Coolant does not return to rad from overflo

80

Asked by Aug 18, 2017 at 04:18 PM

Question type: Maintenance & Repair

I have a 2008 pt cruiser. Have changed rad
cap, hoses and thermostat and pressure is
good. Coolant flows to overflow but not
back to rad when cool. Car will overheat
when I drive for like 3+ hours at highway
speed

4 Answers

80

Rad is one year old as well

134,625

Maybe you have the wrong type radiator cap.

80

Have a new one and according to the computer at part store it's for this car and was the only one listed

134,625

A leak in the system will cause the cooling system not to develop the vacuum necessary to pull the coolant back into the radiator. https://jimdinner.wordpress.com/2012/07/09/radiator-caps-explained/

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