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Model specific boards => Golf mk2 => Topic started by: Whysub on 10 April 2005, 19:39

Title: Heater Problem?
Post by: Whysub on 10 April 2005, 19:39

Odd, but the heater on my newly acquired 1.6 8v works fine, but as soon as the temperature gauge gets to halfway, it only blows cold air. When the gauge drops a little, it blows hot again.

Checked the cooling system for leaks (none) and the oil/water for signs of water/oil, but all fine. A 200 mile round trip on motorway and stop start traffic showed no cooling faults.

Summer is coming, so it will not be a problem, but would like to know why it does this. Is it simply the thermostat?

Title: Re: Heater Problem?
Post by: robiwill on 10 April 2005, 21:17

its the heater bypass valve that is blocked take it off and clean it, if that doesnt cure it then you need a replacement

Title: Re: Heater Problem?
Post by: Whysub on 14 April 2005, 17:37

Thanks-at least I have a place to start the investigation.

Title: Re: Heater Problem?
Post by: Organisys on 14 April 2005, 21:44

Check for airlocks.

Set heater to max hot with fan on also.
Run car from cold with coolant expansion tank cap off.
Massage all coolant hoses (including heater send) hose
Air bubbles will rise up through tank.
Wait for coolant to nearly boil.
Stop engine
Wait for coolant to cool right down,
Top up coolant if needed. Replace cap.

Worked on mine.

Title: Re: Heater Problem?
Post by: diagnosis-dub on 15 April 2005, 14:17

Quote from: robiwill on 10 April 2005, 21:17

its the heater bypass valve that is blocked take it off and clean it, if that doesnt cure it then you need a replacement

Spot on. you know it makes sense :wink: