Heater

[Quattro123]

Engine is at normal operating temperature
Interior heating warm just
Windscreen demist stone cold

[john.p.clegg]

airlock
flaps positioning
Flap seals


John

[RobMc]

Hi,

I agree with John.

I recently had the same problem with my heater after firing the engine up for the first time in 20 years. The engine was up to temperature but nothing from the heater. It turned out to be an air lock and the heater now nearly takes the skin off your legs when up to temp.

The only other possibilities might be a blockage or a faulty heater valve?

Rob.

[Quattro123]

Heater hose in hot
Heater hose out warm
But air still cold onto windscreen

[john.p.clegg]

Flaps positioning
Flap seals

John

[smo17003]

If the sponge seal around the heater core has disintegrated over time them the airflow into the heater box will take the easiest route i.e. around the core and not through it.

Cheers

Mike

[john.p.clegg]

...not forgetting the rubber/neoprene seals on the flap edges..

John

[alan.barker]

Is it an Elan or Plus 2.
Different Systems.
Alan

[Quattro123]

Plus 2

[alan.barker]

I think if you take both Heater hoses off at the Engine end. Then flush through using Garden hose pipe. Reconnect low Hose to Engine near Dissy. Fill other Hose so Heater is full. Fit Hose to Thermostat Housing.
Run Engine.
I had this problem before and was the fix.
Good luck
Alan

[Quattro123]

OK great will give it a try hanks

Bart

[Bigbaldybloke]

Years ago mine was similar, flushing it out was the cure, got brown lumps coming out like small Maltesers! Worked fine after that!