Question about 1999 Audi A4

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Auxiliary fan My auxiliary fan isn't coming on at all even when i put my ac on and it is causing it to over heat i have changed everything on the cooling system water pump and all. I also changed the fan relay and the fan switch did i miss something?

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  • roofboy2 May 08, 2009

    i have a 1998 and i am having the same problem changed out the water pump and the cooling fan and the switch and i dont think i have two switches so does anybidy have any idea.

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I think there are two fan switches on the 99 but I don't recall for sure. At some point during the B5 chassis run (96-01) they went from two two-wire switches to a single integrated switch. It's possible that you have the two switch design and only changed one of them. Also, your fan clutch could be shot. If you spin the fan, it should spin one revolution or less and then stop. If it spins freely the clutch is shot and needs replacement.

Posted on Jul 25, 2008

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On my 2006 ac works good when engine is cool, in stop & go traffic it blows hot air & head pressure gets high in ac, car temp is ok what's wrong


How do you know head pressure is high? Do you have an auxiliary electric cooling fan that is not coming on in this situation? It should be in front of the AC condensing coil. There may be a switch tied to the system that is bad. This switch is sometimes activated by the pressure in the high-pressure line to the condenser coil. If there is not enough freon (134a) the pressure will not be high enough to activate the cooling fan switch. I recently added one can to my system and it made the fan run whereas it did not before adding the freon.

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Overheating problem, what is the most probable cause?


You need to stop using it immediately before you
cause some damage or more than you may already have
That is just common sense. It should not overheat or
be any different than it was in the past without problem

The car has to be checked over/diagnosed,tested,etc for
various issues to resolve

Borrow or Rent a car until resolved

No way to guess at the problem

You should have some type of codes avail even
if the check light isn't on,you need professional help
to get a start on resolving

The timing belt maybe worn & jumped or the head gasket
bad.

Over heating isn't usually a cheap repair unless the thermostat
sticks partially closed

The RPM moves around the car is 11 years old,so it may just
need a though going over

Timing Belt,O2 Sensors,Exhaust Converter,Spark Plugs
and such

If you depend on a repair shop to do things & don't
have the knowledge to request work done throughout
the year,then you run into a lack of proactive preventative
maintenance situation. Most things are simple looking
back, once resolved

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1 Answer

Car Overheating


Having to use the heater as a auxiliary cooling source simple tells use the cooling system needs a little help.
1. make sure the AC and Radiator coils are not plugged on the outside
2. let the car idle until normal operation temp is achieved, see if the cooling fan comes on
a. if not the fan is at fault
b. the fan sending unit is at fault
c. or dirty or broken wires

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My 2002 Volkswagen GTI has been overheating. It almost hit 290 every time. But it only does that when im driving. Theres also steam coming from the bottom of the reserve. I notice my auxiliary pump is...


the lose of pressure is causing the overheating, VW and most other German cars, require that the cooling system be sealed to hold the pressure in order to maintain the right temperature. The leak in what I am guessing is the water pump is causing the system to lose pressure therefore it is going to gain heat. In other words repair the leak and you will fix the overheating issue.

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Check the lower radiator tank for a largish hex-headed sensor with one or two wires coming from it. It (or they) will be plugged into a mating connector. With a container to trap lost coolant (it can poison animals) and a tight cooling system, these switches can be removed and quickly replaced with little coolant escaping. Use Teflon tape on the threads of the new switch and do not over-tighten the switch when installing.

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1 Answer

My temp goes up when my car is idle and the ac on


If the temperature goes up when the ac is on, then there may be a problem with the circulation of coolant throughout the system. You said you changed the thermostat which is good. But, did you backflush the engine's cooling system so that maximum flow can be achieved?

On the other hand, the heat that comes off of the condenser can cause the radiator to cool less efficiently on hot days.

Does the fan immediately go on when the a/c is turned on? or is it the older style fan belt driven fan? Even, so, if it's an older style fan, the clutch sometimes go bad in them so that the fan doesn't spin as efficiently as it should.

Also, did you use 50/50 Antifreeze to water ratio coolant mixture?
If you use pure Antifreeze 100% concentration, then it can cause an overheat condition, because the fluid at this concentration doesn't transfer heat as well as a 50/50 solution of antifreeze to water.

Good luck fixing this problem.

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