Jump to content


Photo
- - - - -

Mini Overheating


  • Please log in to reply
15 replies to this topic

#1 Stum3

Stum3

    Learner Driver

  • Noobies
  • PipPip
  • 15 posts
  • Location: Lancs

Posted 12 May 2018 - 06:49 PM

Hi Guys my 1977 1275 GT is overheating very quickly, i have recently changed the water pump

 

the top hose seems cold and i can see water/steam coming out of the thermostat housing at the bottom

 

when the temp get just above half way the expansion tank is being filled with hot water and spurting out.

 

i am hoping its just a stuck thermostat (and not head gasket) any ideas

 

Thanks

 

Stu



#2 CityEPete

CityEPete

    Up Into Fourth

  • Members
  • PipPipPipPipPipPipPipPipPip
  • 3,597 posts
  • Location: On my soapbox....

Posted 12 May 2018 - 07:26 PM

Have you got a compression tester?

#3 Swift_General

Swift_General

    One Carb Or Two?

  • Members
  • PipPipPipPipPipPipPip
  • 777 posts
  • Location: England

Posted 12 May 2018 - 07:28 PM

Yep - pop the thermostat out and test it before you do anything else.

#4 cal844

cal844

    Crazy About Mini's

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 5,363 posts
  • Local Club: www.scottishmini.net

Posted 12 May 2018 - 07:48 PM

Remove the thermostat (fit a new gasket)

Edited by cal844, 12 May 2018 - 07:48 PM.


#5 mr3speed

mr3speed

    Speeding Along Now

  • TMF+ Member
  • PipPipPipPipPip
  • 395 posts
  • Location: London

Posted 12 May 2018 - 10:12 PM

Are you matrix heater hoses higher than your radiator?

#6 Rorf

Rorf

    Mini Mad

  • TMF+ Member
  • PipPipPipPip
  • 298 posts
  • Location: Cape Town

Posted 13 May 2018 - 06:16 AM

First things first - was it overheating before you changed the water pump, what was wrong with the previous water pump? What condition was the water/coolant when you removed the pump. Did you flush the system especially the radiator.



#7 Stum3

Stum3

    Learner Driver

  • Noobies
  • PipPip
  • 15 posts
  • Location: Lancs

Posted 13 May 2018 - 08:23 AM

Have you got a compression tester?

No i dont unfortunately



#8 Stum3

Stum3

    Learner Driver

  • Noobies
  • PipPip
  • 15 posts
  • Location: Lancs

Posted 13 May 2018 - 08:24 AM

First things first - was it overheating before you changed the water pump, what was wrong with the previous water pump? What condition was the water/coolant when you removed the pump. Did you flush the system especially the radiator.

I Have never run it up to temp before due to the water pump (only just bought it as a project) the coolant was a rusty colour and no i just refilled it thanks



#9 area51

area51

    Learner Driver

  • Noobies
  • PipPip
  • 20 posts
  • Location: Lancashire

Posted 13 May 2018 - 08:40 AM

I good idea is to remove the heater matrix and flush that out too.



#10 Stum3

Stum3

    Learner Driver

  • Noobies
  • PipPip
  • 15 posts
  • Location: Lancs

Posted 13 May 2018 - 08:48 AM

Are you matrix heater hoses higher than your radiator?

Yes one of the matrix heater hoses does loop above the rad level



#11 mr3speed

mr3speed

    Speeding Along Now

  • TMF+ Member
  • PipPipPipPipPip
  • 395 posts
  • Location: London

Posted 13 May 2018 - 09:06 AM

This can cause over heating due to air locks, get them lover than the fill level and see if that helps

#12 Northernpower

Northernpower

    Mr. 7-Port

  • TMF Team
  • PipPipPipPipPipPipPipPipPip
  • 2,306 posts
  • Name: Graham
  • Location: North Yorkshire (God's County)
  • Local Club: Its out there somewhere

Posted 13 May 2018 - 10:06 AM

Hi Guys my 1977 1275 GT is overheating very quickly, i have recently changed the water pump
 
the top hose seems cold and i can see water/steam coming out of the thermostat housing at the bottom
 
when the temp get just above half way the expansion tank is being filled with hot water and spurting out.
 
i am hoping its just a stuck thermostat (and not head gasket) any ideas
 
Thanks
 
Stu

How can you see water/steam coming out of the thermostat housing?

#13 Stum3

Stum3

    Learner Driver

  • Noobies
  • PipPip
  • 15 posts
  • Location: Lancs

Posted 13 May 2018 - 10:22 AM

 

Hi Guys my 1977 1275 GT is overheating very quickly, i have recently changed the water pump
 
the top hose seems cold and i can see water/steam coming out of the thermostat housing at the bottom
 
when the temp get just above half way the expansion tank is being filled with hot water and spurting out.
 
i am hoping its just a stuck thermostat (and not head gasket) any ideas
 
Thanks
 
Stu

How can you see water/steam coming out of the thermostat housing?

 

Hi It was coming out of the joint of the housing and top of the head



#14 cal844

cal844

    Crazy About Mini's

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 5,363 posts
  • Local Club: www.scottishmini.net

Posted 13 May 2018 - 10:30 AM


 

Hi Guys my 1977 1275 GT is overheating very quickly, i have recently changed the water pump
 
the top hose seems cold and i can see water/steam coming out of the thermostat housing at the bottom
 
when the temp get just above half way the expansion tank is being filled with hot water and spurting out.
 
i am hoping its just a stuck thermostat (and not head gasket) any ideas
 
Thanks
 
Stu

How can you see water/steam coming out of the thermostat housing?
 
Hi It was coming out of the joint of the housing and top of the head

Take the housing off, make sure there's a gasket in place then refit

#15 Stum3

Stum3

    Learner Driver

  • Noobies
  • PipPip
  • 15 posts
  • Location: Lancs

Posted 13 May 2018 - 12:08 PM

There is a engine steady bracket over the thermostat seems solid wont budge

 

do i need to remove this at the bulkhead end there is a nut there but seems very hard to access?

 

Thanks






1 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users


    Bing (1)
Mini Spares