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#555326 - 22/01/19 01:30 PM Smiths Round heater
TBM Offline
Learner Plates Off!

Registered: 06/11/18
Posts: 430
Loc: Northants, UK
And on to my next issue smile

I have the round Smiths Heater in the passenger footwell and although she gets a little warm, she doesn't get hot. The previous owner had a tap installed, so it must have got 'too warm' at some point in the past.

At the weekend I replaced the hoses, removed the tap and flushed the heater matrix in both directions. However she still doesn't seem to get warm.

I have one hose that goes from a 'take off' on the the water pump and into the heater matrix and a second hose that goes from the matrix to the inlet manifold.

When the engine runs, the hose from the heater matrix to manifold gets warm, whereas the hose from the water pump to heater remains cold. Personally I would have thought the opposite - the water should flow from the water pump, to the heater matrix and then back in through the manifold so the hoses should either be the same temperature, or the pump to matrix hose should be slightly warmer.

Any thoughts?

Both hoses are new. The matrix is clear and water is definitely flowing out of the water pump at pressure when running and the car maintains temperature well.
_________________________
1972 4/4 4 seater
Too many ratty motorbikes

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#555327 - 22/01/19 02:27 PM Re: Smiths Round heater [Re: TBM]
tmg513 Offline
Talk Morgan Enthusiast

Registered: 27/08/08
Posts: 1950
Loc: Powick
Manifold to heater then return to the water pump is the correct direction. It sounds like you have an air-lock. I'd loosen the clip on the heater return hose and gently pull it away when the engine's just started to see if any air comes out.
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1972 4/4 2 Seater

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#555329 - 22/01/19 02:38 PM Re: Smiths Round heater [Re: tmg513]
TBM Offline
Learner Plates Off!

Registered: 06/11/18
Posts: 430
Loc: Northants, UK
Originally Posted By tmg513
Manifold to heater then return to the water pump is the correct direction. It sounds like you have an air-lock.


Ah, opposite to the way I thought and will explain why that hose gets hot first. Thank you.


Originally Posted By tmg513
I'd loosen the clip on the heater return hose and gently pull it away when the engine's just started to see if any air comes out.


I did this - got showered in fluid- there was definitely water coming out of the matrix. I'll have a crack again at the weekend and see if I can get any air out. Is there a preferred 'in and out' for the matrix? Currently the hose from manifold enters the matrix on the passenger left/passenger side and exits back to water pump on the right/drivers side.

If I was going to fit a tap, am I right to assume it should be in the hose going from manifold to matrix, rather than in the hose from matrix to pump (as fitted by Allon White).
_________________________
1972 4/4 4 seater
Too many ratty motorbikes

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#555331 - 22/01/19 02:41 PM Re: Smiths Round heater [Re: TBM]
Burgundymog Offline

Talk Morgan Addict

Registered: 11/05/14
Posts: 3460
Loc: Essex
Try removing both hoses and filling the heater manually
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2013 narrow bodied + 4 Ruby. Wolf performance Re-map suspension mods and K&N cone filter.

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#555352 - 22/01/19 04:33 PM Re: Smiths Round heater [Re: TBM]
CooperMan Online   content

Talk Morgan Regular

Registered: 19/11/15
Posts: 834
Loc: Yorkshire
If you feed the hot supply in to the top of a matrix & the return cooler water out of the lower level, you will aid circulation by the thermo-syphonic effect
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Jon M

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#555354 - 22/01/19 04:42 PM Re: Smiths Round heater [Re: TBM]
B3MOG Offline

L - Learner Plates On

Registered: 05/02/13
Posts: 100
Loc: north yorkshire
make sure a thermostat is fitted.

David Byrne

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#555366 - 22/01/19 06:18 PM Re: Smiths Round heater [Re: CooperMan]
TBM Offline
Learner Plates Off!

Registered: 06/11/18
Posts: 430
Loc: Northants, UK
Originally Posted By CooperMan
If you feed the hot supply in to the top of a matrix & the return cooler water out of the lower level, you will aid circulation by the thermo-syphonic effect


Unfortunately Inlet and Outlet are exactly the same level.
_________________________
1972 4/4 4 seater
Too many ratty motorbikes

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#555387 - 22/01/19 07:59 PM Re: Smiths Round heater [Re: TBM]
tmg513 Offline
Talk Morgan Enthusiast

Registered: 27/08/08
Posts: 1950
Loc: Powick
You could try eliminating the matrix by joining the two hoses together and seeing whether the whole length of the joined hose heats up. That should give you a better idea exactly where the problem is.
_________________________
1972 4/4 2 Seater

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#555389 - 22/01/19 08:02 PM Re: Smiths Round heater [Re: tmg513]
TBM Offline
Learner Plates Off!

Registered: 06/11/18
Posts: 430
Loc: Northants, UK
Originally Posted By tmg513
You could try eliminating the matrix by joining the two hoses together and seeing whether the whole length of the joined hose heats up. That should give you a better idea exactly where the problem is.


Good plan
_________________________
1972 4/4 4 seater
Too many ratty motorbikes

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#555466 - 23/01/19 09:27 AM Re: Smiths Round heater [Re: TBM]
CooperMan Online   content

Talk Morgan Regular

Registered: 19/11/15
Posts: 834
Loc: Yorkshire
Originally Posted By TBM
Originally Posted By CooperMan
If you feed the hot supply in to the top of a matrix & the return cooler water out of the lower level, you will aid circulation by the thermo-syphonic effect


Unfortunately Inlet and Outlet are exactly the same level.


Oh dear, not well designed, this makes you totally reliant on the efficiency of the water pump and the frictional losses of the hoses and matrix core, you may have a partial air lock in the heater - try a bit of a power flush with a hosepipe via the feed pipework
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Jon M

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