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Discussion Starter #1
may be this will sound stupid but does anyone make a cap or is there a way
to lessen the 16# pressure in the cooling system on a 94-7 4.6 tbird
or cougar cooling system. i always used a 7-9 # cap on the old systems.
thought maybe it would make the radiators and heater cores last longer.[you guys wont be the first to laugh]. have never had overheating probs yet. just
asking. thanks!--irv
i know--just unscrew the cap!
 

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irvin,

You should never put a lower pressure cap on a system that is designed to operate at a higher pressure. The lower pressure cap will vent frequently, because the cooling system will exceed its pressure capability. You'll lose coolant and eventually overheat.
 

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I have never seen any plastic screw on caps that were less than like 15 psi.
 

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Discussion Starter #5
all right dont give me any good news. got away with it for years on
cars w/regular caps. i know they don t make anything else in the
newer ford screw on. irun a 9lb cap on my bonneville now.never
had any probs over the years with anything overheating. just dont
like a lot of pressure but they all do it now. to many vehicles w/marginal
cooling systems made to run hot for emissions
 

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If you keep blowing cores, there's something very corrosive in your system, or you're mechanically breaking them going in.

You need to completely flush your system very well; after draining everything, including the block. (there's a screw-in plug in the side of the block.)

Keep flushing for a while until the water is running completely clear. Backflushing is good also; you have the lines loose at the core, run water every direction thru every water opening until it's all clean.

For anyone tempted: If you run water in your intake, you won't like it. Likewise oil fill cap; the list goes on... :rolleyes:

Let that all drain out, install everything, add the coolant, then top off with distilled water; make sure there's no salt in it. (All bottled drinking water adds salt, pretty much.)

Your tap water may have a water softener; those add salt. :)
 

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I remember some guy telling me a long time ago that a higher pressure radiator cap will make the car run cooler. I just did some checking online though and apparently a higher pressure means a higher boiling point for coolant. Is there any truth to this?
-Rob
 

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I remember some guy telling me a long time ago that a higher pressure radiator cap will make the car run cooler. I just did some checking online though and apparently a higher pressure means a higher boiling point for coolant. Is there any truth to this?
-Rob
absolutely....it is the reason that water boils at less than 212°F when you live in a high altitude area than when you're at sea level...less atmospheric pressure on the water at altitude
 

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Well good to finally get that clarified! :D
-Rob
 
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