[buzz endersby]

1991 Audi Coupe 2.3E. Have had overheating problems for a while which became critical recently. Have: new thermostat, temperature sender, new headgasket, waterpump, all sorts of belts, but still overheating. Have bypassed thermostat, rigged radiator fan to run continuously on highspeed, but still boiling over after 5 mile run and standing with engine running for 15 mins. Cannot seem to track down a radiator fan cooling switch with four pins (light brown). Are there different types/models of thermostats to use? Any ® any help or suggestions gratefully received

Buzz

 

[A6_25TDI]

If it's boiling with the fan at full speed, you may have a leak somewhere (did you check the water level?) or you may have a clogged radiator.

 

[maniacuV6]

the problem is absolutly sure the radiator.... i have the same problem because i put 2 different types of antifreeze and they did a chemical reaction.....