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:) 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
 

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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.
 

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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.....
 
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