Steamy windows - not coming from body heat.

[MarshPhantom]

Noticed over the last few days that the windows have been fogged up while my Merc C124 was been parked on the drive. Would I be right in thinking that there must be some water getting in somewhere. Never noticed this before now and we have had a lot of rain.

[eybic]

Could it be that the air is really cold at night then the sun shines on it first thing, heating the air up creating condensation?

[MarshPhantom]

It could be, I shall monitor the situation.

The carpets aren't wet/damp, and I can't see how water could be getting in.

[renaultgeek]

I have a little thing of dehumidifier crystals that I bought for 2 quid that I keep in my mx5, does the job of keeping the damp out.

[MarshPhantom]

Thanks, I'd not heard of those, I'll try and get some. Mine is the coupe not the cabrio so it's a bit of chin scratcher.

[pmessling]

wilkinsons do the dehumidifer gel packs. I use them in my TVR, but to me sounds like water getting in somewhere only needs a small amount.

[grumpy52]

Any damp clothing or footwear in the car ?

[dbdb]

It does sound like there is water getting in somewhere. I imagine there is a lot of sound insulation in one of these. This can soak up quite a bit of water before you get wet carpets.

[Stegel]

Check all the drain points- I have a cabrio and one of the scuttle drains (there are 4) was blocked (a wiper nut and a couple of inches of leaf mould- two exit in the wheel arch, the others fall either side of the gearbox) plus one of the sill drains (base of the front wing). Once cleared it was a lot better - although it's not 100% water tight, and as it is currently staying outside while the garage is rebuilt, I bought a half-car cover which covers the scuttle and the boot's front edge, and makes a big difference.

[healeyfan]

Check that the plastic membrane inside the doors is not damaged or missing. This is usually a cause of condensation inside the car if there isn't an obvious ingress of water.

[MarshPhantom]

Thanks a lot for all the replies, I shall do some investigation.

Re. the plastic sheeting in the door, I had to take the door trim off the nearside door to repair the window mech a while age and noticed that the sheet on that was in a bit of a state. I did what I could to repair that but maybe the driver's side needs doing to.

Cheers.