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Heater matrix?

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Old Dec 6th, 2018, 15:37   #1
Palmer
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Default Heater matrix?

Im pretty certain i already know the answer to this...

Noticed coolant had been gulped. Quite a bit.

Sodden drivers carpet. Took it out and everything was swimming. Looking at the water marks coming from the matrix. 1992 turbodiesel

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Old Dec 6th, 2018, 22:59   #2
jpliddy
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Default 940 tdi auto 1995

hi are you sure its matrix under there and not the dreaded HEATER CONTROL VALVE these are prone to failure the non air con version is hard to find now mine failed years back i did swop it myself so no that bad a job . let us know if its that or matrix
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Old Dec 7th, 2018, 15:35   #3
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Originally Posted by jpliddy View Post
....are you sure its matrix under there and not the dreaded HEATER CONTROL VALVE these are prone to failure the non air con version....
Good question Jim! I know from personal experience that both make the carpet wet in the driver's footwell. But if all the other footwells are wet as well then it's the matrix.
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Old Dec 7th, 2018, 16:24   #4
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I fixed mine with a can of K seal and it still ok 5 years on The heater matrix is a sod of a job to do.
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Old Dec 7th, 2018, 21:07   #5
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I fixed mine with a can of K seal and it still ok 5 years on The heater matrix is a sod of a job to do.
Agreed it is - took me ~5-6 hours over an entire weekend to strip out, replace and put back much of the dash and many weeks after trying to wash and dry everything out thereafter!
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Old Dec 7th, 2018, 22:55   #6
mocambique-amazone
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Palmer, what year is your Volvo?
Later they got the heater valve in the engine bay. A big improvement.

You did use the wrong coolant, I will see orange stuff. Prone to destroy the coolant system, including water pump.
A big nono
Good luck, changing the matrix is a real pita and the invoice will be at a workshop more as the value of the car
Kay
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Old Dec 8th, 2018, 00:13   #7
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Let me know should you be seeking a matrix...

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