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Old 02-15-2015, 11:02 AM
Joe Johnston Joe Johnston is offline
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I have the 56 Shop manual handy and it states:

"The cooling system of the passenger car is pressurized at approximately 13 psi."

on page 115. Subsequent pages make no mention of a cap for Thunderbirds.

Page 363 in the spec section states:

"Cooling system on all cars is pressurized to 12-15 pounds."

This section does give Thunderbird specific specs, but no mention of a different rating for the cap on a Thunderbird, but I will check other sources.
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