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#758288 - 16th Jan 2013 8:05pm Car blowing cold air when at lights
chris123 Offline
Smartchild

Registered: 1st Mar 2010
Posts: 599
Loc: wallasey
Noticed when driving home tonight the fan in my car starts blowing cold air when stopped at lights etc with the heat on full.

When driving along normally the heater is kicking in as it should ie warm but then goes cold again when stopped at lights- only noticed this tonight, seemed fine this morning on the way to work. Its a 2006 astra if that helps- any ideas??

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#758296 - 16th Jan 2013 8:30pm Re: Car blowing cold air when at lights [Re: chris123]
vwshmee Offline
Newbeee

Registered: 24th Feb 2012
Posts: 23
Loc: Bebington
We had a 98 Astra and that was the first sign of the cylinder head gasket going

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#758315 - 16th Jan 2013 8:47pm Re: Car blowing cold air when at lights [Re: chris123]
s7uajones Offline
Enthusiast

Registered: 14th Jan 2013
Posts: 196
Loc: Wirral
Hi they suffer from thermostat problems, it comes complete with housing about 120 fitted . Or it could be the water pump if your realy unlucky as that's driven off the cambelt and labour intensive.
The best way to tell is take the small hose off the expansion tank and see if water pumps out
I could take a look if you want

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#758330 - 16th Jan 2013 8:59pm Re: Car blowing cold air when at lights [Re: chris123]
j_demo Offline
Forum Addict

Registered: 4th Nov 2011
Posts: 1827
Loc: Wallasey/New Brighton
alternator?????????????????????????????????????

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#758332 - 16th Jan 2013 9:00pm Re: Car blowing cold air when at lights [Re: chris123]
Capt_America Offline
Forum Addict

Registered: 26th Jul 2008
Posts: 1498
Loc: Wallasey
Originally Posted By: chris123
Noticed when driving home tonight the fan in my car starts blowing cold air when stopped at lights etc with the heat on full.

When driving along normally the heater is kicking in as it should ie warm but then goes cold again when stopped at lights- only noticed this tonight, seemed fine this morning on the way to work. Its a 2006 astra if that helps- any ideas??


Check your water level. If you have a heater box it could be getting engine water when you are driving but not stationary.
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#758335 - 16th Jan 2013 9:08pm Re: Car blowing cold air when at lights [Re: chris123]
Pete_Robbo Offline

Keep It Real !!
Wiki Guide

Registered: 11th Aug 2008
Posts: 6640
Loc: Wirral
water pump or matrix fail heater controls ?
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#758354 - 16th Jan 2013 9:34pm Re: Car blowing cold air when at lights [Re: chris123]
chris123 Offline
Smartchild

Registered: 1st Mar 2010
Posts: 599
Loc: wallasey
Cheers for the suggestions- had a little look before and the coolant does look a little low well its under the cold marker anyway but I had just driven home. Will have a proper look in the morning as cant see to much in the dark and my torch isnt the best.

I had a split pipe going to the heater matrix which was emptying coolant in minutes about 6 months ago but the symptoms were different so hoping not the same, doesnt seem to be leaking thou...

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#758355 - 16th Jan 2013 9:36pm Re: Car blowing cold air when at lights [Re: s7uajones]
chris123 Offline
Smartchild

Registered: 1st Mar 2010
Posts: 599
Loc: wallasey
Dont think it has a belt think its a chain if that helps?
Originally Posted By: s7uajones
Hi they suffer from thermostat problems, it comes complete with housing about 120 fitted . Or it could be the water pump if your realy unlucky as that's driven off the cambelt and labour intensive.
The best way to tell is take the small hose off the expansion tank and see if water pumps out
I could take a look if you want

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#758365 - 16th Jan 2013 10:02pm Re: Car blowing cold air when at lights [Re: chris123]
baldybrewer Offline

Veteran

Registered: 16th Aug 2009
Posts: 740
Loc: Eastham
It is the thermostat mate had exactly the same problem with my Zafira eurocarparts were the cheapest and 20 mins to fit.

