Still Overheating

[xXDavidCXx]

If you install a cap that doesn't allow coolant into the reservoir, your radiator, hose, or something else in the cooling system would blow.

By design, when pressure builds to the cap pressure, the 18psi, or whatever it is, is maintained by allowing some coolant into the reservoir. If working correctly, the same amount of fluid is then pulled back into the radiator as the system cools.

What I meant to say by letting coolant into the bottle was the coolant was bubbling over into the bottle due to the pressure not holding and temp rising.

 

[Bratch]

I've been working on vehicles for 55 years or so and never needed to do that.

If I ever do, now I know.

I’m sure I learned it on here but after replacing a radiator, water pump and thermostat this is what finally solved my minor overheating problem.

 

[MikeE024]

Oh yeah, I put an18psi cap on but now I’m reading it should be 16psi?

According to what I read, 18psi is correct for your radiator cap.