Heater problem

[Saul 0]

Hi All

The heater on my 1990 16v Corrado stops working (blowing hot air) after

20mins or so ,especially in slow town traffic, any ideas why ?

It will start working again if I stop the car and leave it for a while.

 

Cheers

Saul

[Supercharged 2]

Does it stop blowing completly or blows cold air??

[Saul 0]

Blows cold

[Supercharged 2]

Air lock maybe? - when you say in traffic, does the water temp go up or down at all?

[Saul 0]

No, water temp seems OK.

One thing I thought it might be is a valve that is attached to the water hoeses in the engine bay before they go into the heater matrix, think it is some kind of safety valve, I had one quit on a mk II Golf Gti, in that case it just closed and the heater would not work at all.

 

cheers

Saul

[Supercharged 2]

Yeah, I think they close if the matrix loses pressure (ie has a leak) not sure if they could stick closed and then open again, maybe worth changing the valves if you think the matrix is ok and refreshing the coolant.

[Saul 0]

Thanks, do you know if the valve works on temperature ?

[RACK 0]

The same has happened on my G60. Not good in this weather!

[Rossco 0]

yeh apparently these valves are quite prone to failing, i think this has happened on my G60 as well

[RACK 0]

Anyone got a pic of the valves? Also are they a pain to fix?

[Henny 0]

they're pretty easy to replace (if a little expensive) You just need to disconnect the 4 hoses and connect 'em to the new valves. It's the BIG chunk just by the bulkhead in the engine bay with the 4 waterpipes connected to it, 2 of which go through the bulkhead just to the right of the head as you look at it from the front of the car. You CAN'T miss it! ;)