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[Sebaz]

Is the rubber washer on the cap in good condition?

Did you have the problem before the new pump was fitted? If it is suspect then you probably just need to dive in and take it out to inspect it.

No problem until new timing belt and water pump and pulleys

[Andy H]

Is the rubber washer on the cap in good condition?

Did you have the problem before the new pump was fitted? If it is suspect then you probably just need to dive in and take it out to inspect it.

No problem until new timing belt and water pump and pulleys

Hmmm

It is not unusual for new water pumps to fail soon after being fitted unfortunately

[TestOmega]

Could you clarify the coolant strength versus fan operation for me, please?
Do the fans come on more or less as coolant strength increases?

Ron.

Ron I know the fans are not activated by coolant strength.

However the time it takes to reach the trigger point for activation of fans is related to efficiency of cooling and also to the heat carrying and transfer capacities of the coolant as it circulates. What I noticed in my car was that I had proper Dexcool mixture at one time. I flushed it and for replacement I used Prestone Orange Dexcool compatible coolant. In this situation I was reaching the trigger point for cooling fans much faster and quite frequently. However I never had a a boil-over or steam-over.

I hope that clarifies my comment or post and answers your question.

Regards.

[Bigron]

Yes thanks; in other words, it relates to coolant efficiency?
Once upon a long time ago I had a slight(!) overheating problem with my Carlton 2.2 petrol and added a product called "Water-Wetter", by the Red Line Oil company, which claimed to lower the coiolant temperature by 10 degrees C or more - and it did!

Ron.

[Doctor Gollum]

Thermostat needs to be fitted and working in order for the cooling system to function correctly...

I would wager that if you drive the car with the gearbox locked in 2/3* rather than D, it wouldn't blow the coolant out

* 2nd for urban roads, 3rd for highway speeds

[tidla]

Just had a similar thing on my van. Pipes were not pressurizing thou so new coolant cap sorted it. 

[Sebaz]

 
I (cross my fingers) think i've fixed it. The reservoir cap was bad, the rubber part had a split in it. Put on a new cap and it hasn't happened. I let it run for about 30 minutes then drove it and nothing coming out.
Thanks 

[BazaJT]

Hope that sorts your problem Nice easy,cheap fixes are always a plus point

[Sebaz]

Hope that sorts your problem Nice easy,cheap fixes are always a plus point

yes, I wish  I had tried it before I fought with the thermostat, before I tried the thermostat I let the car sit for almost a year just moving it around thinking the head gasket was blown.