Quote:
Originally Posted by DaBlue1
The cap has two seals. The outer or upper seal, seals the radiator, the inner or lower seal, seals the filler neck. The spring holds the inner seal down and keeps the pressure at 16 psi. If the spring is weak it will allow coolant to go past the seal and exit thru the overflow hose. Another owner had the same problem as you. he changed out the thermostat and fan switch and found out his cap only tested @ 1 p.s.i.
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Ok how do I test the cap?