Cutting off heat !?

transexl

transexl

Member
Hi all !

I´ve driven to work with Jimmy.
A real treat as the weather is gorgeous and I am too tired to cycle today.
And what a great experience it is EVERY SINGLE time.
Some nice, not too busy back roads, the wind through the ragtop, the magnificent hood pointing the direction, the engine burbling ... :D .
(I wonder whether we should have spent the 120 Euros for the new radio we ordered for fuel instead :wink: !)

I keep asking myself if I might seem a right plonker, asking far too many questions about too many issues - and getting nothing done - well, at least it might look that way :oops: :cry: .
(I DID put in a LED-coutesy lamp, got the horn fixed AND a new weathershield visor installed, though ! And I greased the wiper studs, some hinges, the choke cable and a window mechanism. So I achieved something ...)

To my question:

Is it practical to put a tap into the hose that leads the coolant to the heater to prevent engine heat to get into the car ?

Today (and on every drive for that matter !) I could feel the heat of the engine crawling in after a few miles, and as Jimmy will be driven in summer only - or you can turn the tap "on" when it is cold - this would be a measure for the time until the heater section and flaps are rebuilt.
Maybe (!) it is even possible to drain the heater to stop it from rusting until it is repaired, but that might be just - well, you´ll tell me :D


Bye for now

stefan
 
Do you not have the heat valve (red & blue slider) working? That should cut the supply of hot water off to the matrix.

Or you could just bypass the matrix completely if you really don't want it?
 
transexl said:
Is it practical to put a tap into the hose that leads the coolant to the heater to prevent engine heat to get into the car ?
Click to expand...

I wouldn't say so, no.
Others will have more experience on the matter than me, but as I see it there are two means by which hot water from the engine can get back to the thermostat housing, and thence the radiator. I'm not intimately familiar with the V8 engine bay so couldn't point to the exact hoses, but there's not reason why it would deviate from standard practice. Hot water from the manifold goes via the matrix and then through a pipe back to the thermo stat housing. From there, the stat will decide whether to send it via the rad or not. If you block this off, you are effectively blocking up one of the means by which hot coolant can leave the engine, contributing to either general engine overheating, or fuel vaporisation from a hotter-than-idea manifold. Either way, not a wise move.

The only way to do it would be to connect the matrix 'in' and 'out' pipes together (ie, bypass the matrix) as a15htn says, or go for a longer term solution and fit a cable operated bypass tap (like Triumphs had), which is like a bigger version of the petrol reserve tap, routing coolant either through to the matrix, or to the 'out' hose.

Of course, the real solution (as I suspect others will mention) is to replace the foam seals in the heater box, and get all the flaps in proper working order. If that is set up properly, the matrix can be shut away in its housing by pulling the heater control lever fully upwards. Any heat will stay where it is and not mix with the general cool air entering the ventilation system.

What's that? Easier said than done, I hear you cry??! :(
 
a15htn said:
Do you not have the heat valve (red & blue slider) working?
Click to expand...

I could hardly answer that one correctly should my life depent on it, to be honest :!:
It was obvious that the heater was not working properly right from the start - that´s the heater fan. It was working for some minutes last year, but nothing since, as I wrote here and discussed with Chris, Nick and others...
I´ve been fiddling with the levers EVERY single time the car is rolling, but as NO setting seems to be effective or coherent, I cannot tell what lever/flap is working to what ammount or effect ... !
I do feel the heat from the engine bay, though, and until now thought that it was coming "through the wall".

redrover said:
What's that? Easier said than done, I hear you cry??! :(
Click to expand...

... and that is the point exactly:

I was hoping for some opportunity to fix the wipers AND the flaps/heater unit in one go this year.
I´ve been told by several people that the latter is "a bit of work".

As I do not have the facilities to leave my bikes, leave alone a car, standing dismatled, in the dry and theft-safe, I might at some point find somewhere to hire or the like... .
Until then I need to improvise.

This hint, by the way, is suggested by a buyers guide for the P6B in a magazine recently.
The man giving his opinion has had a Rover dealership since the 60s, has driven several V8s since then and does service and supply parts until today... .
I was told that a tap in the system might be a - well, what do you call it in English - rough and un-elegant improvisation for those not capable of the real work (fixing the flaps, that is), but technically (thermically !) the trick seems to be sound, although I can understand all objections and worries :!:

Well.
Let´s see where this goes.

THANKS for now !

stefan
 
Helo Stefan!

Why not simply remove both heater hoses completely from the heater and from the engine. Then take some plain hose and make a loop from one engine outlet to the other one. Then no heat can be escaping from the heater! But you will still have outside air coming through it.

Chris
 
chrisyork said:
Why not simply remove both heater hoses completely from the heater and from the engine. Then take some plain hose and make a loop from one engine outlet to the other one. Then no heat can be escaping from the heater! But you will still have outside air coming through it.
Click to expand...


Guten Morgen Chris

I was thinking along the same lines.
No "turning on the heat when it´s colder", of course, so I´ll have to check with Heike - she´s the one that´s cold more often than me... .

But VIELEN DANK, I was hoping to see a coment from you here !

Bis dann

stefan
 
What inner diameter ?

Hi all !


I will try and do one of the hose-jobs stated above.

It would make it easier for me if I knew what inner width the upper hose to the heater has.
I then could put in a tap or take out the hose, replace it and short-cut the heater.
(I´ll freely admit that this is obviously related to me being too lazy to take off the hose, measure it, step into another car and buy the tap or hose to put in ... . :oops: )

Does anybody know ?


DANKE !

stefan
 
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