Question about 2002 Volkswagen Jetta TDI

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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 w/ac on lower cooling hose not hot - upper scalding hot- little flow into coolant tank -- thermostat? radiator? (just replaced water pump 7K miles ago)

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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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Posted on Aug 28, 2010

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My volkswagon jetta 2.0 from the year 2002 is overheating and it blew up a few pipes i already replaced, but it still over heats i wish to know how can i fix the problem, and what might be the problem?...


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Get some engine flush into the cooling system and run the car for a couple miles. Then let it cool down and remove all the water(Take both large hoses off the radiator). Then stick a hosepipe into the radiator and let the water run until clear.
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1 Answer

The temperature gauge goes to the High and basically makes like a dinging sound, then it goes back down almost immediately. The car has not overheated but does make a gurgling sound when we shut the car...


before you think the thermostat is bad, first look in the fuse/relay box. lift the lid and look inside the lid for the correct location for the cooling fan fuse/relay. also if that is ok then unplug the cooling fan and use jumper wires to jump from the fan to the battery. if the fan runs then the relay maybe bad or the coolant temperature sensor may be going bad. rule of thumb if the car has run for awhile and got hot u can touch the upper radiator hose, if its hot then the water is circulating. if the upper hose feels cold then the thermostat is stuck open. replace the thermostat.

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1 Answer

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Are the cooling fans running when engine overheats?If no find out why.If yes ,is the upper radiator hose HOT when overheating,if not replace thermostat.If fan works,thermostat open and not low on coolant last possibility is a blown cylinder head gasket.

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1 Answer

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make sure you have radiator full of coolant
run the car to operating temperature
check the operation of the cooling fan
feel the upper radiator hose and the lower radiator hose. they both should be hot.
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1 Answer

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1 Answer

I have a 2003 VW Jetta 1.8t that is overheating. Replaced the thermostat, temp sensor, water pump. Fan will run when AC is on, but haven't had it running in hot enough weather to see if the cooling fan...


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Ensure cooling fan is cutting in at the appropriate engine temperature - check operation of the fan controlling relay,
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1 Answer

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2 Answers

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