The Thermostat problem - 2 weeks at the dealers! - MINI Cooper Forum

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post #1 of 17 (permalink) Old Apr 24th, 2012, 07:45 PM Thread Starter
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Angry The Thermostat problem - 2 weeks at the dealers!

So after not starting the other week and me having to get BMW assist out, the car threw another wobbly when the fan came on after turning it off. It stayed running til the battery went flat meaning a tow to the dealer. They diagnosed it as being a faulty thermostat but there are so many faling apparently that its a 10-14 day wait for the part! They also found an oil leak which is being repaired and they are going to do a software update for the stumbling when accelerating. In the meantime Mini have provided me with a BMW 1 series hire car (which is vile but thats another story). The most expensive car i've ever owned and also the one that lasted the least length of time before breaking down!

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post #2 of 17 (permalink) Old Apr 25th, 2012, 11:10 AM
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I hope this is the last of your troubles. Never fun when a new toy plays up. I'm collecting mine on Monday; I hope it behaves...

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post #3 of 17 (permalink) Old Apr 26th, 2012, 09:10 AM
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I had three new thermostats in mine I hate to tell you. Two resulted in the car "failing to proceed" and one was fitted when it went in for a service and I noticed the fan running for too long. The new thermostats did not prove to be a solution even when the revised design was fitted after the second breakdown. Much as I love MINIs (we've had five in our family) every one has had an issue with two breaking down and requiring recovery. I worked for a company that provided VW cars for 10 years and never once had a warranty or breakdown issue.

Sad to say it but this issue of Countryman thermostats does not seem to be sorted yet
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post #4 of 17 (permalink) Old Apr 26th, 2012, 09:51 PM
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Sorry to hear of your troubles, chromelover. Which model do you have?
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post #5 of 17 (permalink) Old Apr 26th, 2012, 10:04 PM
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Sounds like a nightmare
What model do you have and year?
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post #6 of 17 (permalink) Old Apr 27th, 2012, 05:49 PM Thread Starter
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Its a Cooper S Countryman 2WD, 9 months old. It wa sposed to be ready this evening but they called as I was about to get on the bus to say that the software update failed and they need to do it again tomorrow morning.
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post #7 of 17 (permalink) Old Jan 11th, 2016, 01:00 PM
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Mini Cooper , Thermostat Problem

My car is also at the main dealers waiting for a Thermostat.
They have said it could be up to 2 months BUT have provided a free car
Estimated cost just over 400 !
This MUST be a re- call now, there are so many people waiting, either a design or manufacturing fault, BMW/Mini should cover the cost
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post #8 of 17 (permalink) Old Jan 15th, 2016, 10:42 PM
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hi jamesbonze just wondered what age mini you have ?and did you just have the fan coming on fast when car stopped or did it overheat?.
We have just got a countryman sd on 2013 plate and I have noticed that 3 times at random even when cold the fan runs on after engine off.Last time I popped bonnet open and fan was going crazy and engine seemed hot even though it was freezing cold.Ive always owned Japanese cars and never heard a fan in the winter before seems like our thermostat is not opening sometimes or the temperature sensor is sending faulty signal making the fan come on.just wondered james what your symptoms are? and what engine you have ?.why 2 months to change thermostat james I know its not easy to get to but wow two months,parts shortage?.
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post #9 of 17 (permalink) Old Jan 21st, 2016, 05:53 PM
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Hi all, currently having the same problem with my Mini JCW phoned mini and my dealer both are saying there is no recall!

Basically they are asking that I book it in for a diagnostics check at a pro rata cost of 99!

If anyone has any advice I would very much appreciate it
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post #10 of 17 (permalink) Old Jan 21st, 2016, 07:52 PM
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hi Anthony we have had our mini countryman for a month now and we have noticed the fan running twice with the engine off.
Both times this happened it was really cold,and the car was not standing so why the fan should need to come on I'm not sure unless the thermostat was not opening enough.Time will tell when the weather is warmer if this is normal or a fault .whats the symptoms of your mini Anthony fan overrun?.

