Hi i have changed the head gasket on my vw polo and now it is overheating on every journey the fan doesnt seem to come on any ideas what it could be as i have put new temperature sensors and thermostat and nothing seems to be working!

Hi Marie.

Test if there is voltage to fan motor with engine hot (use a test light or a Voltmeter). If there is 12VDC to fan motor and motor does not turn, then the fan must be replaced. An alternative way to test the fan would be energizing the motor by connecting it to 12VDC. If fan does not run when motor is energized, then the fan is defective.

If fan does not get power fuse, fan relay, thermostat and wiring must be tested. If you have already replaced thermostat, test the rest.

Check the fan fuse first. Most VW use a 30 Amp fuse located in the fuse plate. Refer to the car owners manual for fuse location. Depending on the year of your Polo there is a Coolant Fan Control Relay on the main relay panel. If the relay is good it must power the fan when the engine is hot. Before going for the relay check that two of the relay's contacts are getting power. If there is no power to the relay and fuse is good it means that there is a wiring problem.

Regards.

Ginko

Just changed head gasket and temp was fine untill i put it all back togeher i have bled the water system changed to rad but still over heating wot could be the problem cheers for taking time to reply.