T5 in Mist

[RGM200]

Morning all, have a new problem.

I have an 854 T5 on an M plate, and whe I turn the heater controls from cold to warm/hot I get a nice mist pooring out of the air vents, its like an eerie scene from a horror film.

Air con works beautifully, when the heater controls are on cold it all works lovely, just when I turn it to warm/hot.

Any ideas, has the heat eachanger gone??

Any help or advice greatfully appreciated

[Wobbly Dave]

Does the aircon blow nice and cold all the time? IIRC the only time it happened to me was after I had just had the A/C regassed.

[RGM200]

Yes the air con is ice cold, was overhauled about 8 months ago and still runs beautifully