overheating and radiator under vacuum?
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overheating and radiator under vacuum?
so i have stated before the problem with the temp spiking to 240-250 for 5 min at start then dropping to just below 200 then stays around 200-220 so I went to check my coolent level and the top radiator hose looked like it was squished together it was almost flat when I took off the radiator cap it was under vacuum and the top hose expanded back to a normal size. I have added about a gallon of coolent so far and it is still doing this and is low on coolent again. there is also a hissing sound coming from the radiator cap wile its running and up to temp. it has a new radiator and watter pump. any idea what causes this? oh and I also hear a watter rushing sound on the pass. side inside the cab when I first start it up. I just dont want to take it to a shop yet and dont want to throw parts at it.
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Re-read the original post. The TOP hose is getting sucked flat. Bottom hose is suction side.
The radiator cap does two things:
1. Maintain a max of 16 PSI in the radiator when it is hot.
2. Allow the radiator to draw coolant back in, as it cools off when you shut off the engine.
His isn't doing number 2. So, you build a vacuum inside the cooling system. Lower hose has a spring in it to prevent collapse, upper hose does not.
replace the radiator cap.
The radiator cap does two things:
1. Maintain a max of 16 PSI in the radiator when it is hot.
2. Allow the radiator to draw coolant back in, as it cools off when you shut off the engine.
His isn't doing number 2. So, you build a vacuum inside the cooling system. Lower hose has a spring in it to prevent collapse, upper hose does not.
replace the radiator cap.
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