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[cavman]

(Vauxhall Omega 2.5 (petrol)  CDX Salon)

I’ve got water collecting in the front passenger and near side rear passenger footwell, the water is defiantly connected with the Air conditioning, I had this problem 18 months ago and stopped using the air con and the problem went away but as the summer hols came I thought I’d try using the air con again ( I had to get the system re-gassed as I’d not used it in so long) anyway, after the air-con started working again I drove to Munich in dry weather and by the time I got there there was a puddle in the passenger footwell.


There are two tubes that drain off the evaporate from the air-con, one on each side of the ‘driveshaft’, these are both working on a flat surface, does anyone know where these tubes start? Do they run from inside the dash board? I’m guessing that some of the ‘evaporate’ is leaking behind the dash.

[PhilRich]

Check the passenger side Scuttle Drain. It will probably be full of leaves, water & other crap.

Failing that, you could have a problem with your Heater Matrix leaking :-/

[cavman]

Thanks for the quick responce! That was the first thing I checked after readin this forum last year. The car has no problems in the rain or car wash etc... just when the air-con is used.

Can I get to the heater matrix without taking out the dash board? I guess that will also mean dis-charging the air con :-(
I'd like to find out where those two discharge pipes originate.

Check the passenger side Scuttle Drain. It will probably be full of leaves, water & other crap.

Failing that, you could have a problem with your Heater Matrix leaking :-/

[PhilRich]

Thanks for the quick responce! That was the first thing I checked after readin this forum last year. The car has no problems in the rain or car wash etc... just when the air-con is used.

Can I get to the heater matrix without taking out the dash board? I guess that will also mean dis-charging the air con :-(
I'd like to find out where those two discharge pipes originate.

Check the passenger side Scuttle Drain. It will probably be full of leaves, water & other crap.

Failing that, you could have a problem with your Heater Matrix leaking :-/

Look here for Matrix removal. You do not need to discharge the Air Con system! 


http://www.omegaowners.com/forum/YaBB.pl?num=1262554909



Here is a diagram of the Omega Aircon system. I suggest you make a copy as it may not be on my photobucket page for too long

[PhilRich]

Cavman, are you losing any coolant? Do you need to top up the coolant expansion bottle at all?   :-?

[cavman]

Yes! Actaully I'm losing about a cup full a week!
But after a day long journey the footwell had about 1 litre of water in it ( the water is oderless and colourless).

Cavman, are you losing any coolant? Do you need to top up the coolant expansion bottle at all?   :-?

[Welung666]

Unlikely to be coolant then. Get the car somewhere dry and run a hose over the sunroof but keep it from running down the windscreen.

If the water level goes up then it'll be a sunroof drain.

[cavman]

Gave that a try before I got the air-con re-gassed and the floor was dry.

I wonder why there are two hoses for the condensate to come from, one on each side of the 'driveshaft' if they originate from the Evaporator which is located behind the glove compartment?

Unlikely to be coolant then. Get the car somewhere dry and run a hose over the sunroof but keep it from running down the windscreen.

If the water level goes up then it'll be a sunroof drain.

[PhilRich]

Gave that a try before I got the air-con re-gassed and the floor was dry.

I wonder why there are two hoses for the condensate to come from, one on each side of the 'driveshaft' if they originate from the Evaporator which is located behind the glove compartment?

Unlikely to be coolant then. Get the car somewhere dry and run a hose over the sunroof but keep it from running down the windscreen.

If the water level goes up then it'll be a sunroof drain.

What makes you think these two hoses are condensate drains? Is yours an Auto? if so could one of them possibly be the gearbox breather pipe? :-/

[cavman]

In the summer on a humid day there will be an almost constant dribble out of both hoses when on a flat surface.

My Omega is a manual.

What makes you think these two hoses are condensate drains? Is yours an Auto? if so could one of them possibly be the gearbox breather pipe? :-/

[cavman]

I've still got this issue. I had a further look and the two discharge pipes originate from the heater matrix but I can't think why the heater matrix would need drainage pipes, it's the Evaporator which needs them to get rid of the condensation that will form there.
On another website someone said it was a know issue and to look at ''VX Field Remedy (No 1390)', not sure what that means  :-?

[fiend61]

ok you say you have checked and cleared your scuttle?? can you put water in and none collects by pollen filter??
when the water collects does it collect in front passenger or rear passenger side?
if rear i would say its your scuttle or sunroof drains being blocked if front i would go for heater matrix but if you are not losing coolant then it shouldnt be that
if anything i cant seeing it being aircon no matter what you think

[cavman]

There is no doubt that this is related to the AirCon, I get it re-gassed each year in July and it usually works till October, it's only during these months that the front passenger footwell and the near side rear passenger footwell get wet under the mats, so throughout the rest of the year when the aircon no longer works it does not get wet no matter how much rain falls.

[fiend61]

i am not relating this to rainfall etc , i am asking you if you pour water into your scuttle does it come out as fast as you put it in? which passenger side footwell fills first?
im sorry but i cant see aircon condesate putting a litre of water in your footwell

[cavman]

When I was first looking for a leak I had a hose pouring water into the cabin air intake area, the scuttle valve coped.
When I say the passenger footwell fills with water I really mean you have to push down on it some clear, clean water comes up through the two holes for the mat, the only time there was puddle of water was when I drove down to Munich on a humid August day, I had a cardboard box sitting on the mat in the rear near side passenger footwell and the box was unusable when I got there.
If I look under the car on a humid day with the aircon on there is a constant dribble of water from the two pipes on either side of the transmission, I was wondering if driving at motorway speeds somehow causes the drain to stop working ( maybe due to the air under the car being higher pressure than that at the air intake??) this causes the condensation to overflow around the evaporator.