Heater only blowing warm-ish

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  1. #1
    Help ! A few weeks back the heater in my R53 started blowing cold. I checked the coolant level and noticed it was in a very brown sludgy state. Checked the heater hoses one of which was cold,so i flushed the cooling system,took the heater hoses off and flushed and back flushed the matrix. Refilled the system with fesh coolant,bled it all and i had it toasty again. It has since gone cold again so i took the matrix out this time and flushed and back flushed it again then put it back together. Ran the engine,bled the system again and still nothing ! The matrix and the pipes are red hot,so much so you can hardly touch it. But still no hot air just warmish. Does anyone know if there is something in the heater unit that goes faulty ? Or does the heater control go faulty ? With this cold weather now i dont want drive the f###ing thing !!!! HELP !! Andy.

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  2. #2
    JCW Upgrade JOHN MILNE's Avatar
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    Not sure but there could be a heater motor resistor fitted
    Often failing on our fleet vehicles (not mini)

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  3. #3
    Site Owner MINI William's Avatar
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    What is the coolant temperature gauge showing?
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  4. #4
    Quote Originally Posted by MINI William View Post
    What is the coolant temperature gauge showing?
    Temp gauge is reading normal.

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  5. #5
    Test Passed Harmchar's Avatar
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    If it was the motor resistor you wouldn't get a change of fan speed. So if you can change speeds of fan and the matrix is hot to touch it could be there is a flap type housing that is not opening and letting the air from the fan go over the matrix. I haven't been in to my matrix yet so don't know how the MINI one works. Away to look at Google to see if there is any images.

    - - - Updated - - -

    Found this actuator on eBay. Could be why the heat is not being distributed round the vents.

    https://www.ebay.co.uk/itm/323496458867?ul_ref=https%253A%252F%252Frover.ebay .com%252Frover%252F1%252F710-53481-19255-0%252F1%253Fff3%253D2%2526pub%253D5575376664%2526t oolid%253D10001%2526campid%253D5338268676%2526cust omid%253DEAIaIQobChMIy46gneHC5gIVC7TtCh2_MAOcEAQYF CABEgKoWPD_BwE%2526lgeo%253D1%2526item%253D3234964 58867%2526srcrot%253D710-53481-19255-0%2526rvr_id%253D2228246943503%2526rvr_ts%253D2047 0def16f0aadd37352d7efff6b2f4&ul_noapp=true

  6. #6
    Fitted a new heater matrix to the car,i have heat again ! I presume the old one must be partially sludged up.

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  7. #7
    Site Owner MINI William's Avatar
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    Great that you have heat again, especially on a cold windy day like today
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