aig

1992 Audi 100 2.8. Radiator fans working non stop. They go on when starting the engine and never stop. What I should check? Thanks

MikTip

Could be the after run circuit?

Could be the Rad fan circuit?

Could be the a/c high pressure switch circuit?

You need the wiring diagrams to troubleshoot correctly & locate the above mentioned components.

aig

I guess I have to call my mechanic, again.

aig

if it is a AC high pressure switch circuit, how can I check that without a Bentley Manual?

Thanks

MikTip

First you have to be able to find & identify the a/c high pressure switch for your make & model of Audi. Then disconnect its electrical plug to verify it is to soure of the problem.

WARNING*-If you do disconnect the a/c high pressure switch, DO NOT turn on the a/c system with it disconnected, as it may damage the a/c compressor.

Who serviced your a/c system? Dealership?

Your particular system is very sensative to over-servicing, and as little as 8 grams extra froen can cause major problems!

MikTip

Ask him how much freon was added?

Too much and you run the risk of blowing the a/c evaporator, up inside the dash!

Ask me how I know? ;o)

ARK

Check the 2 (or 3) fan relays (sometimes stick ON), and the radiator fan thermoswitch.