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Bluexr3ilee

Coolant over pressurising

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Evening all, need to pick your brains 

So as most of you have seen the last few years I’ve been having issues with keeping my coolant in my engine bay 

but i’m Starting to run out of ideas now.

So after at lot of diagnosing and running tests I found that the only thing I could find was my head pressures were all over the place. I decided on replacing the head, head skimmed and valves lapped lovely jubbly.

New timing belt, tensioner,  head gasket, water pump etc etc.

So today I was doing the last finishing bits before I could run it, head pressures are 140 on all four cylinders.

Started the car and after 5-10 mins coolant was over flowing out of the expansion tank but the fan didn’t cut in once, so checked all the pipes and topped up again with coolant and started it up but this time I switched the fan on manually. It sat there running for 25 -30 mins not a problem, I was going round with a laser temp gauge checking pipe temps and they were all between 50 - 70’c and thermostat was around 88 ish. I thought sweet it’s all ok, I then switched the fan off and with 3 mins coolant was flowing out the expansion tank again.

As soon as I switched it off I checked the coolant temp in the tank and it was around 40 -50’c. It’s not really boiling over it just seems to find this pressure when the fan was switched off.

I’m just wondering if you guys had any ideas or came across this as I’m at a loose end

Lee

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Hi m8 what engine do you have CVH? etc

Any mods to the engine?

Have you flushed the rad - check its got flow through it - dose the bottom hose get warm?

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Alright bud,

Its a efi Cvh turbo from a fiesta rs running a stage 2 t3 turbo.

Aluminium rad, beige injectors, 195 superchip.

Yeah rad was flushed through and bottom hose was warm.

Lee

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i had this once and it was down to an air lock in the engines water system but that was on a zetec we cured it by just running the engine on a very steep slope.

might be worth a go

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Evening guys, played around with the car again yesterday. Flushed out the heater matrix (in case that had anything to do with it) but no joys, still the same. Lasted 25 mins with the fan off this time.

I have managed to get hold of a sniffer kit to see if there’s any exhaust gases getting through. Hopefully try that tomorrow after work.

would love to try that buddy but the cars got no ticket or test

Edited by Bluexr3ilee

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Is there a smell in the coolant of oil if so I recommend a cometic (stainless steel head gasket)  I had a similar problem with my escort rs turbo 5 or 6 years ago,I blew three head gaskets in 12 months . I tried most things like you have,problem is you don’t know how many times the head has been skimmed, and that changes the compression,so you have to build the layers back up to give you the right compression. Mine has been fine since. It may not be your problem but it is a fact that reskimming heads does change the engines compression if done a few times and if you have upgraded the performance even more so. Good luck.

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On ‎25‎/‎03‎/‎2018 at 22:02, Bluexr3ilee said:

Alright bud,

Its a efi Cvh turbo from a fiesta rs running a stage 2 t3 turbo.

Aluminium rad, beige injectors, 195 superchip.

Yeah rad was flushed through and bottom hose was warm.

Lee

Lee is the fan coming on when it gets hot?

If not have you changed the sensor

Overheating is common problem with some performance mods

Is the turbo closer to the Ali Rad?

Any pic's of the engine bay

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There's no strange smells in the coolant tank or in the rocker cover.

Instead of using my original head I bought a replacement.

The fan doesn't get chance to come on before it over pressures. The temp gauge reads between the "r & m" on the dash when it happens.

I'll try send a photo 

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What colour thermostat have you got in,if I remember some are purple , might be worth changing it ?

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TBH that's sounds like head gasket

Do the pipes feel hard soon after starting?

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Evening people, Well after a lot of testing and mucking about it turns out it was the heater matrix. It was blocked with only a slight flow of water passing through.

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That’s one to remember lee, glad you got it sorted.

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