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#758378 - 16th Jan 2013 10:37pm Re: Car blowing cold air when at lights [Re: s7uajones]
mrhanky Online   scary_mood
Forum Addict

Registered: 1st Dec 2010
Posts: 1236
Loc: my house
Originally Posted By: s7uajones
Hi they suffer from thermostat problems, it comes complete with housing about 120 fitted . Or it could be the water pump if your realy unlucky as that's driven off the cambelt and labour intensive.
The best way to tell is take the small hose off the expansion tank and see if water pumps out
I could take a look if you want


chain driven, the pump runs off the drive belt and the stat is about 25.00 and a two minute job to change.

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#758380 - 16th Jan 2013 10:45pm Re: Car blowing cold air when at lights [Re: mrhanky]
mrhanky Online   scary_mood
Forum Addict

Registered: 1st Dec 2010
Posts: 1236
Loc: my house
forgot to say...

top it up first, bleed it and then see how it goes, they can be a bit of a fussy system sometimes wink

also check the drain on the radiator is tight, bottom on the drivers side.

take it yours hasn't got the water temp gauge? if so watch out for them as the coolant level sender can be a pain in the backside, had one the other week that worked in a different time zone wink

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#758416 - 17th Jan 2013 8:47am Re: Car blowing cold air when at lights [Re: chris123]
chris123 Offline
Smartchild

Registered: 1st Mar 2010
Posts: 599
Loc: wallasey
Ok- bit more information........................

Topped up the coolant this morning as was quite low but still some in the tank, it needed quite a lot to fill up to cool marker about 1.5 litres. Just driven about 5 miles and come back checked coolant and its back to roughly where it was originally.

Not sure if this is normal or not but seems to have used a lot of coolant for a very short journey will leave the car outside and go and check in an hour or so.

It is no longer blowing out cold air though! Have checked and no sign of leaks, damaged pipes etc should I be worried?

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#758421 - 17th Jan 2013 8:53am Re: Car blowing cold air when at lights [Re: mrhanky]
chris123 Offline
Smartchild

Registered: 1st Mar 2010
Posts: 599
Loc: wallasey
No theres no temp on the dash in this car....

Definately on tight and not cross theaded etc.

Originally Posted By: mrhanky
forgot to say...

top it up first, bleed it and then see how it goes, they can be a bit of a fussy system sometimes wink

also check the drain on the radiator is tight, bottom on the drivers side.

take it yours hasn't got the water temp gauge? if so watch out for them as the coolant level sender can be a pain in the backside, had one the other week that worked in a different time zone wink



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#758637 - 17th Jan 2013 7:39pm Re: Car blowing cold air when at lights [Re: mrhanky]
s7uajones Offline
Enthusiast

Registered: 14th Jan 2013
Posts: 196
Loc: Wirral
Have you priced a stat up or just gone off hear say the last one I did was 70 to buy
Send me your reg and I will get a more accurate price

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#758648 - 17th Jan 2013 8:03pm Re: Car blowing cold air when at lights [Re: chris123]
baldybrewer Offline

Veteran

Registered: 16th Aug 2009
Posts: 740
Loc: Eastham
Originally Posted By: chris123
Ok- bit more information........................

Topped up the coolant this morning as was quite low but still some in the tank, it needed quite a lot to fill up to cool marker about 1.5 litres. Just driven about 5 miles and come back checked coolant and its back to roughly where it was originally.

Not sure if this is normal or not but seems to have used a lot of coolant for a very short journey will leave the car outside and go and check in an hour or so.

It is no longer blowing out cold air though! Have checked and no sign of leaks, damaged pipes etc should I be worried?


The thermostat is most probably stuck open a common fault on vauxhall cars which is why there is no water in the header tank.

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