Question about 1999 Volkswagen Jetta

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1999 VW Jetta, it overheats even after I replaced the thermostat and the plastic housing on the drivers side of the engine (it was cracked). I let it run with the res. tank open because I thought it might have air in the system, but nothing helped. Is there any other things to check?, the fans does not come on and there is no heat coming out the vents, also the lower radiator hose does not get warm.

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  • Volkswagen Master
  • 2,407 Answers

Hello Kustomklean,

Eight (USA) domestic engine choices for this car.

The symptoms you are describing would
indicate a possible WATER-PUMP failure...

or

A heavily sludge condition (block) in the RADIATOR.

Before I would take ON that task...

I would do (or hire) a COLD PRESSURE test on the
vehicle to identify ALL cooling issues...
https://www.bing.com/search?q=1999+vw+jetta+water+pump+replacement&form=EDGEAR&qs=PF&cvid=76914cdfa4a141cdb6c35777d1deaca0&cc=US&setlang=en-US&PC=DCTE

And do consider of a real SHOP MANUAL: borrow/buy.

While the internet abounds with VERY entertaining
information... there is nothing BETTER than doing
the job correctly.

Stant Cold Pressure tester:
Amazon com Stant 12270 30 Pound Cooling System AndPressure Cap Tester...

Rockauto
http://www.rockauto.com/en/catalog/volkswagen,1999,jetta

Hope this helps

Carnac the Magnificent

Posted on Aug 05, 2017

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  • Volkswagen Master
  • 1,717 Answers

Did you install the thermostat backwards? It could be air bound.jack the car up on the side the radiator cap is on and run it to try to purg out air.your new thermostat could be bad. Remove it completely and see what happens.as for fan not working check connections and relay.if it has air conditioning that works turn it on and the fans should come on.if not there is either no power or bad fan motor.check with a test light for power at fan motor connection.

Posted on Aug 05, 2017

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Posted on Jan 02, 2017

  • 145 Answers

SOURCE: 1999 VW Jetta, it overheats even after I replaced

With the symptoms you describe, coolant is not circulating through the system. Your first move to replace the thermostat was good. My next move would be to replace the water pump. Good luck.

Posted on Apr 04, 2011

  • 1 Answer

SOURCE: 1999 VW Jetta, it overheats even after I replaced

i replaced water pump and thermostat in 97 jetta. the car still over heats. the bottom radiator hose gets hot and when i squeze it i can tell water is circulateing. fans do work but i dont know if they are kicking on like they are post to. how do i figure out what is going on

Posted on Jul 03, 2011

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1 Answer

Coolant leaking from side of engine 2004 jetta


On the driver side Of the engine there is a plastic housing that houses the coolant temperature sensor and a couple of hoses go to it. This housing I a common failure item on VWs. It leaks on to the transmission and is a cause of overheating.

Jun 27, 2012 | 2004 Volkswagen Jetta

2 Answers

1999 VW Jetta, it overheats even after I replaced the thermostat and the plastic housing on the drivers side of the engine (it was cracked). I let it run with the res. tank open because I thought it might...


With the symptoms you describe, coolant is not circulating through the system. Your first move to replace the thermostat was good. My next move would be to replace the water pump. Good luck.

Apr 03, 2011 | 1999 Volkswagen Jetta

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My 2001 VW jetta started overheating, the drivers side fan was not working. So I replaced that! Drove my car a distance and it started to overheat again, so I checked the hose going into the thermostat...


u need a thermostat or the coolant cant cool it just keeps going around and around and never has a chance to cool try to put a thermostat in and the should work

Mar 28, 2011 | Volkswagen Jetta Cars & Trucks

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Where is my thermostat in 2000 jetta 1.9 liter


Heed of antifreeze coolant temperature!!!
First time you might check the thermostat operating.
The thermostat location for VW Jetta 1.9 TDI - AJM engine, is on back of the alternator at the bottom side of the bracket.
IMPORTANT: It is NOT necessary to replace the alternator if you want to change the thermostat !!!
Thermostat checking:
1. Cold engine. Start up the engine and watch of the water temp indicator. After first value 60 Celsius Degree you still warm up the engine until the lifter (pointer) reach 80 C deg. (second mark after 60 C deg.). At this time you let engine running at idle speed and check with your hand the thermostat plastic housing and hose temperature in bottom left side of the engine. Heed of alternator driving belt and ventilator fan !!!
2. If the thermostat is good the hose must be cold until the water temp indicator reach almost 90 C deg.
3. The thermostat opening temperature is 87 C deg.
4. If the hose is already warm the thermostat is out of order.

Thermostat location, Part number: 044121113, in german - "Kuehlregle" (Price around $25):

tdisline_179.jpg


Important note: Always replace the thermostat seal, position 7 in the above picture.

Please do rate my response. Thanks!

Jan 23, 2011 | 2000 Volkswagen Jetta TDI

1 Answer

Where exactly is the thermostat on a 88 jetta, i believe it is a 1.6L 16 valve.


VW family engine thermostat is behind the lower coolant inlet . It will be either a plastic or aluminum housing.

To find it...open engine lid and look down at bottom of radiator. You will see a rubber hose from the base of the radiator to the engine at the left side looking in. The hose is attached to the housing that holds in the thermostat.

FYI. Never run a VW engine without a thermostat in place or overheating will occur ....really !

Jan 16, 2011 | 1988 Volkswagen Jetta

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Where is the thermostat located for a 1991 Vw 1,8 Jetta


right hand side of engine above bell housing in that plastic housing

Dec 06, 2010 | 1991 Volkswagen Jetta

2 Answers

Thermostat location on a 1995 vw jetta


The thermostat on the 2.0 l ABA motor is located in a black plastic housing which resides on the UNDERSIDE of the motor, on the passenger side. It is normally hidden by the power steering pump, which must be moved out of the way in order to access the thermostat. Don't lose the o-ring!

Mar 11, 2010 | 1995 Volkswagen Jetta

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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

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