Heater only blows out cold air.

[dom]

me and Dom have both done the same lol

 

[barrym381]

me and Dom have both done the same lol

 

thought you 2 would have known better 

[D1andonlyantman]

Earned myself some man points today and changed the thermostat and coolant temperature sensor in the morrisons car park behind my house where I park. It took me just under 4 hours but that's coz it got dark halfway through but I weren't gonna stop once id started.... My back hurts.... Anyway, My car now gets up to 90 and stays there now (woo!) but the bloody heater still only blows out lukewarm air!? A friend said it could possibly be the water pump but that was replaced last year as far as I know so is it more than likely the heater matrix? I should probably mention that when I filled up the expansion tank once I was done it only took 1.5L and didn't want any more even after I'd had it running for about 10 minutes. It was only when I started to drive it suddenly started saying STOP and then I had a look and the expansion was empty again. Sorry for the essay... Can't believe it still doesn't bloody work!

Thanks.

[dom]

Having to top the coolant up again is normal.

4 hours is crazy! I did it in under an hour including draining the coolant and refilling at the end.

[D1andonlyantman]

There was a bit of back and forthing to the house and I also had to go buy a new bolt for the thermostat housing when I dropped one and couldn't find it. Of course I found it again later once I had already been to the shop lol putting it back together was a lot quicker than taking it apart. Another thing I noticed while out driving is if I have it blowing gently it feels warner than if it's on high it that means anything? Is there an easy way to test the waterpump? Leave the car idling and if it doesn't overheat then it must be working or something like that?

[barrym381]

There was a bit of back and forthing to the house and I also had to go buy a new bolt for the thermostat housing when I dropped one and couldn't find it. Of course I found it again later once I had already been to the shop lol putting it back together was a lot quicker than taking it apart. Another thing I noticed while out driving is if I have it blowing gently it feels warner than if it's on high it that means anything? Is there an easy way to test the waterpump? Leave the car idling and if it doesn't overheat then it must be working or something like that?

if your car does not overheat while driving chances are your pump is working 

[D1andonlyantman]

Well there is a sticker in the engine bay tht says the can belt was done last yet but doesnt mention the pump. It was a friend that put the idea in my head but it did make me wonder why the expansion tank took so long to empty if the pump was working. I thought it would have sucked it into the system straight away or does the pump only kick in once the engine gets good and hot?

[barrym381]

Well there is a sticker in the engine bay tht says the can belt was done last yet but doesnt mention the pump. It was a friend that put the idea in my head but it did make me wonder why the expansion tank took so long to empty if the pump was working. I thought it would have sucked it into the system straight away or does the pump only kick in once the engine gets good and hot?

the tank went empty when the thermostat opened thats how you had to refill dont worry it usually happens 

[D1andonlyantman]

Ah, should have known that. Just trying to get my head around how it works so I can make my own educated guess at what I think the problem is, but seeing as I just had the thermostat out I should have known that are there no more tell tale signs to look out for to tell me if it's a dodgy pump or the matrix? Is it hard to replace the matrix? Despite it taking me ages to do the stat, I'm am quite hands on and don't mind getting stuck in as long as it's not one of them things where you undo a few bolts and suddenly springs and cogs are shooting everywhere

[barrym381]

as said cant see it being your waterpump if your car does not overheat