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[dbug]

Entwood, it might be worthwhile checking for damp/wetness under the passenger mat/carpet? I'm having problems there now from out of nowhere & need to check sunroof drains, leaking screen etc. when the opportunity arises, hth

Bone dry ... and thats a symptom of a blocked scuttle drain...

http://www.omegaowners.com/forum/index.php?topic=90535.0

So can a leaking heater matrix 

[Entwood]

Everything has been checked, all carpets/soft furnishings bone dry, all vents/drains clear.

Car will be perfectly OK most of the time, but if it gets damp .. mist/fog/rain and coldish .. below 5 .. then she'll steam up ...

Sticking demist on clears it, but turn demist off and after 5 minutes its back

Crack the sunroof a fraction, or open a window a fraction and all remains clear ... which is why I was thinking recirc flap....

Playing around today after changing oil / filter .....

Air con compressor runs fine and switches off when eco selected as it should .. now going by the two "gas connections" ..... the "thicker" pipe, although it gets cold(ish) does not seem to get as cold as it used to.... the "thinner" pipe stays quite warm.

Question then ... if the aircon needs a recharge .. would a low efficiency cause this steaming up problem The aircon is "supposed" to cool the air to remove moisture before heating it back up as it enters the cabin ... if it's not cooling enough .. is the air still "moist"

Any ideas ??

I'm thinking of just taking it to an aircon place and getting it checked ..... 

[Andy B]

Everything has been checked, all carpets/soft furnishings bone dry, all vents/drains clear.

Car will be perfectly OK most of the time, but if it gets damp .. mist/fog/rain and coldish .. below 5 .. then she'll steam up ...

Sticking demist on clears it, but turn demist off and after 5 minutes its back

Crack the sunroof a fraction, or open a window a fraction and all remains clear ... which is why I was thinking recirc flap....

Playing around today after changing oil / filter .....

Air con compressor runs fine and switches off when eco selected as it should .. now going by the two "gas connections" ..... the "thicker" pipe, although it gets cold(ish) does not seem to get as cold as it used to.... the "thinner" pipe stays quite warm.

Question then ... if the aircon needs a recharge .. would a low efficiency cause this steaming up problem The aircon is "supposed" to cool the air to remove moisture before heating it back up as it enters the cabin ... if it's not cooling enough .. is the air still "moist"

Any ideas ??

I'm thinking of just taking it to an aircon place and getting it checked .....

I don't think your a/c is working as it should ie low on gas. It's very easy to have enough gas for the compressor clutching in & out but with not enough in the system for it to work correctly. 

[feeutfo]

Boot cupboard vent clear?

Specialist otherwise.

[Entwood]

Boot cupboard vent clear?

Specialist otherwise.

Empty

As a check .. 

[Kevin Wood]

I wouldn't expect the air con pipes to be getting that cold in this weather as the refrigerant flow is controlled by the temperature of the evaporator. In other words, low outside air temperature means it won't be doing much. A temperature differential between the high and low side plumbing means it's doing something.

I could be wrong, though. I'd wait until summer to get it re-gassed as doing it in hot weather means vac'ing it out will be more effective at removing any moisture in the refrigerant circuit.

[Entwood]

I wouldn't expect the air con pipes to be getting that cold in this weather as the refrigerant flow is controlled by the temperature of the evaporator. In other words, low outside air temperature means it won't be doing much. A temperature differential between the high and low side plumbing means it's doing something.

I could be wrong, though. I'd wait until summer to get it re-gassed as doing it in hot weather means vac'ing it out will be more effective at removing any moisture in the refrigerant circuit.

Temp today when I did the oil change was around 12-15 C and i set the air con at LO for 30 minutes ... would have thought that would make the pipes cold ?? Temp at the vents didn't go below 8 C , although the probe I use has not been calibrated.

Trouble with waiting 'til summer is that the in damp/cold weather it steams up so quickly its almost dangerous,... and driving with sunroof/window cracked is both noisy and cold !!!

If I get time tomorrow I think I'll get it regassed .. if not 'twil be next Thursday

[Kevin Wood]

I'm not convinced that's the problem, TBH.

I drive mine around on ECO this time of year and very rarely get problems but no harm in getting it gassed if it's not been done for a while.