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  '64 1/2 to '73 -- The Classic Mustang
  Radiator Pressure/Heater Core

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Author Topic:   Radiator Pressure/Heater Core

Posts: 169
From: Maryland
Registered: Apr 2000

posted 08-09-2002 11:02 PM     Click Here to See the Profile for bifs66   Click Here to Email bifs66     Edit/Delete Message   Reply w/Quote
At 500 miles, the heater core in the Fastback gave up. I'm running a 16 lb cap (came with the Howe radiator) and was concerned that after installing a new core, it will break again. However, the leaky core was of unknown age; but looked OK and pressure tested to 15 Lbs at the time I rebuilt the heater box. Anyone have to deal with mixing early Mustang heater cores with modified/upgraded engines and cooling systems.

Bernie Frank
66 Fastback restomod project
85 GT (preserved)
82 GT (original)

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V8 Thumper

Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 08-10-2002 02:42 PM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
I'm running a 7 lb. cap on mine

One pound of pressure = 3 more degrees of boiling point. Example: 16 lb. cap would put the boiling point at 260 ... 16x3=48, + 212. Do you intend on running your motor any where near 260?

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Posts: 2623
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99

posted 08-10-2002 11:14 PM     Click Here to See the Profile for kcode   Click Here to Email kcode     Edit/Delete Message   Reply w/Quote
My guess is that your heater core was due for replacement any way. I had one do the same thing but at 6000 rpm in first gear on a drag strip. I replaced it and have not had any problems since, about 4 years ago.


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