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Heater Blowing Cold Even With New Heater


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#1 Josh_091


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Posted 01 February 2020 - 04:33 PM

Hi sorry if this has already been covered but basically my heater isn’t blowing hot air, it’s not freezing cold and it’s warmer than when I have the valve pulled fully out but it’s still not warm enough to heat the car.
I have put in a new heater matrix and a new valve and it doesn’t appear to have helped much however a new radiator has also been recently installed so not sure if this would effect how hot the heater gets.

Any help is much appreciated thanks

#2 Ethel


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Posted 01 February 2020 - 04:45 PM

Valve on the head or the remote type?


Easiest thing to check is if the thermostat is working - does the top hose get warm as soon as the temp gauge moves?

#3 phillrulz


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Posted 01 February 2020 - 05:22 PM

Could be airlock , and most minis need more than idle revs to pump water through the heater 

#4 Quinlan minor

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Posted 01 February 2020 - 05:53 PM

Check the hoses to and from the heater, the one ‘to’ will warm soonest. Disconnect the 'from' and backfill the pipe with a watering can, or similar. That should solve an airlock.

Edited by Quinlan minor, 02 February 2020 - 12:13 PM.

#5 Rorf


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Posted 02 February 2020 - 10:24 AM

Check that the thermostat is working correctly.

#6 Twincam


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Posted 02 February 2020 - 11:36 AM

Is the valve opening fully also?

#7 Josh_091


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Posted 04 February 2020 - 01:59 PM

Hi sorry to get back late but just checked the pipe and wasn’t much water in it so I think it may have been an airlock, thanks for the replies everyone

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