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post #11 of 17 (permalink) Old Jan 22nd, 2016, 08:09 AM
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I had this trouble a while ago on my 2012 N18 MCS before the thermostat swap.

A poster on NAM gave a very good explanation of what the trouble seemed to be because it seemed to occur more in the US, possibly encouraged by a warmer climate? Also I seem to remember they found some wiring which came rather too close to hot engine parts in one of the new variants which certainly coincided with the temp sensor repositioning 'fix/recall'...

"To understand what is going on here, you have to understand that there is a temperature sensor that tells the ecu what the temperature is, and a mechanical thermostat that opens at a certain temperature and regulates water flow and therefore the temperature.

What is supposed to happen is that the mechanical thermostat is set to 105C (221). When the car is moving with good radiator flow the temp should stay at roughly 105. Once the temperature goes > 106 (223) the electric fan cuts in. This usually because the car is stationary, with no airflow.

The problem is that the mechanical thermostats seems to be a little inaccurate and out of sync. There are a whole lot of thermostats that seem to run at 107-108C (224-227F). What happens in this instance is the thermostat doesn't open water flow properly until it reaches its temp, so driving around the temp will be 107-108C. This confuses the ecu, as the temperature sensor reads >106, so it activates the fan.

It is also possible to have the reverse problem, ie an accurate thermostat but a miscallibrated temperature sensor which reads the water temp higher than it actually is, which can produce exactly the same problem.

If this is happening, the fan is not just running when you stop the car, but nearly all the time, even driving around. When you stop it will run until the temp drops to the 106C number.

So if you are lucky and have a "normal" thermostat that runs around 104-105C you won't get the fan operating when you stop very often. If you have one of the thermostats that runs at 106-108C you will get it a lot."

It seemed there was a quality control mismatch.
BTW the loud 'second stage' fan will usually come on for a while (always much less than 5min for me) after you've had the air-con on...

Last edited by cjm; Jan 24th, 2016 at 08:34 AM.
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post #12 of 17 (permalink) Old Jan 23rd, 2016, 05:28 PM
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CJM, thanks very much for that detailed explanation I can't be sure which way round mine is but will go for a spin tomorrow.

The dealer did admit to me that the part was on backorder and couldn't be sure when its coming back in stock so I'm in two minds what to do. I suppose its gonna come down to me booking it in then waiting for the part to come available but its very frustrating when it seems to be a massive problem for them!

Speedy Mini, mine doesn't seem to worry about what the temperature is outside or how long I've driven for I've driven 5 mins and 2 hours non stop, both times I've turned the engine off and the fan runs for at least 5 mins. I'd say it runs after I've been out in the mini around 80% of the time. Sometimes ill get an increased battery discharge warning when I next drive as well.

To add to that recently she hasn't started 3/4 times due to a flooded engine. Easily sorted by taking the fuse out to the fuel pump and turning it over and quickly getting the fuse back in before the fuel disappears but I should have to do this on a 61 plate I feel! Its slightly better when putting in the 99 oct fuel (which I use 99% of the time) but still very poor in my opinion.

I also can't help but think these are all connected. Anyway thanks for listening to my rant.
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post #13 of 17 (permalink) Old Jan 27th, 2016, 07:47 AM
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The fan in ours was on for 5 minutes after a short run , Seems our thermostat may be a problem too.
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post #14 of 17 (permalink) Old Jan 27th, 2016, 07:31 PM
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Someone I know worked for BMW and has a 2009 cooper S. His thermostat went 5 weeks ago and is still sat at the dealers where he worked when it went wrong. He has now changed jobs and it's still there waiting for the part. Seems the thermostat it is now on worldwide backorder without a due date for delivery and he is running around in a big 5 series BMW courtesy car till he gets it back. One unhappy bunny.
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post #15 of 17 (permalink) Old Jan 28th, 2016, 09:08 PM
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Hi Guys had mine fixed Tuesday and so far so good. The guy ordered a similar thermostat from Eurocarparts and then ordered a wire loom from mini to fit it. He told me most mechanics should be able to do this but Im happy to pass his details on should anyone want them. I think they have been on backorder since November and they claim its a main dealer part so why not. Cost me 200 all in.
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