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Heater Only Blowing Out Cold Air - 1987 Mini Mayfair


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#1 praveensridhar

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Posted 19 November 2020 - 03:32 PM

Hello folks,

 

I am very new here - got my 1987 Mini Mayfair yesterday and registered on this forum today!

 

I noticed that my heater does not seem to be working as it should. The blower works (Car/Screen) but only cold air seems to be coming out of it! 

 

Checked the pipe that goes from the heater valve in the bonnet (see yellow arrow in the below picture) and it appears to be warm. 

 

What other checks can I do myself before I drive down to a specialist? Any help would be much appreciated!

 

Thanks in advance.

 

Stay safe!

 

Praveen

 

Attached File  Capture.PNG   844.6K   3 downloads

 

 



#2 Majormallock

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Posted 19 November 2020 - 07:24 PM

Worse case scenario is the matrix is corroded to the point of completely blocking the vanes as happened to mine, to replace you have to remove the complete unit from the car and split in 2 down the middle. Alternatively check the the wire operating the valve on top of the unit hasn't disconnected in the off position

#3 Majormallock

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Posted 19 November 2020 - 07:26 PM

Sorry last part of suggestion is wrong your valve is in a different position than mine (1997) yours clearly accesable

#4 Quinlan minor

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Posted 19 November 2020 - 07:47 PM

It may well have an airlock stopping the flow.

With engine cold, close the heater valve, disconnect the hose and, holding it as high as possible, fill the hose from a jug, jiggling the hose occasionally. Once it's full, put your thumb over the end and hold it, quickly reconnect to the heater valve. Open valve and run engine up to temperature and see if that has resolved the issue.

If it doesn't, there is a way to pressure-purge any airlocks but I would not recommend it unless you are fully, mechanically competent.



#5 MiniMadRacer

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Posted 19 November 2020 - 08:00 PM

Is that heater valved fully open.... the Pic is not clear to me but it looks partially closed....at the engine work that valve gently in and out and make sure it is fully open...ie pulled as far towards the front grill as it will go..



#6 andyapanel

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Posted 20 November 2020 - 10:12 AM

If the valve is working, the matrix might be blocked. Try reverse flushing it.

Good luck



#7 kit352

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Posted 20 November 2020 - 07:36 PM

Make sure the coolant level is where it should be as well.

#8 JCmini

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Posted 22 November 2020 - 04:44 PM

My guess is faulty heater valve or its not fully open. 



#9 some1158

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Posted 22 November 2020 - 04:58 PM

If you're sure the valve is fully open then gently squeezing the tubes leading through the engine bay to/from the heater, with the engine running at temperature and the radiator cap off, can also sometimes help






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