I recently had a bad thermostat replaced on my '95 BMW 740i. This resolved the problem of getting the interior heat to come on more quickly as well as getting the motor up to operating temp faster as the old thermostat was visibly stuck about 1/4 way open. The mechanic, (friend or a friend) Not a BMW Dealer, had broken radiator nipple for the 1 1/2 inch top hose connect. We learned this when the car over-heated badly on the way home. The broken hipple could not hold the hose on when up to operating temperature. After replacing the radiator, we no longer have interior heat despite perfect operating temperature on the temp gauge. What could have been damaged to cause this? We did try bleeding the coolant system several times. Could this be a bad heater vavle? Thanks for any help.
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The first thing I do when addressing this type of issue is to check the heater hoses going to the heater core and see if they are getting hot, if not then find out why. This will help to isolate the problem inside the vehicle or in the engine compartment.
