Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Mini > Mini 1 | Cooper | Countryman
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools Search this Thread
Old 04-01-2009, 12:37 AM   #1
boarder_punk
AF Regular
 
boarder_punk's Avatar
 
Join Date: Apr 2006
Location: new ulm, Minnesota
Posts: 132
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via MSN to boarder_punk
overheating

05 Cooper N/A

Car has been to multiple shops for overheating and a coolant leak. Every hose has been replaced, has new water pump, has new thermostat, has new cap. Passed multiple block tests and pressure tests. Holds 15 pounds [practically] all day. Has Mini approved coolant with proper mixture. No visible leaks anywhere.

Cooling system holds only around 8-10 psi while running. Will eventually (time varies from 10 minutes to an hour) build to 14-15 psi and then suddenly begin to overheat very quickly and drop pressure to around 5 psi. Place of leakage varies.

I'm suspecting cracked head/block or bad head gasket but shows none of the typical/easily diagnosed symptoms of these problems.

IATN or Identifix anyone? The shop I'm currently working at doesn't have either and neither do I.

Any help would be greatly appreciated.
boarder_punk is offline   Reply With Quote
Old 04-07-2009, 04:55 PM   #2
boarder_punk
AF Regular
Thread starter
 
boarder_punk's Avatar
 
Join Date: Apr 2006
Location: new ulm, Minnesota
Posts: 132
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via MSN to boarder_punk
Re: overheating

UPDATE: Apparently car only overheats during city driving. Pressure tested after heating car up. Quickly lost 5 psi with no visible signs of leakage or signs of coolant appearing externally.

After some research it was found that the car uses a 3 layer head gasket to individually regulate cylinder temperatures. The center layer can shift causing incorrect distribution of coolant and improper cylinder temperatures.

Customer authorized the head gasket job. I pulled the head off last night and the head is currently at the machine shop being cut and pressure tested for cracks. Cylinder 1 had twice the amount of carbon as the others cylinders, even through the intake port. This could indicate that this cylinder has been running at a different temperature than the other cylinders.

I will post again with the results after the car is put back together.
boarder_punk is offline   Reply With Quote
Old 04-10-2009, 08:14 PM   #3
boarder_punk
AF Regular
Thread starter
 
boarder_punk's Avatar
 
Join Date: Apr 2006
Location: new ulm, Minnesota
Posts: 132
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via MSN to boarder_punk
Re: overheating

Car is repaired. No more pressure woes, overheating or leaking. Head gasket took care of this little gremlin.

For any of you looking to do a head job on a mini, most head gasket kits do not come with intake or timing cover gaskets or seals. There is usually an intake gasket for the "S" models but not the naturally aspirated engines.
boarder_punk is offline   Reply With Quote
Old 05-03-2009, 01:02 PM   #4
Jmrec100
AF Regular
 
Jmrec100's Avatar
 
Join Date: Sep 2005
Location: Wildomar, California
Posts: 260
Thanks: 0
Thanked 0 Times in 0 Posts
Re: overheating

Thanks for the post and the final solution to the overheating problem. I am looking to buy a Mini. And looking over the posts gives me an idea what to expect with these cars.
In your opinion, does this car make a good commuter car? I drive 120 miles a day commuting to work.
Also, this post gave me insight to the problem I am having with my own car, different make.
Thanks,
Jmrec100 is offline   Reply With Quote
Old 05-05-2009, 07:15 PM   #5
boarder_punk
AF Regular
Thread starter
 
boarder_punk's Avatar
 
Join Date: Apr 2006
Location: new ulm, Minnesota
Posts: 132
Thanks: 0
Thanked 0 Times in 0 Posts
Send a message via MSN to boarder_punk
Re: overheating

Great commuter car in my opinion. Comfortable, fun to drive, decent mileage. You can even tune the "S" models to be fairly quick. A coworker of mine lives 3 hours away from the shop has an "S" with a few mods and drives it everyday. He loves it. His mods were simple and didn't noticably affect his mileage, but it is much quicker than stock.

Glad my post was helpful to you. I wouldn't be too worried about head gaskets being problematic on these cars just yet. I work on a lot of minis and have only had to do 2 head jobs. They are also a quick job, which translates to cheap (compared to a head job on most cars).
boarder_punk is offline   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD


Bookmarks
Go Back   Automotive Forums .com Car Chat > Mini > Mini 1 | Cooper | Countryman

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 11:21 PM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts