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Front heater.....

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peteinchad
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PostPosted: Fri May 11, 2018 10:58    Post subject: Reply with quote

Kevstar81 wrote:
How do I check that?


Second post on HERE


Kevstar81 wrote:
Would that make it work then blow cold after 40 mins on the motorway ?


If the front matrix is clear and the rear heater gets hot then it can't be much else.
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Adamjackson87
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PostPosted: Tue Oct 16, 2018 20:56    Post subject: Reply with quote

Did you ever get to the bottom of your problem ? I would of said your front heater matrix is partially blocked, so your getting hot water flowing through it but not all of it, it's common for a heater matrix to plug up some of its internal cores causing the hot water to bypass all of its cores , common symptoms of this is cold or Luke warm air from vents can get warmer when sat revving the engine, and then cool off after a while or back down to idle.
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Kevstar81
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PostPosted: Mon Oct 29, 2018 18:37    Post subject: Reply with quote

I have flushed system out and loads of bits came out from matrix. I got slightly better heat but it still goes cold/Luke warm after 45 mins ish.
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Kevstar81
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PostPosted: Mon Oct 29, 2018 18:49    Post subject: Reply with quote

I have noticed that the bottom of the radiator stays cold and so is the pipe at the bottom of the rad. Even after a hour drive.
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peteinchad
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PostPosted: Mon Oct 29, 2018 19:47    Post subject: Reply with quote

Kevstar81 wrote:
I have noticed that the bottom of the radiator stays cold and so is the pipe at the bottom of the rad. Even after a hour drive.


You have either got an extremely good radiator or your thermostat isn't opening - which I would have thought would cause your engine to overheat, but it obviously isn't overheating.
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Kevstar81
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PostPosted: Mon Oct 29, 2018 19:53    Post subject: Reply with quote

Brand new rad and brand new thermostat.
Tested thermostat in hot water and it opened.
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peteinchad
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PostPosted: Mon Oct 29, 2018 19:58    Post subject: Reply with quote

Very strange.

I have a twin core 40mm all aluminium radiator and my bottom hose gets hot(ish).

I wonder if your water pump isn't pushing coolant round the engine properly - which might explain your cool heater.
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Kevstar81
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PostPosted: Mon Oct 29, 2018 21:03    Post subject: Reply with quote

That's the only thing I ain't replaced.
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peteinchad
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PostPosted: Tue Oct 30, 2018 5:34    Post subject: Reply with quote

Kevstar81 wrote:
That's the only thing I ain't replaced.


It's a cheap and easy job - might be worth doing it.
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Simonfathead
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PostPosted: Tue Oct 30, 2018 7:49    Post subject: Reply with quote

That wouldnt explain the rear heater working and not the front though
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Simonfathead
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PostPosted: Tue Oct 30, 2018 7:51    Post subject: Reply with quote

I had something similar in my v6 where the rear worked but not the front, but that was an air lock in the system took me ages to clear it.
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Kevstar81
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PostPosted: Tue Oct 30, 2018 8:22    Post subject: Reply with quote

The system has been drained loads so surly the air lock would of gone by now?
I did notice last night that the back heater is not as boiling jot as I would like.
I think I'm going to replace the water pump and I might get another thermostat just to safe.
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Simonfathead
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PostPosted: Tue Oct 30, 2018 8:51    Post subject: Reply with quote

thats how i got my airlock from draining the system and flushing out the matrix. Just a thought though might be worth a try before you try anything else and it doesnt cost anything to do it.
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Kevstar81
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PostPosted: Sun Nov 04, 2018 12:08    Post subject: Reply with quote

After cleaning water system with dish washer tablets I tried to drain from bottom drain plug and it was blocked. I unblocked it and loads of bits come out of it. I washed more water through. I then replaced the water pump.
So after a new rad, rad cap, thermostat, water pump. God knows how much aint freeze.
I now have really good heat.
I'm going to put 2 more dishwasher tablets in to make sure it's clean. But I know have very good heat for the winter.
Thank you for all your help.
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