Hi All,

The heater on my MK1 GT does not seem to work. I can adjust the dial all I like but only cold air seems to come out? Is it a fuse or sensor gone?

Thanks

DanGT

PUNTO GT | BAILEY DV26 | K&N 57I | RAGE 4" ROUND SINGLE EXIT EXHAUST | PIONEER ICE | 140 BHP EST | 0-60 HIGH 7

the hot cold adjuster knob has a cable conected this opens and closes a valve on the heater tubes under the bonnet. turn it to cold have a look where the valve is, turn to hot and see if it has moved. or get someone else to turn knob back and forth while you look to see if its moving.
How often do you have to top up the coolent? because it could be that you need a new heater matrix common problem on puntos.

First thing to do is work out if water is getting into the heater matrix, after a little drive check the 2 pipes at the back of the engine that connect to the centre of the bulkhead (this passes through the bulkhead and joins to the heater grid).

If these are hot you could try removing the bleed screw on the right hand hose and clamping it a bit nearer you, if water comes out it is passing through the matrix OK.
Careful though, the water is obviously gonna be very hot.

If its not coming through it could be blocked with limescale, calcified coolant or radiator leak fixing fluid. Not much you can do apart from pay extortionate cash to get it changed.

If the water is hot and passing through the matrix the only thing left is the heater baffle. You will need to sit upside down on the drivers seat with your head in the footwell looking up behind the heater controls. As you turn the heat adjustment dial you will see a rod and a wheel move, this moves the baffle and lets the hot air through. Its not easy without taking the centre console out but you will have to work out what has broken/come loose and replace it.

I doubt it will be low coolant, if it got to the point it didn't pass through the matrix the car would be serverely overheating.

Hope it helps.


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Evil-Punto AKA Evilution.