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Cooling water blowing out

Hi,

I have a 98 Navara ( Frontier ) Diesel Pickup, 2.5TDI engine and since a while now I have to refill my coolant after every trip. Apparently the pressure becomes soo high that the overflow valve can't take it anymore, and it sprays out. I've already done the following:

- changed the radiator , it shows the same reading, 0.9 bar

- tested the air in the radiator after a test run for carbon monoxide, with a tester, which would show a opening from the gasket into the coolant, leaking compression. This test came back negative. There's no oil in the water either, so I'm out of guesses... Any idas, hints, suggestions?

g
Reply to
Gijs Wuyts
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Reply to
Gijs Wuyts

Your radiator could be clogged or your thermostat is stuck in the closed position. When was the last time you flushed your radiator?? Changed your thermostat?? YOu might want to check those two items before you proceed any further. Hope this helps... ID

Gijs Wuyts wrote:

Reply to
Idlafie

Coolant delivery problem (ineffective water pump, bad thermostat, collapsing supply hose from radiator, slipping drive belt, etc.), defective fan switch/temp sensor, circulation issue inside the motor (partially blocked passage) allowing localized hot spot to boil coolant, etc.

It appears that you replaced the radiator cap (not the radiator?). Don't rely on the new cap being within spec. Pressure test it to verify.

If a properly functioning bypass valve in the cap is allowing coolant/pressure to vent it is the result of pressure buildup in the system. That could be from cylinder pressure escaping into the cooling system, or pressure from expanding/boiling coolant. I can't envision other causes.

Louis

Reply to
Louis Bybee

tnks for your input. I've used a test kit to see if any CO might find a way into the coolant ( compression leak in the gasket) it the test fluid stayed blue (so no CO in the coolant system I guess)

g
Reply to
Gijs Wuyts

Reply to
Jon Smith

Got any combustion chamber byproducts in your coolant?

Reply to
Meat-->Plow

you usually want to start with the least expensive thing, like a thermostat.

Reply to
NissTech

Not that I know of.

Reply to
Gijs Wuyts

Test the cap?

Anything seeping out the weep hole on the water pump?

Heater core/hoses leaking? Does it smell like antifreeze or get a sticky film on the window when you use the defogger?

Also check the hose to the overflow tank for loose fitt> Not that I know of.

Reply to
E. Meyer

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