Hi people. I am new to this forum.

I have a problem with my Audi 80, 1.9 TDI from 1992.

When I bought the car the temp. was constantly at 80. One year ago I got problems with the temp. going up to about 95 under heavy load. I contacted my Audi dealer, which changed pump and thermostat, but the problem was still there. They then told me that the water was leaking into the engine, and that this repair would cost 2,500$.

I went to another mechanic who told me that the problem was not with the water leaking into the engine's oil, but he was unable to fix my problem.

Then came winther, and it got a little better, so I didn't worry about it, until this summer, when the problem again got worse.

When I drive up-hill I get temp. around 95, which is too much. Sometimes it reaches 100.

Anyone got any ideas? How high temp. can the car take before I should worry about it?

There are 2 fans in the front. When are these supposed to start working? Yesterday I started the car in the carage, and the temp. got up to 100 degrees, but the fans were not moving. Is this normal?

Overall it seems that the car enjoys beeing between 80 and 95 degrees. If I don't put load on the car, the temp. will fall to 80. When driving up-hill it goes up to 95 - 100.

Any kind of reply is appreciated.

Thanks,

Limbo

 

It may be simple as a fan switch, also check if thermostat is open when hot, just check if bottom hose is hot.
It also might be simple as fuse, chech them first.
then if okey just turn the key on, dont start the car just light up the panel, disconnect fan switch and shorten it so that it would start the fan. if works its good, doesn't bad. check the ground and positive wires under and on driver side in front.

 

Check the obvious first. Check the radiator so that you can see through the fins and that the fins are not corroded and/or disintegrated. Then check the duct work, on some models there might be air ducts and deflectors. Often these either break or fall apart. Next is the thermo switch. I don't know if the TDI is equipped with a single, dual or even triple stage cooling fan. All three stages should work. The temperature(s) should be stamped on the body of the switch. If you have a continuity meter and thermometer, drop it in boiling water and see if it works.

 

I see some dirt in the radiator. I can post a picture on the web, so you can have a look at it.

A few days ago I tried running the car hot in the garage. The bottom hose got really hot when the temp. got to around 100, but not before.

I am not much of a car mechanic, but am interested in learning, so I will do my best with these suggestions and a little help from my mechanic-friend

Appriciate the help a lot. Thanks guys.

Limbo

 

I went out and bought me a new thermoswitch. It's part number 191959481C.

The one that is in the car currently is 191959481A, and was put in by the Audi dealer 1½ year ago, when they tried to fix my problem.

It says:

95 102
---- ----
84 91

On my new switch. Why so many degrees? When should the fan start?

 

If I remember the part numbering scheme correctly 191959481A and 191959481C should be the same I think the last letter is production plant or origin. The 95 102 is the temperature, first stage is 95C to turn on second stage is 102C. 84 91 could be the date code, 84th day 1991.

 

Ok, thanks for the info.

I got the fan working with the new thermoswitch, although the Audi dealer changed it 1½ ago.

So now I look forward to going for a long drive uphill, and seeing if this will fix my problem.

Should the temp. lay constantly on 90, or should it move a little around? And if so, how much?

It seems to go up to 90 when I give it some gass, but when I idle it heads down towards 80 or 85 again. In other cars I see the temp. staying constantly on a single point, no matter how I drive.

 

I have problems too, when I stand or accelerate to like 30 MPH in like 5 sec temp rises up to 95C. when I drive it constant on 30MPH it staies like 90 - 92 C if I drive like >45MPH temp is like 87C-89C

 

ok. What range is normal for the car?

When should I start to worry?

Mine doesn't heat or cool that fast. It takes a few minutes for it to heat up when I put gas on it.

 

mine too. the temp should stay firm on 90C I believe. If you in trafick it should rise just a bit so that 1 speed turns on. on higway it should stay a bit lower that 90 C. This is how it should be. on young models temp stayes always 90C