Question about 2004 Volkswagen Jetta

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I have A 1994 VW Jetta GLS, and I've been having problems with it overheating. I've replaced the coolant reservoir, upper radiator hose, the thermostat, the cooling pump, the lower hose is new, and it still backs up into the coolant reservoir. when its parked it doesn't overheat anymore but it does still back up and spill out, What else could it be?

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Can be a clogged radiator,or a air lock in system or fans not working or top gasket blown.hope this helps

Posted on May 23, 2011


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The radiator fan on my 2003 VW Jetta GLS won't turn off for a long time after the key is turned off, even if the car engine is cold. Is the sensor switch a possible cause? If yes where is it located

Coolant temperature sensor. Located on drivers side of the cylinder head, facing the fire wall, can be a little hard to see. Follow the upper rad hose to the plastic housing, the temp sensor is on the back of this housing. It should be green, if it is black it is definitely the problem. Not to hard to change, just hard to get your hands back there, take off the air cleaner hose to get easier access

Feb 03, 2014 | 2003 Volkswagen Jetta TDI

1 Answer

My 1994 Buick PA overheats and it seems that the anti-freeze in the reservoir tank never moves--it is still the same brand new fluid thats been in there for a year.

replace the hose and fill the radiator.
There is a bleeder screw where the hose connects to the engine.
there is probably a fluid loss somewhere causing the overheating.
check for wet spots near hoses and if they are really old replace them.
on the right side there are two heater hoses that can cause overheating by leaking. they can be metal and you have to pick them up to see if fluid got under them.
worst case would be a head gasket or damaged head.

Mar 06, 2013 | Cars & Trucks

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2000 Jetta GLS 2.0 Overheating

Sounds like you got a bad thermostat.

Apr 15, 2017 | Cars & Trucks

1 Answer

Stevemy 99 vw jetta 2.0 the cat overheats and burn the oz sensor

Hello and welcome to FixYa!

If you have overheating problem, it can lead to multiple issues. You may be running on low coolant that's why the vehicle overheats. If that's the case, please add coolant and make sure that it sits on the right level, too much coolant can cause overheating too for coolant will overflow.

The vehicle may have a faulty or worn out radiator blower motor that's why it overheats. If that's the case then you will need a blower motor replacement to resolve the issue.

If the radiator is clogged with dirt and rusts this issue occurs too. The coolant doesn't flow normally on the cooling system if it's clogged. If that's the case, I strongly suggest that you have the radiator flushed to drain out dirt and rusts. If you think that the radiator served you enough then it's better to have it replaced.

Please do check the radiator hoses, If you have worn out hoses it can cause coolant leakage which can result to overheating. A tiny hole is good enough for the vehicle to overheat.

A faulty thermostat sensor can cause the issue too. If you have worn out thermostat, the fan may not trigger that's why the fan won't work when under stressed conditions. A blown radiator blower fuse can cause this issue too so I suggest that you check the radiator blower fuse and replace it when necessary.

Hope you find this information helpful enough and thank you for using FixYa! Have a good one!

Apr 26, 2011 | 1999 Volkswagen Jetta

1 Answer

1995 Volvo 850 Overheating

head gasket is blown

Apr 26, 2010 | 1995 Volvo 850

1 Answer

I have a 2003 VW jetta tdi

You've lost engine coolant somewhere, and need to fill the engine back up with the VW special G12 coolant.

Then find the leak, which will be in one or more of the following places -
Water hoses to heater core, including any other coolant carrying hoses in the engine compartment
Radiator hoses
Plastic manifold bolted to side of engine which is known to leak (have replaced on an '01 VW Beetle, and an '02 Jetta, both members of our family in the past few years.).
Overflow reservoir cracked
Radiator leak.

Reply back what you find. If the engine got too hot, you may need to have the thermostat replaced.

Feb 03, 2009 | 2003 Volkswagen Jetta TDI

1 Answer

Finding Thermostat on 98 Jetta GLS

Its to the right of the water pump towards the bottom of the engine.. Follow your lower radiator hose. Make sure to get some G12 coolant from VW before you do it. If you mix the coolants they turn into a gel that will cause you to overheat.

Jan 05, 2009 | 1998 Volkswagen Jetta

2 Answers

Do I need to burp this system 97 jetta

well bleeding the air out of the coolant system is pretty easy to do at home and will cost you very little to nothing. You can do it 2 ways and it should work either way. first of all you have to make sure that your radiator cap is higher than the point where your upper radiator hose goes into your engine. If it's not follow you upper radiator hose to where it goes into the engine and there should be a little bleed valve there it's prolly a 10mm bolt looking thingy. open the radiator cap or crack open the bleed valve, start your engine and let the coolant travel around for awhile to work all the air out. just keep an eye on the engine temp. let it run for about 10 minutes or so and close it up and see if that helped any.

Aug 19, 2008 | 1997 Volkswagen Jetta

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