One thing I've noticed about the heater valve is that the range of motion
of the valve lever (from full open to full closed) is slightly larger
than the range of motion of the cable when actuated by the control knob.
What this means is that you have to carefully judge how you adjust the
cable, including the free play. You kind of have to decide if you want
maximum flow, or if you want the valve to close completely. If you go for
positive shutoff, it tends to stop opening at about the 3/4 to 7/8th open
position. If you adjust the cable so it will open all the way, it tends
to stop before the valve is quite closed. I think this is what accounts
for the wildly varying experiences -- "hot all the time" vs "never hot
enough".
In this climate, I chose "positive shutoff", but I suppose it would be
worth it to try a slight readjustment each spring and fall.
Tim Economu had this to say:
>CR:
>
> Thanks for the heads up but no, it mostly comes thru the heater core on my
>car. With the water flow shut off, the cabin runs very cool, or at least
> very close to ambient temp. Of course I tested the theory before I
>installed
> the valve, which is easy to do. You might try the test...it might be partly
> your problem also...
>
> P.S. Unbushed holes? How can that be on a 30 year old car?? <smile>
>
>Kind regards..
> Tim
>
>> ----- Original Message -----
>> From: "Charley & Peggy Robinson" <ccrobins@ktc.com>
>> To: "Tim Economu" <economu@whidbey.com>
>> Cc: <rrobertsmg@hotmail.com>; "MG List" <mgs@autox.team.net>
>> Sent: Friday, November 17, 2000 4:59 PM
>> Subject: Re: Replacement Heater Valve
>>
>>
>> >
>> > I put in a new stock valve last year, heater works fine, plenty of
>> > heat. I thought the valve didn't shut off, in the summer. Turned out
>> > that there was lots of heat coming into the interior thru the firewall.
>> > All those little unbushed holes for wiring and cables, y'see. Might
>> > take a look at your car, in that respect.
>> >
>> > FWIW and Cheers,
>> >
>> > CR
>> >
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
|