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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Posted on Jan 02, 2017

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1 Answer

Even with a fully charged battery i need to use a battery pack to start the van when it does start the cooling van comes on for a minute then goes off and that continues


Check rear AC in van and turn it off. Most vans have dual AC. Even if the front AC is off, the rear is still usually on and some vehicles have the cooling fan and condenser fan run together to help with cooling. Check relay and fuse also.

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I bought my 1999 oldsmobile cutlass new and now im having problems with my motor fans coming on,my ac don't work anymore but for the fans to come on I have to turn my ac switch on,if I switch to heat


If the fans work, (I'm guessing there are two of them) only when the A/C is on, then it means that the temperature sensor is damage. If possible, have a professional take a look at it. Both fans are OK,

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Hi, Yes you have an air lock in your system, you may get this sorted by 1/. Removing one of the cooling hoses & try to blow with air.
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HEIL HVAC, fan blows but no heat or AC


Your airconditioning system may be out of cooling gas, and if it has sufficient gas, the compressor might not pick when you put on the AC, and if the compressor did not pick ie start, you cant experience cooling effect, the fan will only be blowing.

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2 Answers

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

Sep 06, 2012 | 2002 Chevrolet Prizm

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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I have a 95 accord LX. I've had some overheating problems and neither engine fan comes on. I tested the A/C fan by unplugging it and testing the power to the harness. It had power to the connection. Would...


The AC cooling fan (in some cars) is tied to the operation of the AC only. Others are used as auxiliaries even when the AC isn't in use. Your normal fan is likely controlled by a thermal switch located in the bottom tank of the radiator and these are not uncommon failures, not terribly expensive or difficult to replace. It may be sloppy, but it is safe to leave the battery connected but the key removed when doing this; there won't be power to the connector if the engine is cool.
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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1 Answer

Cooling Fans coming on shortly after starting cold vehicle Ford Winstar 2001


climate control units in most cars use the ac system to regulate temp in the cab. the ac system requires a fan to pull air over the condensor on the front of the car. its normal for a fan to come on. unless you have a bad engine temp sending unit thats causing the engine cooling fan to come on improperly. try turning off the heat and ac and see if it still comes on.

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1 Answer

1995 honda accord ex auxiliary cooling fan not engaging


The accy fan you are refurring to is actually the a/c consensor fan.The only time that fan operates is with the cycling of the a/c system.Verify by turning a/c on ,fan should come on & off with a/c cycles..

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