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Tested both fan and wiring from thermoswitch to fan and both work fine. So presumably it's either the thermoswitch or a blocked rad. I can't see how either of these would cause the issues with the coolant pressure than. Are we saying it's two separate issues? Might as well get the thermostat out now and check that.
Jw89
lynx
Hello,
So the guage went high and no fan cut in.
Mechanic sounds like an utter cnut for not telling you or fixing the issue even after getting the car back to replace the water pump.
I'd check that the fan motor still turns, with the ignition off, so you can see if its free and not seized. Then if it free look at the thermoswitch. Looking at the photos here the thermoswitch is at the opposite of the water pipes, unplug the connecter and short the two terminals with a cable and see if the fan operates. If the fan operates then the thermoswitch has failed. If nothing happens so check the fuse isn't blown.