Heater hose

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Heater hose

Postby alanty » Wed Nov 30, 2016 9:29 am

1965 minor 100 traveller
Can anyone tell me the correct way the heater pipes are connected .In the workshop manual the pipe from the cyl head goes to the top connection of the heater radiator, yet mine goes to the bottom connection
The problem I have is that the inlet pipe to the heater is very hot whilst the return pipe from the heater is very much cooler without the heater blower operating .I have backflushed the heater which has a good flow and the thermostat is working correctly has anyone any ideas on this
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Re: Heater hose

Postby woodywoodchipper » Wed Nov 30, 2016 2:19 pm

cylinder head to bottom(as yours)

top pipe to return to connection on bottom hose,

check your valve is opening fully, they tend to get sludge trapped in them,

also you can remove the return pipe whilst engine is running to clear out any air blockage(watch your fingers at the fan) this will also give and indication if the pump is working properly (ie slow flow blockage/worn pump)

Alan,
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Re: Heater hose

Postby alanty » Wed Nov 30, 2016 3:37 pm

Thank you
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Re: Heater hose

Postby old english white » Wed Nov 30, 2016 5:10 pm

I've just checked on both of my Minors and they are as Alan describes with the hose from the heater tap (or valve) on the cylinder head being the lower one on the heater matrix. I also agree with him that the heater valve can pretty much block up. The heater on my car was hardly giving out any heat a couple of years ago. I changed the thermostat, the hoses and flushed out the matrix before even thinking about the valve which appeared outwardly to be fine........
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Re: Heater hose

Postby Plin » Thu Dec 01, 2016 4:14 pm

Sorry I can't help with your query - but :D welcome to the forum alanty.
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Re: Heater hose

Postby Sleeper » Thu Dec 01, 2016 5:29 pm

Dear All
I know I'm a new boy here, and should speak only when spoke to....but....,water circulation , this doesn't sound right to me,forgetting the pump for the moment,the engine heats the water and it rises it then passes to the heater matrix where it cools and falls so shouldn't the hot pipe from the cylinder head go to the top pipe of the heater ?

John :?
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Re: Heater hose

Postby Panky » Thu Dec 01, 2016 5:52 pm

Hi and welcome from me too :)
If the inlet was at the top of the heater then I think you would have trouble bleeding the matrix - you may speak now ;)

You can see from this pic where it goes, I didn't have a heater valve connected at the time it was taken
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Re: Heater hose

Postby woodywoodchipper » Thu Dec 01, 2016 6:30 pm

as water heats it rise's so connect to the bottom will fill the matrix and expel any air in the system, removing the return pipe also helps when engine running,

remember no question is a dumb question so shout up if not sure,

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Re: Heater hose

Postby alanty » Thu Dec 01, 2016 9:11 pm

The reason for the post was a poor heater I had tried back flushing the heater radiator ,checking the control valve and bleeding the system by removing the return pipe with the engine running without success.
My car was piped so that the inlet flow to the heater was at the bottom connection but in the workshop manual it shows that the inlet pipe should be connected to the top ,after ringing round people who deal with minors and receiving differing opinions I decided to post on the forum to get the members views ,in the mean time I opted to follow the workshop manual and piped the heater as per the drawing and it now works perfectly
I am now baffled but with a hot heater
Many thanks to all who have posted a reply to my question
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Re: Heater hose

Postby Panky » Thu Dec 01, 2016 10:45 pm

How strange, someone somewhere must have hoses crossed over on the other side of the bulkhead I guess :?
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Re: Heater hose

Postby woodywoodchipper » Fri Dec 02, 2016 2:17 pm

at least your warm now, ;)

agree with panky though, :D
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Re: Heater hose

Postby emjay » Mon Dec 05, 2016 4:35 pm

It really doesn't matter. The older round heaters will have air at the top of each coil and in all cases there will be some local high spot in the hoses. The best thing to do is take both hoses off under the hood and hold them high. Then pour coolant in one until it comes out of the other, put you thumb over the ends, connect one end while still holding the other, and then quickly do the other. The heater is now bled.

For best heat exchanging the hose from the heat should go to the side of core where the heated air exits to create a counter-flow heat exchanger, but you will never notice the difference.
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