Heater blowing cold at low speed

[jbrady72]

My heater has started playing up and at low speeds, tends to be below 40ish, the heater blows just cold air even when on Max heat, then as I speed up, give it a minute or 2 and it'll blow nice warm air again!
Head gasket and water pump was done a year ago so can't really be that.
Also no set carpets so not heater matrix, maybe it is?

Helpppp it's really annoying :homme:


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[jbrady72]

Anyone??


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[danny-vts]

Thermostat
re-bleed coolant system

[stevo67]

Air lock,bleed system.

[saxokid100]

Sounds like air lock to me...

[jbrady72]

Awesome! Will try bleeding it! :)


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[Gandi699]

chuck a new thermostat in it, sounds like it stuck open

[jbrady72]

chuck a new thermostat in it, sounds like it stuck open


Was thinking this but it had a new one about a year ago too


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[Gandi699]

could still be duff, try it in a pan of boiling water before spending any money. As you've said the water pump is good it sounds like its going a bit cold at idle due to the open stat then once you get the pump speed up a bit warm coolant can flow into the matrix again and you get heat

[Samuel]

Was thinking this but it had a new one about a year ago too


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You can tell if its stuck open. Do the hot water test to see if its stuck closed

[Ben_SaxoForte]

Most likely an air lock