Rad Caps, Hold The Pressure In The Rad.
A bad rad cap can cause similar symptoms to a failed head gasket.
If the cap does not properly seal the cooling system, air will enter it. When air enters the system air locks can form inside the cooling hoses, thermostat and heater core. When there is air in the system the heater will fail to produce heat and the engine will not be able to retain a consistent temperature, which will cause it to overheat.
Now let’s talk about: Rad Caps.
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