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arnbab

Temperature Gauge Drop Despite New thermostat

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Hi everyone, hoping someone may be able to shed some light on this. Bought a 2001 e46 330ci manual 114k.  Noticed the temperature gauge dropping from 12noon when driving. Will rise again if I sit stationary for 5-10mins, otherwise will sit just above the blue.  I had a look on the forums and saw about stuck open thermostat.

Had new thermostat done by my indy.  Still got the same issue....

Gonna give them a ring but any ideas what else may be wrong?  Cabin heat temperature also drops when the cluster reads that the engine temp is too low, then improves when rises if i sit stationary.  Other than that the car is running perfect. 

 

Thanks for any advice. 

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