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View Full Version : heater wont blow hot air!!


koztek55
24-04-2010, 10:59 PM
just go my mk2 back after a while, the fans still work, and aircon, but the heater wont blow hot air, kind of frustrating with melbourne weather being inconsistant:mad:, any ideas??
DUB 20V
24-04-2010, 11:53 PM
id take a stab at heater core....
Bboy_Sparx
25-04-2010, 12:12 AM
Thermostat
sports racer
25-04-2010, 03:06 AM
Get the car up to operating temperature, open the bonnet and feel the two rubber pipes that go from the motor to the firewall (and on the the heater). The pipes are about 2cm in diameter. Both of them should be warm/hot. If not, the water isn't going through your heater and you won't get any heat out of it.

If only one is warm you've got a blockage somewhere that isn't letting hot water flow through the heater and out via the 2nd rubber pipe.

Cheers

Paul
koztek55
25-04-2010, 09:06 AM
cheers guys i will check that out today.
Spyda
25-04-2010, 06:12 PM
We checked it and both heater core pipes get hot but still not hot air.
VwJunkie
25-04-2010, 06:27 PM
We checked it and both heater core pipes get hot but still not hot air.

Are you losing any coolant at all? Maybe the heater flap is broken, is it still blowing cold air when you switch it to hot or does it change a little? I think the heater flap in the golf is vacuum fed so possible a leak or a broken flap...
Bboy_Sparx
25-04-2010, 06:35 PM
Are you losing any coolant at all? Maybe the heater flap is broken, is it still blowing cold air when you switch it to hot or does it change a little?.

The flap is a common problem from what I hear. This has happened to mine ARGH
VwJunkie
25-04-2010, 06:54 PM
The flap is a common problem from what I hear. This has happened to mine ARGH

Yeah i know we are having a few probs with them on the falcons so most likely to be the same problem here, gonna be a dash out job to get to it :(
koztek55
27-04-2010, 07:50 PM
Thermostat

i rekon you my be right, when the car idles in traffic and warms up to half, the heater blows hot air, when i start to drive the temp gauge cools all the way down to the bottom, and the heater goes cold.
robiom
04-08-2010, 09:13 PM
Hello,

My Mk2 was exactly the same.
New heater core - no change
New Thermostat - no change (but temp guage now steady)
Replaced hot / cold air vent flap material - no change

Rip out the Valve added for Mk2 heater recall - replace with copper plumbing pipe and it's now too hot.

I can see the coolant system "residue" that has blocked and seized it up.

Just need Air con regas for summer now :)