Disco 1 Heater blowing hot and cold?

DiscoLyle · Jan 29, 2020

Evening chaps
I Experiencing a problem with my 300tdi Discovery.
When I start the car and let the car get up to temperature the heater is stone cold. Then all of a sudden it will get warm. Then it flutters between cold and warm every few minutes?
Any ideas ? Thermostat perhaps?

discool · Jan 29, 2020

DiscoLyle said:
Evening chaps
I Experiencing a problem with my 300tdi Discovery.
When I start the car and let the car get up to temperature the heater is stone cold. Then all of a sudden it will get warm. Then it flutters between cold and warm every few minutes?
Any ideas ? Thermostat perhaps?

hi again.
If as you say the engine is up to temp then the thermostat is okay, the stat is not involved with the flow of coolant through the heater, is it likely that there’s an air blockage in the heater matrix, have you recently changed the coolant?

Stanleysteamer · Jan 29, 2020

There was a thread on here recently similar to this, but if Search is stil fu cked, good luck in finding it.
Seem to remember the solution was to drain the system then refill it slowly and properly, but may have misremembered!
Bizarrely if you go out of LR and search using Google, much as you would on here, you often find what you need! Often on LR.

DiscoLyle · Jan 29, 2020

discool said:
hi again.
If as you say the engine is up to temp then the thermostat is okay, the stat is not involved with the flow of coolant through the heater, is it likely that there’s an air blockage in the heater matrix, have you recently changed the coolant?

The engine temp gets to halfway up the gauge like normal. No perhaps the whole system could do with a flush and refill

Disco 1 Heater blowing hot and cold?

DiscoLyle

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discool

Well-Known Member

Stanleysteamer

Well-Known Member

DiscoLyle

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