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  #1  
Old 09-20-2019, 06:22 AM
Raunylima7 Raunylima7 is offline
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Mein Auto:
Heater sometimes hot sometimes cold

Hi guys! Back again with another one.
It's starting to get cold here, and decided to use the heater. Took forever to warm up, but got warm. 3 minutes later temperature dropped blowed fresh air, 2 minutes later started to get warm again... and so it goes... doesn't stabilize..

It's not on auto, and I adjusted the temperature to the max (91F) to test it out.

Before it gets cold for real I need to fix this, and as usual people overcharge these types of things especially this time of the year where they know you dont have a choice. Has anyone gone through this and could help me out?

Very much appreciated!
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  #2  
Old 09-20-2019, 07:31 AM
dukedkt442 dukedkt442 is offline
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M54 or N52?

Coolant level check?
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  #3  
Old 09-20-2019, 07:42 AM
Raunylima7 Raunylima7 is offline
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Quote:
Originally Posted by dukedkt442 View Post
M54 or N52?

Coolant level check?
Its a M54, Coolant level is fine...
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  #4  
Old 09-20-2019, 08:51 AM
dukedkt442 dukedkt442 is offline
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Sporadic heat often can be traced to air in the system, sticking thermostat or heater valve, or can be a blend door problem in the HVAC control panel.
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Old 09-20-2019, 09:46 AM
Raunylima7 Raunylima7 is offline
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Originally Posted by dukedkt442 View Post
Sporadic heat often can be traced to air in the system, sticking thermostat or heater valve, or can be a blend door problem in the HVAC control panel.
Seems like the answer could te pretty obvious...
I'm just. Concerned about the hot air coming and going every 2-3 minutes. That means I still have some very hot air coming, but it just doesnt last long..

Dont know from where to start to looking..
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Old 09-27-2019, 05:57 AM
Raunylima7 Raunylima7 is offline
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[UPDATE] I noticed the the heater only gets hot when the car is running, when I stop a traffic light the temperature drops... any clue?
Seems like the pressure flow makes it work?
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Old 09-27-2019, 06:09 AM
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Doug Huffman Doug Huffman is offline
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Mein Auto: CPO2012 X5 35d M57(E70)
The Hot-Water Control valve(s) is normally open while de-energized and energized to shut against the flow. It may be throttled shut by a PWM from the IHKA.
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Old 09-27-2019, 06:22 AM
Raunylima7 Raunylima7 is offline
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Originally Posted by Doug Huffman View Post
The Hot-Water Control valve(s) is normally open while de-energized and energized to shut against the flow. It may be throttled shut by a PWM from the IHKA.
That sounds interesting, sorry to ask but how will I make sure it's that? Or any suggestions on how to proceed?
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Old 09-27-2019, 06:26 AM
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Doug Huffman Doug Huffman is offline
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Quote:
Originally Posted by Raunylima7 View Post
That sounds interesting, sorry to ask but how will I make sure it's that? Or any suggestions on how to proceed?
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Scepticism and Animal Faith (1923)
Scepticism is the chastity of the intellect, and it is shameful to surrender it too soon or to the first comer: there is nobility in preserving it coolly and proudly through long youth, until at last, in the ripeness of instinct and discretion, it can be safely exchanged for fidelity and happiness.
(The Works of George Santayana p. 65)

Eschew eristical argumentation. I am responsible for what I write, not for your understanding of it.
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  #10  
Old 09-28-2019, 03:50 PM
Raunylima7 Raunylima7 is offline
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Quote:
Originally Posted by Doug Huffman View Post
Quote:
Originally Posted by Raunylima7 View Post
That sounds interesting, sorry to ask but how will I make sure it's that? Or any suggestions on how to proceed?
www.NewTIS.info
Thank you
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  #11  
Old 10-04-2019, 06:09 AM
Raunylima7 Raunylima7 is offline
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Update:

Heater started to work regularly with no fix. Don't know if was just lack of use? Certainly not right but let's see how far it goes..

Thanks for the help!
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