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Engine coolant bottle leak (7 replies)

cris_19010689
11 years ago
cris_19010689 11 years ago
cris_19010689
11 years ago
cris_19010689 11 years ago

Had the car idling in the garage for around 20 mins today. Returned to find steam coming from under the bonnet. I opened the bonnet and the coolant bottle was empty (all the contents all over the garage floor)

I think either the bottle or the seal around the hose that links to it has a leak as this was healthily smeared with coolant. It's a cooper sport mpi engine (model year 2000). is this a common problem?

Cheers, Chris

hawaiianblue
11 years ago
hawaiianblue 11 years ago

It's a common problem on 'any' car if the coolant hasn't been flushed every so often. The cap may be faulty, but it may just be the cooling system needs a good flush out and new coolant.

marinesparks
11 years ago
marinesparks 11 years ago

im hoping the coolant wasnt frozen... and caused other problems !!:(

hawaiianblue
11 years ago
hawaiianblue 11 years ago

The cooling system on any car is pressurised, the cap has a relief valve in it to stop the system exploding.

To flush the coolant, get the engine warm (not hot), with the heater control in the hot position, then pull the hose off the bottom of the radiator to drain it out, if it's never been done before it will be like brown snot in there. Put the hose back on and refil with water, it would be worth getting a bottle of cooling system cleaner from halfords and following the instructions on that. A hose pipe will let you back flush all the hoses and get as much muck out as possible.

surfblue63
11 years ago
surfblue63 11 years ago

Sounds like it could be a head gasket, as suggested get a compression test to check that none of the cylinders are low on compression. 🙁

cris_19010689
11 years ago
cris_19010689 11 years ago

I did notice a couple of days ago that there was a hissing noise coming from the bottle after the engine had been running. It seemed like there was pressure building in the bottle and this was released when I opened the cap.

I think I will try to take the bottle off to check the underside for leaks. How would you suggest flushing the coolant (what's left of it) through the engine? Would it be best just to top up with fresh coolant, assuming there are no leaks to be found?!

Thanks for the guidance btw guys - happy xmas

marinesparks
11 years ago
marinesparks 11 years ago

may be also worth checking compression of each cylinder just in case, this cold weather can cause all sorts of problems

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