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Heater blowing hot and cool

Kieron

Member
Joined
Jun 18, 2016
Messages
145
Country Flag
uk
Probably another stupid question from me but why does my heater blow hot as requested then after a while turn cooler and then back to hot. My wife duly notifies me of this every time it occurs
Cheers all
 
I think you must be mixing up your wife with your heater. Sounds familiar.



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Can't say anything specific, but there is a temp sensor under the dash (behind a tiny grille at my right knee (LHD) - I suppose that would be passenger right knee in a RHD). This sensor has a habit of falling off when any work is done in the area, and end up dangling close to the air outlet. Or that it gets disconnected from the plug and not replaced.

There are also cases of failing mixer valves.

And then it could be low coolant level - or otherwise air in the system.
 
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