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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > Thermostat? Heater Core?



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      03-27-2011, 05:41 PM   #1
335i101
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Thermostat? Heater Core?

Not sure what my problem is...little to no heat in cabin. Lower radiator hose cool/cold, upper is hot/warm.

No smell of coolant or leaks on floor. So, I think it is thermostat. Can I just replace that without soon the waterpump......if so anyone know of DIY??
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      06-16-2011, 09:17 AM   #2
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I know this thread is old, but did you ever find out what the problem was?
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      06-30-2011, 10:46 PM   #3
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Quote:
Originally Posted by rusty_g80 View Post
I know this thread is old, but did you ever find out what the problem was?
Nope....luckily it summer so it is bothering me...until winters comes again....
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      12-31-2011, 02:27 AM   #4
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Ok I have almost no heat in the car.... I made apt at BMW and they said it is probably a water valve and is easy to check/fix.....anyone know I can do it?!?
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      01-02-2012, 11:54 PM   #5
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I had the same problem with mine last year, they had to replace the whole radiator because of a faulty sensor that is installed in it.
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      01-04-2012, 03:14 AM   #6
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Quote:
Originally Posted by Caruso0644 View Post
I had the same problem with mine last year, they had to replace the whole radiator because of a faulty sensor that is installed in it.
Thanks for the words of encouragement....do you know the price of that??? I think anything is cheaper than replacing heater core...
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      01-06-2012, 07:32 PM   #7
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Went to dealer today, they flashed the system and said I needed a 2k heater core....
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      03-25-2013, 08:48 PM   #8
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I have a similar problem with my 335i, low heat. When the car is up to temp all hoses are hot (upper/lower radiator hoses and both hoses to the heater core).
The temp out of the vent gets to about 105 -110f (my 328 gets to 130f)
All the controls work so I hope that the heater core is not clogged. Could this be if both heater core hoses are hot?
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      03-30-2013, 06:17 PM   #9
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I was able to flush out the core using compressed air then filling with water and continuing to use air to clear the lines. now the temp is 140!
I had to flush it about 10 times until the water was clean coming out.
I had to try it before coughing up $2k
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