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Heater Matrix - Airlock ?
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Alanjoanne is Offline
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Icon5 Heater Matrix - Airlock ? - 20th October 2016, 08:14 AM

Hi Guys. Can anyone tell me if it possible to flush out the heater matrix whilst it is still in the car. My daughter has a '57 plate 1.4 Mini One and the heater is blowing cold, though occasionally just about lukewarm. I suspect either a big airlock in the heater matrix or a build up of sludge and I was thinking if it possible to flush it out without removing from the car. Anyone ever done this?

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Default 17th March 2017, 10:10 AM

There is two pipes going from the engine through the bulkhead, this is feed and return to the matrix, take these off and flow water through . Simply reconnect pipes and bleed system afterwards. Hope this helps
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Heater Matrix - Airlock ?
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Default Heater Matrix - Airlock ? - 18th March 2017, 08:35 AM

I've had this before and cured it pretty simply. However, please take care as the coolant will be HOT.

1. Run the car up to temp until the fan starts.

2. Turn the heater up to hot and the fan to medium

3. VERY SLoWLY loosen the coolant cap. You may hear it hissing and then bubble. BE VERY CAREFUL. Remove the cap and gently increase the revs. You may see bubbles coming through.

4. After about 5 mins of the above, turn off and top up coolant.

5. Repeat step 3 and 4 until coolant level remains constant.

The gushing sound should then have gone and heaters working as normal.

You can bleed the system using the bleed screw but it's a PITA to get to.

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antifreeze, heater, matirx, no heat

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