Heaters

[Durty-Sanchez]

My heater used to be quite good, but of late it has become very very average (i.e. luke warm at best). I figured it was something clogging up the heater core pipes so I gave it a bloody good flush, and at the end the flow through it was quite good. Removed all the air locks, but still.. it's just crap! Aside from removing the whole rotten dash to replace the core itself, what can be done? Anyone know what causes it to just pack up like that?

Thanks

[Swindog]

May have a radiator leak as in pressure leak.

Noticed any water loss from the system at all? Thermostat could have packed in too.

[Flash]

Sounds like it might be the heater control unit. (the part with the controls on it)

Try a freinds unit for a quick test

If this does not work then check to make sure all the linkages & flaps open coreectly you might need to remove glovebox etc & if this does not work wear a snow jacket!

[Durty-Sanchez]

Heater control works well, that was my first guess but I have 2 units now and both give the same result. All the actuators and stuff move too, so I don't think that's it. At low enough fan speed the heat is decent, just when you speed it up it really cools down. It's like not enough heat is making it from the coolant pipes to the heater fins. No coolant system problems either.. bit of a mystery. I remember someone mentioning that they just stop working for no reason, only way to fix it is to replace the core, just wondered if anyone had any light to shed on why it happens, or if you can reverse it