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Overheating I have a 01 jetta gti that is overheating, it has coolant but i dont know what else it could be

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Here are the cooling system diagnostic steps...First does the cooling fan kick on (with engine hot)? If not, check the fuse, if good then check the thermoswitch in the radiator (it's about an inch and a half in diameter located on the lower part of the radiator with two wires ) by disconnecting the wires and touching them together (again, with engine hot...at least 190 degrees) if the fan comes on, you have a bad switch. If not connect a 10 gauge jumper wire from the battery to the fan itself (there are three terminals,,, one high, one low and ground). With power direct from the battery (and a ground wire, if necessary) fan should run... if not replace the fan assembly... if it does run then you have a bad cooling fan relay. If the cooling fan system is working normally and you still are overheating, the next thing to check is for coolant flow. let the engine cool and remove the reservoir cap and start it and let it run to operating temp. The upper hose should warm up and you should see a thin stream of coolant entering the reservoir... if not let it cool again, raise the vehicle, place a drain pan beneath the engine and remove the T-stat from the housing and button it back up. run again to operating temp... if you now have flow, and it doesn't overheat it was the 'stat. If it still overheats look at the water pump... is it noisy while running? is it weeping coolant? if so replace the pump. if not it's time to suspect a radiator blockage... try backflushing, if it seems to take alot of pressure and very little come out the other outlet the radiator is at least partially clogged and should be rebuilt or replaced... Hope this helps...;-)

Posted on Apr 15, 2009

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I have a 1980 cabby with a 91 Gti 8 valve motor. Keeps overheating. I think the problem is a combo of low oil and low coolant.. That I can take care of.. but how much coolant goes in it? and do you...


yes fill up the radiator makin sure not to open it wile hot then fill the plastic reservoir that say coolant that you only fill to the fill line you wont have any trouble.

Jan 29, 2011 | 1991 Volkswagen GTI

2 Answers

91 gti 8valve overheating problem blows coolent smoke on the..


Hi,
I'm not familiar with your model to know if you have an engine temp guage or a light that would come on if the engine is overheated. You said the motor wasn't overheating under the hood... but you have an overheating problem? Maybe just a tad bit more info...
Are you losing coolant?
The water pump if bad, would probably leak or make terrible racket.
Just to take a shot at it, since you said it blows smoke through the dash... I'm assuming a kindof white smoke with a rather sweet smell? Have you noticed any wetness on the passenger floor at all? If yes to any of this, I would suspect as you mentioned, a leaking heater core. Hope this helps... Good luck!

Aug 13, 2009 | 1991 Volkswagen GTI

1 Answer

My vw golf gti mk2 is overheating


replace hoses that feel spongy check coolant level also check oil level low oil can cause overheating too

May 25, 2009 | 1991 Volkswagen GTI

1 Answer

Keeps overheating,although i add coolant!


Most likely scenario is you could have a bad thermostat. Remove it check it and replace it if found faulty.Mike

Apr 26, 2009 | 2002 Volkswagen Jetta TDI

1 Answer

01 jetta overheating on the highway


The most likely cause of this is the fan not kicking on... and the best place to start looking is the fuse for the rad fan (under the dash). If this is good check radiator thermo-switch... Observe the engine as it comes up to operating temp... if the fan does not kick on by about 200 degrees, disconnect the terminals at the switch and connect them together briefly. If the fan comes on then the switch is faulty, if not then suspect the cooling fan relay. If the fan runs normally but vehicle still overheats, the next thing to check is the T-stat. Feel the upper hose when at operating temp... it should be warm... if not remove the T-stat and reassemble... if the problem goes away it was your T-stat, if not it is either a bad pump, or a restricted (clogged) radiator. If the pump is not noisy or weeping coolant, it's probably OK... Hope this helps...;-)

Apr 02, 2009 | 1999 Volkswagen New Jetta

1 Answer

01 VW jetta coolant fan does not cut on


disconnect the cooling fan temperature sensor on the engione that turns on the fan, if the fans runs the switch/sensor is defective.

Mar 28, 2009 | 2001 Volkswagen Jetta TDI

3 Answers

2000 Jetta Heater Not working


2000 jetta warms up when idling, but gets cold as soon as I start driving.

Dec 17, 2008 | 2000 Volkswagen Jetta TDI

1 Answer

Brake ligth indicator won't go off for the emergency break


get it to a reputable garage and have a diagnostic test done it will tell u if a relay switch or sencor is down worth spending £50.00 to check it

Nov 24, 2008 | 2002 Volkswagen GTI

1 Answer

01 WV jetta comunication error when trying to use the obd scaner


I worked on a Jetta with a similar problem of no communication. By chance do you have an aftermarket radio in the car? If so the buss lines that carry the vehicle comunications may not be connected thru the radio. The data lines run thru all the computer modules so they can talk to each other. This could be the problem.

Nov 21, 2008 | 2002 Volkswagen GTI

1 Answer

Jetta GLI 2005


there is a coolant flange on the side of the head that cracks and leaks on those. but to go through that much coolant in a day you should see puddles building up. make sure you are not mixing coolants on that i can cause a huge overheating issue. if you dont have vw coolant just use water until the leak is fixed

Jul 24, 2008 | 2005 Volkswagen Jetta

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