I recently bought an 03 Jetta. Seems to be OK apart from 2 issues which maybe linked.
Cabin heat doesn’t work. The dealer claimed they had fitted a new heater core, they seemed equally incompetent as they were dishonest.
Radiator fan doesn’t seem to work. The car seems to warm up at a red light and cool again when moving. Temp gauge is right in the middle while driving, goes 2/3 way to the hot side and seems to go back down. Haven’t seen the fan turning when I checked under the hood with the temp gauge in the middle.
So, a couple of questions here
At what temp on the gauge should the fan kick in ? Maybe it just wasn’t hot enough yet.
Any chance the two problems are related, or am I barking up the wrong tree ?
Might the thermostat be a good place to start ?