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@byjoshuawilliams find the fan thermostat switch on the radiator and bridge the wiring to see if the fan runs, then if that is OK make sure that part of the radiator is getting hot, thermostat opening/rad blocked etc. Fan switches are very common on VW's I used to fit loads of them when I worked at VW/Audi before my BMW days.
Fixedwheelnut-
Hate changing switches after I have damaged radiators, both plastic and metal, trying to remove them.
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How long should I expect to run the car before the rad gets for? Ran out for 10 minutes or so on the drive and red didn't really feel hot. Found out mechanic had changed the radiator switch ( presume he means thermo switch) so I'm thinking read must be blocked. Fab and wiring is working
lynx
Jw89
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.