1999 Audi A4 Engine Coolant Thermostat

you did not say what car so I will give the obd-2 code reference It refers to cooling system performance===causes---radiator---coolant thermostat---engine coolant blower motor ( fan)ECT sensor.. If you have a heating problem then these causes will be close enough to give you some idea of where to look for the problem

Trace the upper radiator hose to the mounting area on the intake manifold. Loosen the hose clamp on the manifold end of the hose and remove the hose. Pull the thermostat out of the intake manifold.

For more help and troubleshooting go through the help links below:---

Click the link below:-----

THERMOSTAT REMOVAL PROCEDURE/LOCATION DETAILS

------------

Where is Thermostat Located on Saturn

http://technoanswers.blogspot.com/2012/11/where-is-thermostat-located-on-saturn.html

----------

2004 Dodge Intrepid: How to replace Thermostat?

http://schematicsdiagram.blogspot.in/2012/06/2004-dodge-intrepid-how-to-replace.html

---------

How to Replace Thermostat on Audi A4?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-thermostat-on-audi-a4.html

---------

How to replace Thermostat on Acura Car models?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-thermostat-on-acura-car.html

-------------

Where is thermostat located on 2006 dodge magnum 3.5L?//

http://repairhelpcenter.blogspot.com/2011/10/where-is-thermostat-located-on-2006.html

----------

Thermostat on AUDI 1.9 TDI?

http://repairhelpcenter.blogspot.com/2011/10/thermostat-on-audi-19-tdi.html

-----------

How to replace Radiator on Audi and VW car models?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-radiator-on-audi-and-vw.html

--------------

How to Replace a Thermostat.

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-thermostat.html

-------------

How to locate Thermostat on Any car model?

http://schematicsdiagram.blogspot.com/2011/12/how-to-locate-thermostat-on-any-car.html

--------

Where is thermostat on Audi A6?

http://technoanswers.blogspot.com/2011/12/where-is-thermostat-on-audi-a6.html

-------

How to replace thermostat on 1992 Buick century?

http://technoanswers.blogspot.com/2011/12/how-to-replace-thermostat-on-1992-buick.html

------

Replacing thermostat on 1999 Mercury Cougar?

http://technoanswers.blogspot.com/2011/12/replacing-thermostat-on-1999-mercury.html

------

Thermostat Replacement on Toyota Corolla?

http://technoanswers.blogspot.com/2011/12/thermostat-replacement-on-toyota.html

--------

Where is thermostat located on 2005 Dodge neon?

http://schematicsdiagram.blogspot.in/2012/02/where-is-thermostat-located-on-2005.html
--------
These will help.
Thanks.

If you are talking about the reservoir for the radiator, the radiator pulls coolant in from the tank when it is low.
If you are adding coolant - water every week and there are no external leaks, the engine is burning the coolant out the exhaust pipe.
Usually a leaking head gasket - intake gasket or cracked head.

3.5 hours

First time you might check the thermostat operating.

Heed of antifreeze coolant temperature!!!

The thermostat location for a 2000 Audi A4 1.9 TDI is on back of the alternator at the bottom side of the bracket.

IMPORTANT NOTE: 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):


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

possible bad thermostat

Hello,

The thermostat of a 2002 audi a4 is located between the engine and the radiator. The thermostat is small and crucial. It is meant for the vehicles cooling system. It moderates the flow of coolant into the engine by releasing it when the engine need it the most. The thermostat is designed to open its valve once the temperature of the engine reaches about 200 degrees F. Its purpose is to keep the engine running at a consistent temperature, allowing your Audi A4 to operate at peak performance.

If You are planning on replacing the thermostat, here are the steps to follow to replace them, try to get these instruments (Car ramps, 4-by-4 inch wood block, Metric socket wrench set, Socket extension, Pliers, Drain pan, Empty plastic container, Black marker, Towel, Emery cloth, Gasket seal) then follow the steps below:

1. Raise the front end of your Audi A4 by driving up on a set of car ramps and placing your vehicle in park.
2. Place a 4-by-4 inch wood block behind one of the rear tires to keep the vehicle from rolling backward.
3. Use a socket wrench to remove the pan that covers the bottom of the engine.
4. Locate the red plastic cap that was behind the pan that you just removed. This red cap is your radiator drain plug. Remove the radiator cap from the top of the radiator and then place a drain pan under the red drain plug and turn it with a pair of pliers to allow the coolant to drain completely from the radiator. Once the coolant has completely drained, turn the drain plug to close it off. Be careful when using the pliers on the drain plug that you do not snap the plug off.
5. Slide under the vehicle and locate the thermostat housing that is sitting just above the oil pan drain plug. Pour the drained coolant from the drain pan into an empty plastic container and label the container so that you do not reuse the expelled coolant. Place the empty drain pan under the thermostat housing before you attempt to remove the housing to allow the coolant from the engine to drain into it.
6. Remove the 10 mm bolts that hold the thermostat housing on the engine block with a metric socket wrench. Do not lay directly underneath the thermostat housing as the coolant from the engine will begin to drain as soon as you loosen the bolts on the housing. Keep a towel or cloth with you to clean off any spilled coolant .
7. Remove the thermostat housing from the engine and lift the old thermostat out of the housing. Use a piece of emery cloth to clean the face of the thermostat housing and the engine block where the housing is mounted from any remaining gasket material or debris.
8. Spread a layer of gasket seal around the face of the thermostat housing and place the new thermostat on the housing, with the thermostat spring facing out from the housing. Position the housing back on the engine block and secure it to the block with the bolts.
9. Replace the pan the sits across the bottom of the engine of your Audi A4 and then refill the radiator with coolant and put the radiator cap back on the radiator. Remove the wood block from the back tire of your vehicle. Turn the engine on and drive the Audi A4 off of the car ramps. Allow the engine to run at idle for a few minutes to verify that the thermostat is working properly and then shut the engine off.

Hope this helped. Thank You for using FixYa!!!

thermostat, waterpump ? also one fan is for engine. the second fan should power up after turning on ac

shack

there is a valvve that lets the coolant thru the heater core when heat is selcted then when it is off it goes thru thur the return instead of the heater core i bet your car is running a little off if it is the vavle works of a vacuum line and the vavle has a crack in it

If it's the same as the 99 2.8 V6 in the A4, it's quite a ways inside the front of the engine. You have to remove a lot of the front of the engine and you'll find it partially hidden behind the timing belt tensioner. Foolish place to put such a part unfortunately, but at least on my A4 that's where it is.