Weak heater...car also takes a LONG time to warm up.

[MikeM5]

Hmm...I actually have been having a similar issue with my M5. After replacing my radiator/cooling hoses, it seems to take a lot longer to get to the middle...

and the temp gauge again drops on the highway esp when not sustaining revs. t-stat definitely?

Hey boys and girls,

My 525i that I've had since the beginning of fall takes forever to warm up. I'm talking 25 minutes for the water temp to reach the middle, driving on surface streets.

Once warm, the heater is very weak. Not only is there not much air being blown, but the heat doesn't feel, well, HOT. I know that I do have the controls adjusted correctly. The "4" setting on the blower feels like what "2" should blow, but is very loud.

I'm thinking that the microfilters need to be changed, but surely there is another problem with the car.

Thanks for any and all advice.

[Vanguard]

Sounds like the thermostat is stuck open.

[grave77]

it happens even with new t-stats. they might jam. if they jammed open it will take time to heat the car and you will not feel hot air with the heater.

usually u wont feel the air flow like the cool air do, as it's kind of protection to ur health or you will get sick every time u leave the car. but you can still change the microfilter to get better flow. ur best place to check is that windshield and ur feet. there will be enough flow to know how its performing.

better you fix ur t-stat soon cuz it's not good for the engine.