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1955 Mercury Montclair Convertible, 292 V-8,


TomK
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When you say checked, did you have the radiator checked by a old fashioned radiator shop?  Are all the cooling fins on the radiator in good shape?  Is the block clean inside or full or rust debris?  Water pump impeller in good shape? Are the hoses in good shape and not collapsing when under throttle?  Is the exhaust restricted?

When does the overheating happen?  Within the first few minutes of running?  At idle?  Under heavy load?  The more information you tell us the easier it is for us to diagnosis the problem.

Good luck.

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Does the car have a gauge or a warning lamp? And it indicating overheated by that or an actual boil over condition? Might pay you to check or replace the sending unit. Also to check actual coolant temp in the radiator top tank once t-stat is open and coolant is circulating.

 

One other thing I see happening frequently in an overflow condition- these cooling systems were designed to have an expansion space in the radiator and cold coolant level should be a couple inches below the fill neck. If you're filling it to bottom of the fill neck as you would a modern closed cooling system, once it warms up it is going to expel coolant until it finds the level it wants.

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This car has a temperature gauge. It would help if TomK would tell us how long he has owned the car and when he became aware of the problem. These cars, as opposed to the 55-57 T-Birds, do not have a reputation for overheating. It could be a thermostat that isn't opening completely or the lower radiator hose collapsing when being driven at speed. I agree with Glenn a check of the actual temperature would be helpful. It could well be that the sending unit is bad. Of course, it could also be clogged water jackets. Hopefully not.

Lew Bachman

1957 Thunderbird

 

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  • 3 months later...

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