Question about 2002 Volkswagen Jetta TDI

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Hello. I have a 1989 Jetta CSL. The radiator fan wil not come on. I replaced the switch on the radiator and the thermostat but it still will not come on. When I remove the cable from the switch and put a jumper on the cable the fan starts up and runs fine. Any ideas ?

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  • Volkswagen Master
  • 6,826 Answers

Trace the wires from the fan to the relay.

Posted on Dec 31, 2010

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Posted on Jan 02, 2017

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My 1989 mazda 323, 4 cylinder, 1.6 is overheating. I change the thermostat and where the sensor wire hooked to the thermostat housing, it was turning. The fan comes on after the car has overheated.


The in radiator temp switch gas malfunctioned and needs replaced. It's at the wire from the fan to the switch wherever it is mounted in the radiator.

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2004 Jetta 4 1.6 Overheating problem. i noted that the radiator fan did nit switch on. Also noted that the top hose to radiator was warm and botttom hose was "cold". I changed the fan, the heat...


remove cooling flute and thermostat fit1/3 off radiator cleaner with fresh water top up 1/3 more in and 1/3 two days later drive for 1 week and flush your system fit new thermostat new radiator cup and antifreeze .notes radiator blockage after removing the thermostat is,when engine is hot top hose expand and is hotter then the bottom hose notes when the fans engage.

Sep 02, 2012 | Cars & Trucks

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The cooling fans to the radiator are not working.


This is usually the problem with a fan is the thermostatic switch. Bridge out the thermostatic switch on the radiator which operated the fan. If the fan works, replace the switch. If this does not work, check the wire connections and the relay. Also, with the ignition on, one of the wires on the switch should be live, you can check this with a test light brounded to the body work.

Jan 30, 2011 | 1989 Toyota Camry

1 Answer

2002 Jetta 1.8T blew 40A cooling fan fuse - overheated, destroyed 4 way cooling hose connector - replaced all- now it still runs very hot, inside temp reads 190 (but temp is much higher), cooling fans run...


Then replace the thermostat, because if on lower hose not hot and on upper hose scalding hot = antifreeze flow blocked by the thermostat wich remains closed!!!

Thermostat replacing:


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Aug 27, 2010 | 2002 Volkswagen Jetta TDI

1 Answer

ENGINE OVERHEATING


Do the fans come on when the engine overheats? If so nothing wrong with the circuit and the thermostat(not thermo switch!) or radiator is to blame.
Test the fan. There are 2(if you have A/C fitted) Disconnect the electrical plug from the fan. Run 2 wires from the battery straight to the fan and see if the fan comes on. (Be careful when connecting not to short circuit the wires. Theres a lot of power in the battery!) Polarity does not matter. This is a direct current motor so reverse polarity will only make the fan turn in the wrong direction. If the fan turns reconnect its electrical connection and move to the next step.
To test the fan circuit locate the thermo switch. It is on the bottom right of the radiator and has 2 wires connected. disconnect the electrical plug and short circuit the 2 wires by inserting a piece of wire into the connector with the ignition on. The fan should come on. If it does the thermo switch is at fault and needs replacing.
With the electrical sorted there is not much else. Like I mentioned it is either the radiator(blocked) or the thermostat(sticking)
Radiator can be taken to a service centre and have them clean it out for you. The thermostat cannot be repaired and needs to be replaced. It can be removed and the engine will still operate, but just take longer to warm up. I'm not sure on the '99 model, but it is usually located on the right hand side of the engine at the bottom on the water pump housing.

Jul 07, 2010 | 1999 Volkswagen Jetta

3 Answers

Over heating , fan not working


What exactly is your question? If your fan is not working, you have already determined the problem.

If the fan is functional but not turning on, I would guess that there is either a blown fan fuse or faulty thermostat.

Sep 09, 2009 | 1998 Honda Passport

1 Answer

My 2001 VW JETTA GLS IS OVERHEATING


If one pipe from the radiator is hotter than the other one its usually the thermostat or water pump, seen as you already changed the thermostat id say its the waterpump.if you start the car when temp. is syill low enough to take the radiator cap off and leave it idleing and you see bubbles from the water at the cap then you possibly have a blowen head gasket etc

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2 Answers

1996 Jetta Treck - overheating


thermostat replace temp sensor its cheap i hope your water pump is not bad you could mess engine up if you keep on running car and is overheating.

May 16, 2009 | 1996 Volkswagen Jetta

1 Answer

1989 golf overheats


Try REMOVING the thermostat... if this cures the problem then the thermostat was faulty or incorrectly installed or the wrong T-stat. If this does NOT fix it then suspect a clogged radiator... (this would explain why the fan doesn't come on.. the thermostatic switch in the radiator doesn't warm up!)

Apr 11, 2009 | 1995 Volkswagen Golf

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