biltonjim wrote: I can’t answer as to whether the cap is different to car caps. There was a post on here a while ago about renewing the rubber seals on the original cap.
Surely the pressure rating of the cap only determines the boiling point of the coolant, and not the operating temperature of the engine, in which case the cause of your overheating may lie elsewhere.
True. rad caps only affect the boiling point of the coolant. The operating temp is determined by the thermostat. You may have introduced some air in the system when changing the cap out which may have caused a circulation problem.
One thing to watch for when selecting a different product to replace the original is Fit Form and Function. In this case Fit my be a problem. If the relaxed height of the new cap is taller than the original and then to install the spring of the cap is compressed more than the original cap would be, the breakout pressure of the rad cap may be higher, meaning the psi rating of the cap my be higher than the stock cap. Same thing in the opposite direction ( if the relaxed height is lower)
