nicebutdim Posted September 11, 2010 Report Posted September 11, 2010 Hi all, couple of weeks ago my water pump went, didn't leak, it just decided to make as much noise as possible. Anyway, replaced it and the thermostat while it was out. Now the problem has begun; after the engine has been running for about 3-4 mins the fan comes on, and doesn't really go off until about 1-2 mins after the engine is switched off. If the ignition is switched on again, the fan will restart and keep running until turned off again. I thought firstly that the water pump or thermostat may be faulty, so I changed the stat (again) and checked the pump, all seemed fine. Refilled, problem still there. I then had a think and realised that the water isn't overheating, the gauge slowly makes its way to about the o on norm, and doesn't go much higher. The rad is warm as is the lower hose, so the pump and stat must be working fine. I pulled the wires from the sensor on the upper hose, and the fan still keeps playing this game!I've read on here about the relays that control the fan sticking, but the fan is definately under some control as it switches on after a short while and switches off after the ignition off period. I've checked for signs of head or gasket failure, but seem ok, and as said the water is not overheating... She's a mk1 1.9 tdi, 2000 Please help!!!! Tim Quote
seatkid Posted September 12, 2010 Report Posted September 12, 2010 The cooling fan comes on when the aircon is switched on. If you have climate control, then the fan comes on when AUTO is selected. (irregardless of whether your a/c actually works or not). Quote
nicebutdim Posted September 12, 2010 Author Report Posted September 12, 2010 Thought of that, I have aircon but don't have climate control. It's the simple system where you push the fan switch to turn the aircon on, no other controls. It's only one fan coming on, the one nearest the airbox. Tim Quote
nicebutdim Posted September 18, 2010 Author Report Posted September 18, 2010 Looks like I sorted it. Plugged in vagcom yesterday and the temp sender said the water was at 108.5c, even though it was stone cold! Replaced today and fan acting normal now. Just a coincidence that the sender went at the same time I did the water pump and thermostat! Quote
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