4AGE 16V engine overheat when at high speed

[chenfon]

(06-10-2020 12:16 PM)Dave W Wrote:  I would first do a compression check, even if you do not have milky coolant. About the only thing left is the actual radiator. You could try a coolant flush to see if that might help. Clean the rad surface, straighten out bent fins, or find a rad shop that can rod the radiator. But you probably looking at a new rad. You can confirm insufficient Flow thru the rad, by seeing if running the heater reduces the temp. You do have an over flow tank connected in your system? I know my cooling system takes 2 or 3 short runs, then topping off the over flow tank, after cool down, to be able to get all the air out of the 4AGE cooling system.
Dave W

Dear Dave, thanks on the suggestion. i have flush all the cooling system during my water pump service. Yes, i have the over flow tank on it. so far it never go empty after i had replace new radiator cap. now i suspect there will be minor leakage at piping when i at high speed = high pressure create. Did any have idea on how to check this minor leakage issue, due after i stop and engine is hot. minor water drip will direct condense and cant found any sign....tq

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(06-10-2020 12:41 PM)jondee86 Wrote:  What has been known to happen is that the return hose from the radiator can get
"collapsed" by the suction of the water pump at higher rpm. This can only happen
if the hose is old and very soft, or if the hose has started to de-laminate internally.

Some radiator hoses have a coiled steel spring fitted inside the hose to prevent
the hose being sucked flat. But if the bottom radiator hose is very soft it may be
worth while putting a new one on to see if it solves the problem. If the top hose
is also very soft, maybe replace them both.

Cheers... jondee86

Dear Jondee86, thanks on the suggestion. will the the radiator hose to replace, due current as per your mention is soft. will update the result soon after get the hose and test run. tq

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(06-10-2020 01:31 PM)Power_uP Wrote:  Before you chase your tail with cooling system checks, it might be worth checking the timing.

Dear PowerUp, i confuse now. will it be cooling system get overheat due to timing? please do explain more.... tqvm

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Dear Guys, below as some of the photo of the overhaul water cooling system parts. tq