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31
Annual Portland All British Car Field Meet, Portland, OR. www.abfm-pdx.com .
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General Discussion / Re: heat coming from bottom of drivers seat firewall
« Last post by Art on June 03, 2021, 08:26:01 AM »
Hi Brian,

Very good.  Glad I could help!

Hope to see you on the road sometime.

Safety Fast!

Art
33
General Discussion / Re: heat coming from bottom of drivers seat firewall
« Last post by june2021 on June 02, 2021, 03:23:51 PM »
Art, you nailed, of course. It was a heater valve that would not seal. Replaced and all done! Thanks too for always indicating the Moss Auto part numbers too.
Brian
34
General Discussion / Re: heat coming from bottom of drivers seat firewall
« Last post by june2021 on May 28, 2021, 08:44:51 AM »
thanks Art! I will check this out and let you know.
Brian
35
General Discussion / Re: heat coming from bottom of drivers seat firewall
« Last post by Art on May 28, 2021, 08:39:01 AM »
First thing to check is if the heater valve (ref. Moss P/N 360-410) is closed and sealing. 

Sometimes the control cable slips and doesn't close it all the way or the internal gasket or seat inside the valve body deteriorate and no longer seal properly, so you get a constant hot coolant flow to the heater as if the valve were open. 

Those 'flap vents' on the heater never really seal completely, so there's always some air flow through them from the vent as you are moving, even with the fan off.  Heat would likely come through the small duct vent on the drive tunnel just alongside the gas pedal.  Goes right on your feet, so can really warm things up.  When stop driving, the airflow stops.  The fix is to replace the valve.  Cheap and easy to do, so might be warranted, even if you can't determine if that's the problem.

Also I'd check the firewall plug just above the pedal.  It's a fairly large rubber cap (ref Moss P/N 282-970) just above the brake and clutch pedals in front of the brake and clutch master cylinders.  Same deal - air flows only when you move and it's all from the engine compartment, so hot.  It just pops into place and can partially open or fall out entirely.  Easy fix to reinstall or replace if missing.

Those are the simple ones.  Let me know how you make out.  Hope that helps.

Safety Fast!

Art

 
36
General Discussion / heat coming from bottom of drivers seat firewall
« Last post by june2021 on May 27, 2021, 01:07:07 PM »
I have a 1974 MGB. Heat comes blasting from somewhere on the drivers side near the feet. All vents are closed but yet the hot air still comes through. Any suggestions on why and how to stop?
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Cars for sale / 1967 B-GT disassembled
« Last post by amgba on May 26, 2021, 10:47:22 PM »
1967 MGB-GT: disassembled for restoration.  Some resto work completed – new driver’s side floor pan with rocker and sill assembly replaced, new battery boxes.  Also includes all parts from another ‘67 GT except body.  $2,000.00.  828-499-3272 or email: fdesignsllc@bellsouth.net.  NC
38
Cars for sale / Later 1974 MGB
« Last post by amgba on May 22, 2021, 09:09:50 PM »
Later 1974 MGB. Well maintained; good paint, no rust. 4 speed trans with OD. Top and tires excellent. No smoke; strong oil pressure. SS exhaust. Drive anywhere. 64000 miles on clock. $10,000. Email Dave:dswahill517@gmail.com or text 518 578-1201.
39
Cars for sale / 1974 MGB Sebring Tribute
« Last post by amgba on May 14, 2021, 04:18:07 PM »
1974 MGB Sebring Tribute. Supercharged built 1.8 motor and 5-speed gearbox.  Both factory hardtop and newer soft top. Over $30K in parts alone.  Too much to list here.  Build narrative available to seriously interested parties.  Asking $32,500.  Please email me at art.awracing@gmail.com. FL
40
Transmission Related Discussion / Re: Overdrive D help
« Last post by Art on May 14, 2021, 06:31:50 AM »
Hi John,

Basically, yes, the vacuum is generated from the intake manifold. 

The URL below will take you to a UK site that has a pretty good explanation and a link within to another site with more.

http://www.mgb-stuff.org.uk/dod.htm

Hope that helps you.

Safety Fast!

Art
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