Heating unit not working properly

**MJawa 55** · 03-11-2007

Hi Dan,

I seem to have a problem with my heating unit, for some reason its not working properly. For example 3 weeks ago when it was freezing here in London I used to put my heater on 23 C and the power on 4 and i used to feel hot, now the weather is 14 C in London and i have to put the heater on 26 C and full power just to feel warm. i took the car to MB west hampsted and they told me that there is noting wrong with the heater i explained the situation and brought my cousins E63 and showed them the difference they told me that there is nothing wrong that how the automatic thing i the heater/ac works. i know there is something wrong but i dont know if it could be a sensor or the heating unit?

regards,

Mohammed Jawa

**DansSlk** · 03-11-2007

Well if we say your engine's operating at the same temperature then the only part that controls the flow of hot water is the duo valve if its not working properly then it wont respond to signals correctly and could be not opening as much as needed.

There's really not much else it can be to be honest mate, have you tried using auto with the temp setting you want and see how the car behaves.

**MJawa 55** · 03-11-2007

i have tried that but it still doesnt do anything. should i take the car to the amg center in chiswick?

**DansSlk** · 03-12-2007

Nah that wont make any difference mate there ain't nothing AMG about the HVAC system its the same as the rest of the SLK's sounds like you have a faulty duo-valve or a blower not working correctly and your having to pump up the heat to compensate.

Get the dealer to check all the activations and that will tell them if everything is working correctly if it reports everything is ok there's not much i can suggest you could have them manually check the blower is alright and the same for the duo-valve but to be honest there's not much to go wrong.

Maybe just get the heater box and stuff checked for leaks.

**MJawa 55** · 03-12-2007

ill have them do that, thanks for all the help mate.

Regards,

Mohammed Jawa

03-11-2007	#1 (permalink)
MJawa 55 Senior SLK World Member Join Date: Oct 2006 Location: Paris, London, Cannes, Jeddah, Dubai Vehicle: SLK55 AMG Posts: 155 Country: Thanks: 23 Thanked 4 Times in 4 Posts	Heating unit not working properly Hi Dan, I seem to have a problem with my heating unit, for some reason its not working properly. For example 3 weeks ago when it was freezing here in London I used to put my heater on 23 C and the power on 4 and i used to feel hot, now the weather is 14 C in London and i have to put the heater on 26 C and full power just to feel warm. i took the car to MB west hampsted and they told me that there is noting wrong with the heater i explained the situation and brought my cousins E63 and showed them the difference they told me that there is nothing wrong that how the automatic thing i the heater/ac works. i know there is something wrong but i dont know if it could be a sensor or the heating unit? regards, Mohammed Jawa __________________ M. Jawa 2006 SLK55 AMG

03-11-2007	#2 (permalink)
DansSlk Dude Join Date: Jun 2006 Location: Wales Vehicle: 05 B55S (Brabus 6.1 S) Posts: 6,801 Country: Thanks: 99 Thanked 236 Times in 180 Posts	Well if we say your engine's operating at the same temperature then the only part that controls the flow of hot water is the duo valve if its not working properly then it wont respond to signals correctly and could be not opening as much as needed. There's really not much else it can be to be honest mate, have you tried using auto with the temp setting you want and see how the car behaves. __________________ One thing you will learn with German cars - If it's simple it ain't happening.

03-11-2007	#3 (permalink)
MJawa 55 Senior SLK World Member Join Date: Oct 2006 Location: Paris, London, Cannes, Jeddah, Dubai Vehicle: SLK55 AMG Posts: 155 Country: Thanks: 23 Thanked 4 Times in 4 Posts	i have tried that but it still doesnt do anything. should i take the car to the amg center in chiswick? __________________ M. Jawa 2006 SLK55 AMG

03-12-2007	#4 (permalink)
DansSlk Dude Join Date: Jun 2006 Location: Wales Vehicle: 05 B55S (Brabus 6.1 S) Posts: 6,801 Country: Thanks: 99 Thanked 236 Times in 180 Posts	Nah that wont make any difference mate there ain't nothing AMG about the HVAC system its the same as the rest of the SLK's sounds like you have a faulty duo-valve or a blower not working correctly and your having to pump up the heat to compensate. Get the dealer to check all the activations and that will tell them if everything is working correctly if it reports everything is ok there's not much i can suggest you could have them manually check the blower is alright and the same for the duo-valve but to be honest there's not much to go wrong. Maybe just get the heater box and stuff checked for leaks. __________________ One thing you will learn with German cars - If it's simple it ain't happening.

03-12-2007	#5 (permalink)
MJawa 55 Senior SLK World Member Join Date: Oct 2006 Location: Paris, London, Cannes, Jeddah, Dubai Vehicle: SLK55 AMG Posts: 155 Country: Thanks: 23 Thanked 4 Times in 4 Posts	ill have them do that, thanks for all the help mate. Regards, Mohammed Jawa __________________ M. Jawa 2006 SLK55 AMG

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