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Author Topic: Air Con blows cold air ONLY!!!  (Read 3168 times)

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arlee219

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Air Con blows cold air ONLY!!!
« on: 04 January 2010, 22:29:30 »
Hi all!
Here's the thing. Couple a weeks back I had the problem with headgasket, which now is solved (needed to spend a lot of money though).
From this time AirCon blows cold air only, no matter what setting I'm having it on. There's no error code, service or engine light comin on. I took it back to the garage and had the car was checked again to eliminate any air locks (cushions), we checked the pressure and thermostate (all ok) and valve was changed. I've also changed the pollution filter. Still no result. Is it possible, that the system needs re-setting (probably at VX garage) because the battery was off for 2 weeks? And what else could I do, before I run out of patience and scrap the vehicle?
I'd be gratefull for any suggestions!
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Lazydocker

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Re: Air Con blows cold air ONLY!!!
« Reply #1 on: 04 January 2010, 22:33:14 »
What's the outside temperature reading? I know if the sensor goes faulty it can affect the cabin temperature on climate models ::) ::)

Also, are you sure there are no air locks in the coolant system... That's the most likely culprit ;) ;)
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Entwood

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Re: Air Con blows cold air ONLY!!!
« Reply #2 on: 04 January 2010, 22:34:45 »
Pull the small vacuum pipe off the top of the HBV and block it with a bolt or similar .. see if it now runs hot  :)
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arlee219

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Re: Air Con blows cold air ONLY!!!
« Reply #3 on: 04 January 2010, 22:35:36 »
All air locks were eliminated.
The outside temp reading is always correct. (I'm mean it doesn't say +7 if there's -3)

And what's HBV? (I'm really crap with it)
« Last Edit: 04 January 2010, 22:36:15 by arlee219 »
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Entwood

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Re: Air Con blows cold air ONLY!!!
« Reply #4 on: 04 January 2010, 22:38:38 »
Heater Bypass Valve .. looks like a spaceship at the rear of the engine .. uses vac to control the amount of hot water that either goes to the heater or doesn't .. hence its name ..  :)
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arlee219

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Re: Air Con blows cold air ONLY!!!
« Reply #5 on: 04 January 2010, 22:42:19 »
These could be a stupid questions, but (1) is there only one pipe connected to it, and (2) is the HBV just above coolant tank (looks like UFO to me:)) (there's another "regular" tank right next to it - drivers side)
« Last Edit: 04 January 2010, 22:46:36 by arlee219 »
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Entwood

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Re: Air Con blows cold air ONLY!!!
« Reply #6 on: 04 January 2010, 22:48:30 »
3 x 3/4" (ish ?) water pipes ... 2 on one side 1 on the other, 1 very thin 1/4 " ??? vacuum pipe to the top, hidden at the back underneath the scuttle.

2nd picture in this thread (which is about the V6 not yours .. :)  but I THINK its the same ... although I could be completely wrong of course ..  :(  )

http://www.omegaowners.com/forum/YaBB.pl?num=1193594464

« Last Edit: 04 January 2010, 22:51:10 by entwood »
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arlee219

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Re: Air Con blows cold air ONLY!!!
« Reply #7 on: 04 January 2010, 22:51:49 »
I'll check that 2morrow, as it's too dark for it right now I think. Would you mind if I contacted you 2morrow Entwood?
I'm really desperate and driving the car at 6.50 am when there's like -5degrees with no heat is a little bit dangerous and unconfortable (to say the least)...


And thanks for the guide, but as I read: "First, you need to drain the coolant (...)"
Can I (as you suggest) just pull the vac pipe out (while the engine is runnig)?
« Last Edit: 04 January 2010, 22:58:55 by arlee219 »
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Lazydocker

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Re: Air Con blows cold air ONLY!!!
« Reply #8 on: 04 January 2010, 23:02:56 »
Quote
I'll check that 2morrow, as it's too dark for it right now I think. Would you mind if I contacted you 2morrow Entwood?
I'm really desperate and driving the car at 6.50 am when there's like -5degrees with no heat is a little bit dangerous and unconfortable (to say the least)...


And thanks for the guide, but as I read: "First, you need to drain the coolant (...)"
Can I (as you suggest) just pull the vac pipe out (while the engine is runnig)?

Yep... But you need to block the end of it otherwise you'll cause other problems wit unmetered air being sucked in ;) ;)

The vac pipe is the little one on top BTW :y :y
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Entwood

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Re: Air Con blows cold air ONLY!!!
« Reply #9 on: 04 January 2010, 23:05:38 »
Quote
I'll check that 2morrow, as it's too dark for it right now I think. Would you mind if I contacted you 2morrow Entwood?
I'm really desperate and driving the car at 6.50 am when there's like -5degrees with no heat is a little bit dangerous and unconfortable (to say the least)...


And thanks for the guide, but as I read: "First, you need to drain the coolant (...)"
Can I (as you suggest) just pull the vac pipe out (while the engine is runnig)?


What you are reading is how to CHANGE the HBV ...  you are not doing that .. you are disconnecting the vac to see if it makes any difference ... fault finding...  :)  as said before, and repeated by LD .. block the vac pipe with a small bolt to prevent other problems..  :)
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arlee219

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Re: Air Con blows cold air ONLY!!!
« Reply #10 on: 04 January 2010, 23:08:43 »
Block the ends of both HBV and the pipe? Which end sucks and which one blows? (LOL) What should happen if I do it? And is it possible to eliminate any air locks by myself?
Sorry for me being such a pain in the backside, but I'm really crap with all that stuff.
« Last Edit: 04 January 2010, 23:11:03 by arlee219 »
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RobG

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Re: Air Con blows cold air ONLY!!!
« Reply #11 on: 04 January 2010, 23:15:10 »
Block off just the small vac pipe.
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arlee219

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Re: Air Con blows cold air ONLY!!!
« Reply #12 on: 04 January 2010, 23:17:24 »
ok thanks
will post you guys with results as soo as I'm done with it :)
Cheerio
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Lazydocker

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Re: Air Con blows cold air ONLY!!!
« Reply #13 on: 04 January 2010, 23:18:13 »
Quote
Block the ends of both HBV and the pipe? Which end sucks and which one blows? (LOL) What should happen if I do it? And is it possible to eliminate any air locks by myself?
Sorry for me being such a pain in the backside, but I'm really crap with all that stuff.

Just block  the vac pipe... It will confirm whether there's hot water gettin to the HBV and through the matrix ;) ;)
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p j morgan

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Re: Air Con blows cold air ONLY!!!
« Reply #14 on: 05 January 2010, 00:05:43 »
have you tried resetting the aircon put your finger on the and the auto button at the same time for ten seconds and you should here it restting its self  hope this helps ;) :y
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