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Re:Overheating
- CC Baxter
- Visitor
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Public
16 Aug 2019 10:58 - 16 Aug 2019 11:03 #212162
by facade
If it suddenly breaks, go back to the last thing that you did before it broke and start looking there
Replied by facade on topic Overheating
I'd still look at the radiator cap, there are 2 valves and 3 seals in it
1 - seals the rim of the radiator, so air cannot get into the radiator when the coolant contracts.
2- seals the top of the radiator, this is the pressure valve, when the coolant expands it lifts and allows coolant to the expansion tank
3- one way valve/vacuum break, when the coolant contracts, this allows atmospheric pressure to push coolant from the expansion tank back into the radiator.
If coolant doesn't get back, then there are really only 3 main possibilities
As Keithy suggests, the expansion hose is acting one way- I'd expect the car hoses to collapse though and air to rush in when the radiator cap is undone.
The seal (1) is missing/faulty, and air is leaking back into the radiator in preference to water getting pushed back. I'd expect to see signs of water leakage around the cap too.
There is a head gasket leak. A give away is when cold, the radiator hoses are still pressurised firm, and when you slacken the cap, you get a hiss of escaping gas.
1 - seals the rim of the radiator, so air cannot get into the radiator when the coolant contracts.
2- seals the top of the radiator, this is the pressure valve, when the coolant expands it lifts and allows coolant to the expansion tank
3- one way valve/vacuum break, when the coolant contracts, this allows atmospheric pressure to push coolant from the expansion tank back into the radiator.
If coolant doesn't get back, then there are really only 3 main possibilities
As Keithy suggests, the expansion hose is acting one way- I'd expect the car hoses to collapse though and air to rush in when the radiator cap is undone.
The seal (1) is missing/faulty, and air is leaking back into the radiator in preference to water getting pushed back. I'd expect to see signs of water leakage around the cap too.
There is a head gasket leak. A give away is when cold, the radiator hoses are still pressurised firm, and when you slacken the cap, you get a hiss of escaping gas.
If it suddenly breaks, go back to the last thing that you did before it broke and start looking there
Last edit: 16 Aug 2019 11:03 by facade.
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