, because when I restart the car and start moving no problems and the problem only happens when stationary. My thinking is when the engine is idling there is no cool air going through the rad to cool the coolant down, therefore the temp rises a little bit, my fan doesn't kick in, the engine management senses a problem and thinks its over heating.

I have checked the fuse for the fan and its fine, does any one know how to check if the fan is working or not, or any other possible causes.

 

 

Andy B

[Chris Young]

To check the fan you could unplug the connector and put 12v through it, if it spins its okay.

There are two fans so i doubt both are caput. Check if wiring connector loose. Check for break in wires.

 

Other possible faults from the tis manual are..

 

The engine overheats (signs of coolant boiling)

 

Possible Source(s):

Air in system.

 

Action(s) to take:

BLEED the cooling system. For additional information, refer to

[Bigjeeze]

I have had exactly the same problem on my MK2 - usually after it was serviced. Check the coolant level sensor plug on the coolant tank - give it a wiggle and check the connections are good. Thats usually does it for mine.!!

[Smilge]

Although a conceivable problem and it appears that your system is not overheating, this looks like an indication snag. There should be a water temp sensor that will switch the fan on ....... try and locate it and unpug the electrical connector. Short the two pins using a piece of wire which will hopefully get the fan running. If it doesn't then its a good chance the fan's U/S. If it doesn't, then either the sensors U/S or wiring to/from the sensor could be open circuit. Hope this helps.

[norwichbluenose]

Okay, here is an update. My fans are fine both work, ( an easy test for this if you have air con switch it on the fans should go on automatic when low is selected on the air con). The coolant level is fine and running through the system okay. next job is to test the sensors as one of them could be us.

[johnswlondon]

i suspect you are getting the stop sign not because it is telling you the engine is overheating but because the sensor is misreading that there isnt enough coolant

[fedupwithjunk]