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#781130 - 28th Mar 2013 1:16pm Engine cooling / car heater.
Willo_ Offline
Forum Master

Registered: 5th Jul 2012
Posts: 2518
Loc: Merseyside
I decided to change my thermostat, (all tho I now wish I took this advice, If it aint broke, don't fix it)

Drained all coolant out put new thermostat in, filled it back up with coolant, and now if my car is stood still with engine running with heater on the temp gauge drops down slowly, if i start driving again it goes back up to half way, and heater is not very good at all.

Yes I know am idiot for not following advice if it aint broke dont fix it.

Hindsight is a wonderful thing.

How can I sort it.

There are 2 pipes that go to heater matrix, 1 inlet and 1 outlet, the inlet seems to be getting hot but outlet not very warm at all, I don't really want to take matrix out, as that is a very big job, and I need my car for work, so don't want to take dash out.
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#781136 - 28th Mar 2013 1:55pm Re: Engine cooling / car heater. [Re: Willo_]
tonyh Offline
Enthusiast

Registered: 5th Feb 2012
Posts: 135
Loc: wirral
start with a good engine and rad flush. empty it all out again then refill the system it sounds like there is air in there somewhere. start topping with water and coolant but before it's full start the engine to get the coolant flowing

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#781137 - 28th Mar 2013 1:58pm Re: Engine cooling / car heater. [Re: Willo_]
baldybrewer Offline

Veteran

Registered: 16th Aug 2009
Posts: 740
Loc: Eastham
Put your old thermostat back in and return the new one as it sounds as if you have bought a faulty unit.

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#781144 - 28th Mar 2013 2:26pm Re: Engine cooling / car heater. [Re: tonyh]
chriskay Offline
Forum Veteran

Registered: 25th Oct 2007
Posts: 4868
Loc: shropshire
Originally Posted By: tonyh
start with a good engine and rad flush. empty it all out again then refill the system it sounds like there is air in there somewhere. start topping with water and coolant but before it's full start the engine to get the coolant flowing


Good advice; certainly worth a try. Does sound like an airlock.
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Carpe diem.

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#781145 - 28th Mar 2013 2:27pm Re: Engine cooling / car heater. [Re: baldybrewer]
insanekitty Offline
Addict

Registered: 18th Mar 2009
Posts: 200
Loc: Woodchurch
Disconnect the heater matrix and connect a hosepipe to the out flow pipe and back flush the matrix
this should remove any crud thats been accumulation over the years.

Reconnect everything and slowly fill it back up. There should be a bleed screw somewhere so loosen this and run the engine till hot with the car blower on fully hot.

wait for it to cool then remove the cap and top up

Keep doing this till the level settles and you have heat inside the car.

Hope this makes sense!

Steve

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#781151 - 28th Mar 2013 3:03pm Re: Engine cooling / car heater. [Re: Willo_]
beanie65 Offline
Member

Registered: 21st Dec 2012
Posts: 70
Loc: wirral
As the above post say's you have an air lock, find your bleed screw(usually on top of the rad) loosen it off and run the engine and keep topping up the water till it settles.
that should fix it.
Beanie.

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#781171 - 28th Mar 2013 3:53pm Re: Engine cooling / car heater. [Re: Willo_]
Willo_ Offline
Forum Master

Registered: 5th Jul 2012
Posts: 2518
Loc: Merseyside
Mine does not have bleed screaw.

I think it was an airlock, as coolant has now dropped, and I have topped it back up, heater is now lovely and toasty hot.
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#781253 - 28th Mar 2013 7:08pm Re: Engine cooling / car heater. [Re: Willo_]
peodude Offline
Addict

Registered: 7th Nov 2007
Posts: 205
Loc: Birkenhead
What was your reasons for changing a working thermostat? Seems a strange precautionary measure.

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