Hi all, i've read a lot of problems regarding heater on Fabia I, but nothing like mine (i guess).

I usually turn the dial to maximum hot position with A/C off. If i start the fan with speed number one or two it blows hot air. If i put the fan speed dial to 3 or four the air gets warmer.

Any idea? I've just replaced the evap fan sensor.

With A/C things get worse, it's always warm/cold in hot

It could be a heater flap problem or it could be a coolant circulation problem where the coolant isn't getting pumped through the heater quick enough. A fault code read should reveal any faults with the heater flaps.

No heater flaps errors are stored in the H/AC Channel. I can also manage to reset the flaps trough VAG-Com. May be coolant circulation modification for the LPG system installation as f****d all the things? :\

I was about to suggest a blocked/dirty heater matrix, but if your cooling circuit has been modded for LPG (why?) then that could well explain it.

the cooling system is used to heat the "reducer" a small tank where the LPG expands before going to the injectors :\ . How can i check the heater matrix? Where is it?

Edited 29 November, 200817 yr by --Xeno--

The heater matrix is the heat exchanger buried behind the heater controls - not an easy check, but also unlikely to be blocked unless you've been running without a pollen filter. I would say the cooling system mod is more likely to be your problem. Does the LPG reducer get heated before the cabin? Could it be routed the other way round?

The heater matrix is the heat exchanger buried behind the heater controls - not an easy check, but also unlikely to be blocked unless you've been running without a pollen filter. I would say the cooling system mod is more likely to be your problem. Does the LPG reducer get heated before the cabin? Could it be routed the other way round?

A pollen filter will have nothing to do with a blocked matrix, if you getting poor heating it will be blocked internally an reducing the flow. Sounds to me like the LPG might be restricting the flow to the matrix.

A pollen filter will have nothing to do with a blocked matrix, if you getting poor heating it will be blocked internally an reducing the flow. Sounds to me like the LPG might be restricting the flow to the matrix.

I would have thought that a missing pollen filter would let all the leaves and crud through to the matrix, preventing effective heat transfer.

So sounds like there's nothing to do, luckily i live in Sicily and the weather is quite good also during the winter . The only problem that i have is when i need to unfog the windscreen quickly :\ i have to use the A/C

hey guy's. . this sounds like somebody could help me. . . my Fabia VRS heater randomly goes from cold to red hot air and cant get rid of it from doing it but then randomly goes back to cold again. . . .

Any Idea's???