S40 V40 Cars: - Heater blowing cold with new thermostat - Page 2

pierremcalpine · Dec 16th, 2012, 14:38

[QUOTE=V40 owner 12;1311142]Quick update. Just before I fitted a proper Volvo thermostat and temperature sensor I squeezed all the pipes and I now I have some heat. I have double the heat coming from the right hand vent on the dash only, and the center vents and left vent are cooler? Matrix issue? Anyway fitted the new thermostat and temperature sensor and flushed out the engine and renewed antifreeze. Sadly no change, due to 200k now if it's the matrix I'm leaving it well alone as I've read it's expensive Labour wise. Any thoughts on what you guys think I could try next?[/QUOte

Have you tried replacing the temp transistor/resistor under the glove compartment? It's a relatively cheap fix and could be related to your issue.

Also, I had a problem a while back where heat was either blasting or cold air was coming out full force - no in between. It turned out to be the temp damper motor which was no longer operating. I haven't seen much info on the latter issue in the forums so probably a bit of a long shot. I have read a couple of postings on the Matthews Volvo site though on how to verify that it is working. Might be worth reading and checking out. That part is pretty accessible as well.

Keep us posted.

Dec 16th, 2012, 14:38	#11
pierremcalpine Premier Member Last Online: Jan 3rd, 2024 14:43 Join Date: Feb 2012 Location: Toronto Canada	[QUOTE=V40 owner 12;1311142]Quick update. Just before I fitted a proper Volvo thermostat and temperature sensor I squeezed all the pipes and I now I have some heat. I have double the heat coming from the right hand vent on the dash only, and the center vents and left vent are cooler? Matrix issue? Anyway fitted the new thermostat and temperature sensor and flushed out the engine and renewed antifreeze. Sadly no change, due to 200k now if it's the matrix I'm leaving it well alone as I've read it's expensive Labour wise. Any thoughts on what you guys think I could try next?[/QUOte Have you tried replacing the temp transistor/resistor under the glove compartment? It's a relatively cheap fix and could be related to your issue. Also, I had a problem a while back where heat was either blasting or cold air was coming out full force - no in between. It turned out to be the temp damper motor which was no longer operating. I haven't seen much info on the latter issue in the forums so probably a bit of a long shot. I have read a couple of postings on the Matthews Volvo site though on how to verify that it is working. Might be worth reading and checking out. That part is pretty accessible as well. Keep us posted.

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