Heating not working

tomweston · Apr 24th, 2015, 08:17

My 2010 S40 1.6D drive has always had good heating from cold until this week when the drivers side just blows cold air until the engine is hot.
I have assumed that there are auxiliary heaters, one for each side, built into the air system. Does anybody know if there are fuses and temperature sensors for each auxiliary heater and if so where are they?
I have checked if the temperature settings on the dash are correct.

Any thoughts on this much appreciated.

Welton · Apr 24th, 2015, 09:12

Many modern diesel cars have electrical resisters fitted to the heater matrix to input heat into the cabin until the engine's coolant is hot enough; there's only one common heater matrix and the left/right split is done using air flaps to regulate the temperature.

You could try setting both sides to the same temp and running the temperature control slowly down to 'Lo' and then slowly back up to 'Hi' then returning to normal preferred temp. This has proven before to reset the left/right calibration but if not you might find it'll need the codes read or a software update (hopefully not though).

See how you get on.....

tomweston · Apr 24th, 2015, 10:12

Thank you for the reply, I will have a try doing what you suggest.

tomweston · Apr 27th, 2015, 08:57

Your suggestion worked, thank you.

Welton · Apr 28th, 2015, 07:21

Great thanks for the update.

Apr 24th, 2015, 08:17	#1
tomweston Member Last Online: Aug 26th, 2019 10:17 Join Date: Aug 2014 Location: Knutsford	Heating not working My 2010 S40 1.6D drive has always had good heating from cold until this week when the drivers side just blows cold air until the engine is hot. I have assumed that there are auxiliary heaters, one for each side, built into the air system. Does anybody know if there are fuses and temperature sensors for each auxiliary heater and if so where are they? I have checked if the temperature settings on the dash are correct. Any thoughts on this much appreciated. Last edited by tomweston; Apr 24th, 2015 at 08:18. Reason: spelling mistake

Apr 24th, 2015, 09:12	#2
Welton Premier Member Last Online: Sep 14th, 2021 17:03 Join Date: Feb 2009 Location: Market Harborough	Many modern diesel cars have electrical resisters fitted to the heater matrix to input heat into the cabin until the engine's coolant is hot enough; there's only one common heater matrix and the left/right split is done using air flaps to regulate the temperature. You could try setting both sides to the same temp and running the temperature control slowly down to 'Lo' and then slowly back up to 'Hi' then returning to normal preferred temp. This has proven before to reset the left/right calibration but if not you might find it'll need the codes read or a software update (hopefully not though). See how you get on..... __________________ 2005 S40 T5 SE - Manual. Bilstein B4's. (For Sale) 2010 Citroen C4 1.6 HDi (bizarre Gearbox model). 2010 Renault Twingo (refreshingly simple) 2018 Infiniti Q30 1.6T Business Executive (what's this button do?)

Apr 28th, 2015, 07:21	#5
Welton Premier Member Last Online: Sep 14th, 2021 17:03 Join Date: Feb 2009 Location: Market Harborough	Great thanks for the update. __________________ 2005 S40 T5 SE - Manual. Bilstein B4's. (For Sale) 2010 Citroen C4 1.6 HDi (bizarre Gearbox model). 2010 Renault Twingo (refreshingly simple) 2018 Infiniti Q30 1.6T Business Executive (what's this button do?)

Apr 24th, 2015, 10:12	#3
tomweston Member Last Online: Aug 26th, 2019 10:17 Join Date: Aug 2014 Location: Knutsford	Thank you for the reply, I will have a try doing what you suggest.

Apr 27th, 2015, 08:57	#4
tomweston Member Last Online: Aug 26th, 2019 10:17 Join Date: Aug 2014 Location: Knutsford	Your suggestion worked, thank you.

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