ScoobyForLife27

iTrader: (14)

Hi guys.
Both, top and bottom rad hoses are hot, header tank hoses as well, blower works perfectly but there is no hot air !!!
No matter how long the engine is running it keep blowing cold air even when set hot.
The other day blower stopped working completely and found out burned fuse, changed it and it's fine apart from not blowing hot air.
The other thing I've found was the heater matrix wire that was getting hot when blower was on ! So that caused fuse burn. It is not actually whole wire, it's the only that short bit (don't know why but it's not one piece wire, it is extended by the same thickness wire and plugged together if you know what I mean ? )

Thank You

Steve's Sti

iTrader: (2)

Does the car have the heater control valve?

ScoobyForLife27

iTrader: (14)

Hmm ??? Good question mate. Never had a problem with heating before so... Have no idea really.

Steve's Sti

iTrader: (2)

Not too sure of the layout on a classic but worth a look if it has one, ive had it go on another car, the valve sticks closed stopping flow, was the whole matrix warm?

ScoobyForLife27

iTrader: (14)

But what really makes me think is that wire. Why is getting hot and blowing the fuse ??
And why is it only hot on that short section from plug to plug ?

ScoobyForLife27

iTrader: (14)

Didn't check if matrix was hot as well. Can't do it now as have no car ATM :-(
Could understand if bottom hose was cold so at least will know that there is an air lock.

Steve's Sti

iTrader: (2)

Not good hopefully just be quick fix

Don Clark

Temperature is controlled by flaps that regulate the air flow across or bypass the matrix. The heater matrix is a full flow item and has no water shut off valve.

Would think one of the operating control wires or levers has become detached leaving the flaps in the wrong position.

As for a wire getting hot - thats whats supposed to happen. It's a speed control resistor (item22 on first link below)

http://opposedforces.com/parts/impre...llustration_2/

http://opposedforces.com/parts/impre...llustration_3/

http://opposedforces.com/parts/impre...llustration_1/

http://opposedforces.com/parts/impre...llustration_1/

http://opposedforces.com/parts/impre...llustration_2/

ScoobyForLife27

iTrader: (14)

Thanks a LOT Don :-)
So the only solution is to remove/open the whole heater matrix, right ?

ScoobyForLife27

iTrader: (14)

A friend of mine told me to start from checking heater core as is a chance that there is a blockage and there is no circulation.

Don Clark

You can check the wire cables and links by dropping the lower parts of the dash and looking at their operation when you move the heater controls.

A number of people have found arms have dropped off/come loose before..........


If the core is blocked (I would think, not likely) you can back flush it by disconnecting the inlet/outlet hoses at the back of the engine

ScoobyForLife27

iTrader: (14)

Hmmm... Didn't think about heater controls. It's possible as recently removed the dashboard a couple of times due to roll cage fitting. I will have a look tomorrow. Only top, main part of the dash is fitted ATM so will be very easy to check that.
Thanks a lot mate !

ScoobyForLife27

iTrader: (14)

The roll cage I've bought came with dash already pre cutted so didn't have to damage mine one. Only thing I had to do, was to swap everything round (wire looms, controls etc) so I wouldn't really be surprised if something went wrong by doing this :-)