coolant pressure

[Skip202003]

I have a 93 tempo. Replaced thermostat recently, and a leaking heater hose 2 days ago. there is no flow to or from the reservoir, and when the car is driven, the temp gauge goes down to cold or below, but when it sits and idles it appears to work OK. Also I get plenty of heat from the heater in the car. My question is what is the pressure supposed to be at operating temp?

[danielsatur]

The boiling point of water is 212f, coolant and a pressurized cap will help
increase the boiling point.

The thermostat opens 180-195f, and a cap opens around 7 lbs.
A coolant testor will show how much protection befor boil over.

It might be time for a new radiator cap too!

[Skip202003]

Thanks. My cap is rated for 16 lbs. I think I'll replace it. What reason would there be for installing a higher pressure cap?

[danielsatur]

To increase the boil point, and loss of coolant.

Consider using a Prestone flush kit , using water pressure to force out air lock!
Back flush heat core, clean bugs, and leaves in front of of Air cond condenser core +
Radiator.

Note - Make sure fans are turning on at proper temp.