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20,702 Posts
Sorted a heater control valve issue about 18 months ago iirc , it was sticking so was either stuck cold or on hot postion .....
This eve i had evo idling for 10 mins as i faffed about with the new "go pro" camera ...had air con on to demist faster as it was frosty here all day ! Turned off that and noticed air wasnt as warm as it should be either way ....turned dial to cold ....then back to warm ......stayed cold !
Thinking its this control valve sticking i drove off and pulled in few mins later ......turns out the valve moves ok , yet still bloody cold air only !
Doesnt matter what postion ,face/windscreen etc or dial temp etc .......
Temp guage normal and plenty of coolant in expansion reservoir !
Left it at that after a spin , too dark n cold :angel:
Heater matrix fubared ? Will find where the pipes are behind engine going through bulkhead and see if they heat up with car running the next time im free over few days .......Ideas welcome ! :handsup:
This is heater control valve left of clutch pedal thats not the issue this time ;

This eve i had evo idling for 10 mins as i faffed about with the new "go pro" camera ...had air con on to demist faster as it was frosty here all day ! Turned off that and noticed air wasnt as warm as it should be either way ....turned dial to cold ....then back to warm ......stayed cold !
Thinking its this control valve sticking i drove off and pulled in few mins later ......turns out the valve moves ok , yet still bloody cold air only !
Doesnt matter what postion ,face/windscreen etc or dial temp etc .......
Temp guage normal and plenty of coolant in expansion reservoir !
Left it at that after a spin , too dark n cold :angel:
Heater matrix fubared ? Will find where the pipes are behind engine going through bulkhead and see if they heat up with car running the next time im free over few days .......Ideas welcome ! :handsup:
This is heater control valve left of clutch pedal thats not the issue this time ;
