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Old 4 Weeks Ago   #1
Join Date: Aug 2016
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Coolant is boiling!

A couple weeks ago my 2002 Doblo 1.9 JTD started losing collant.

Took it in and had the water pump and hosing replaced, new thermostat and new rad and expansion tank.

She was running fine for a couple days then started over heating again. When I pull over, the collant is boiling in the expansion bottle. By the time it cools down, the bottle is empty so I'm filling it with water.

This has been the cycle for a week now. Check in the morning, bottle empty. Drive 20 miles and it over heats, bottle empty. No evidence of a leak anywhere. Engine oil is fine (good color) and level never changes.

The mechanic seems to think it might be the cap on the exp tank so new one on the way.

Has anyone seen this before?
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Old 4 Weeks Ago   #2
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Re: Coolant is boiling!

Have you had a compression test done or a chemical test of the coolant which tells you if their are products of combustion in the coolant.

A head gasket problem seems most likely at this point.

Bear in mind that the cap on the coolant bottle is a a fail safe not part of the regular running of the system, it should not be regularly venting the coolant.
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Old 4 Weeks Ago   #3
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Re: Coolant is boiling!

Yeah I'm starting to think the same.

Weirdly....

If I keep the RPMs down below 2500 (which is too damn slow for me BTW) she doesn't overheat. Still looses coolant, but takes a week to notice.

SO yeah, I think the head has a very minor leak, somewhere impossible to see, not effecting the oil paths.

I'll keep ya posted
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