[Mgs] Hood Louvers: Motivation for the Question

Paul Hunt paul.hunt1 at blueyonder.co.uk
Mon Jul 27 02:01:02 MDT 2009


Yes ... exacerbated by having to have the heater going full-blast when the V8
engine cooling was a bit iffy!

If it's cabin temperature that is the problem then first make sure the heater
*is* being turned off.  Then use the cabin fresh-air vents, cold heater
directed to the footwell, and the cold air flap open (it has *three* open
positions, although it needs a hard pull to get it to the third one).  If the
drop-glasses aren't down then at least open the rear side windows, and a tilt
sunroof gets a surprising amount of air through.  That will at least get some
air through the cabin, but if it's 100F outside then it isn't going to be any
cooler inside, other than from the slight cooling effect of moving air as
opposed to static temperatures.

Next is to see if you have any heat insulation on the tunnel, a very large
part of the hot air from the engine compartment exits down the tunnel.  From
the factory the cars had a significant thickness of silvered material stuck
down there.  Next is the left-hand floor that the exhaust system passes under,
I've heard of heat here melting peoples shoes, you should be able to put heat
insulation down here as well, ordinarily there is only a bit of anti-drum
material in the depressions under the carpet.

Louvres immediately behind the radiator rather than right at the back of the
bonnet should reduce the amount of heat exiting under the car and hence coming
through the tunnel, but it will immediately get into the cabin through the
heater, dash vents and cold air flap of course (where these are open) making
things hotter than they were before!  A shallow but wide scoop might be
better, mixing outside air with that from the engine compartment exiting under
the tunnel and so reducing its temperature.  Other than that live with it,
it's an undocumented feature of classic car ownership, modern air-con has made
us soft.

PaulH.
  ----- Original Message -----
  ...  To all GT owners...have you experienced high cabin
  temperatures in the summer?


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