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2001 Z3 roadster Engine runs cold Is there a fuse or switch for the thermostat one could check if its bad BMW wont tell and want yours truly to bring it in to have thermostat housing replaced?
Wiki User
∙ 13y ago
Do you mean the internal heater? If so its possibly air locked from the radiator. My 2002 Roadster had this problem. There is a cross headed plug screw next to the filler. I removed this and filled the radiator .You need to make sure that you bleed all the air out of this section. I suppose you could blow into the filler until water comes out of the cross head bleed opening. Obviously whilst the engine is cold .Or WARM the engine with the plug slackened off until just water comes out. DONT OPEN THE FILLER WHILST THE ENGINE IS HOT. BOILING WATER COMES OUT.
Wiki User
∙ 13y ago
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Engine runs cold in 2001 Z3 roadster Is there a fuse or switch for the thermostat so you could check if its bad BMW won't tell and want to have thermostat and housing replaced?
If your dashboard gauge is ok and the needle is moving when the engine start to warm up but never attempt the middle you have to check the thermostat as follow: you start the cold engine and carefully you keep your hand on the hose which transfer the cooling fluid from engine to radiator. If immediatelly after starting the engine the hot water goes through the hose, is 100% shure that thermostat is blocked open and needs to be replaced. A blocked thermostat in the position closed will cause more damaged because the engine will be overheated and the headgasket will be "burned".
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