Coupe heater hoses.

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Coupe heater hoses.

Post by AJL Electronics » Mon Oct 29, 2018 12:50 pm

Which way around do they go? Long one on the top or bottom port of the heater please?


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Post by David Tew » Mon Oct 29, 2018 1:00 pm

Long hose from back of pump to the top, hose from manifold to the bottom. :wink:


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Coupe heater hoses.

Post by scimjim » Mon Oct 29, 2018 1:45 pm

Why that way David?

I think having the “hot” hose at the top will give the heater matrix a slightly quicker warm up - but in reality I don’t think it really matters.


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Coupe heater hoses.

Post by philhoward » Mon Oct 29, 2018 1:48 pm

Doesn't "convention" suggest the hot inlet comes in the bottom and the "cold" outlet out the top?


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Coupe heater hoses.

Post by scimjim » Mon Oct 29, 2018 2:04 pm

cold water will drop down, which helps circulation and pumping hot water into the top will heat up the matrix quicker from cold.

A radiator's (hot) inlet is normally at the top?


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Coupe heater hoses.

Post by philhoward » Mon Oct 29, 2018 3:02 pm

I've got something in the back of my head that suggests that automotive systems don't follow the convention for a heat exchanger but can't find anything quickly to suggest this. Almost everything automotive shows hot at the top, cold at the bottom although I did find reverse flow through the engine being used but only on "high performance" engines (hot water out from the block, cold water into the head).


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Coupe heater hoses.

Post by AJL Electronics » Mon Oct 29, 2018 3:24 pm

The reason for asking is that the hose to the pump will be grazing the top of the engine if it feeds the bottom as expected.


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Post by scimjim » Mon Oct 29, 2018 3:32 pm

parts list shows it as David said - with clips for the top hose
coupe heater.jpg
coupe heater.jpg (133.01 KiB) Viewed 283 times


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1300 SS1 (Number One) & Sarah's coupe.
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Coupe heater hoses.

Post by roymck » Mon Oct 29, 2018 3:47 pm

Can straight hoses be used is there room , hose 19 has a particularly tight bend on it . I guess original hoses are NLA



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Coupe heater hoses.

Post by David Tew » Mon Oct 29, 2018 4:06 pm

roymck wrote:
Mon Oct 29, 2018 3:47 pm
Can straight hoses be used is there room , hose 19 has a particularly tight bend on it .
I used straight silicon hoses with couplers and 90-degree bends at the matrix. Where pipe 20 wraps around the bulkhead I bent a piece of 15mm copper pipe fixed in place by the original clips so the run from the pump is also straight.


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