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mini cooper s 2000 overheating

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Terrybrennan76
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mini cooper s 2000 overheating

Post by Terrybrennan76 » Mon Jul 20, 2020 1:20 pm

After a period of storage i have started using my mini Cooper S Again 00 G 23


After a short while the expansion tank starts bubbling .

i have checked the following
thermostat replaced
new coolant
Head Gasket oil clear no evidence of a damaged or blown gasket
fan cutting it at temperature but not colling it down sufficiently



any ideas what next ?


Terry



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woody
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Re: mini cooper s 2000 overheating

Post by woody » Mon Jul 20, 2020 3:05 pm

As the car has been sitting up the first thing to check is that the stat is opening.
MPi engines run a normal temperature around 100 deg. C so it is important that the cooling system holds pressure as water boils at a higher temperature under pressure. Is there any steam coming out. MPi expansion bottles are known to crack where the hoses join the tank.
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Billy
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Re: mini cooper s 2000 overheating

Post by Billy » Mon Jul 20, 2020 3:07 pm

Terry,

What thermostat are you using? Mpi's run hotter than carb Minis. I had overheating problems with my old 98 mpi but it was a common problem with a sensor which was activating the fan. There was a factory upgrade which cured it. The other possibility is that your 20-year-old rad has silted up.

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Billy
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Re: mini cooper s 2000 overheating

Post by Billy » Mon Jul 20, 2020 3:08 pm

Woody beat me to it.

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Billy
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Re: mini cooper s 2000 overheating

Post by Billy » Mon Jul 20, 2020 3:10 pm

The other known issue is the quality of the expansion tank tops. As Woody says, the system needs to be pressurised to work properly.

Terrybrennan76
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Re: mini cooper s 2000 overheating

Post by Terrybrennan76 » Tue Jul 21, 2020 12:15 pm

Thanks guys


rad checked and ok
upgraded stat and its working
no evidence of blown gasket

the hunt goes on .

hope ye are all well during these terrible times
Terry

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Re: mini cooper s 2000 overheating

Post by jpmcc » Thu Jul 23, 2020 10:33 am

Try replacing the coolant header tank cap, I replaced mine with one from a 2006 Mini Cooper S.

Instantly stopped any heating issues on my 2000 Sportspack 8)

Terrybrennan76
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Re: mini cooper s 2000 overheating

Post by Terrybrennan76 » Mon Jul 27, 2020 2:22 pm

thanks guys im taking a few days off this week and will get stuck in to it

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Re: mini cooper s 2000 overheating

Post by DOUGAL » Tue Jul 28, 2020 11:13 pm

Check the cooling fan speed. It may be cutting in OK but may not be turning fast enough. I had this problem with one turned out to be bad earth to fan. 9
DOUGAL

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