Heater matrix problem - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 18 (permalink) Old 01-01-2017, 12:29 PM
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Location: Derbyshire, UK
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I am in the process of swapping my dash on a 71 spider and have decided to give the heater a quick refurb.. i.e. a new Valve and a new matrix.... Could any one tell me how you could test the heater motor whilst it is out the car? would it run straight of a 12v battery?

Appreciate any advice..
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1971 Alfa spider 1750............
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post #17 of 18 (permalink) Old 01-01-2017, 02:23 PM
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Does the fan spin freely by hand?

Black wire to ground
12v to both the other terminals for fast fan (or just the terminal not connected to the power resistor on the motor - yellow on my original motor).
12v to the terminal connected to the power resistor on the motor, for slow fan - red on my original motor

Good luck, hopefully yours is not seized or burnt out like mine (75 junior)

Also worth noting the position of the arm/cables on the heater control valve (in the cold and hot positions) - to make it easier to set-up the new valve
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post #18 of 18 (permalink) Old 01-01-2017, 02:31 PM
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Great, thanks... yes it spins freely and having just tested it is working on both fast and slow... I assume if it is working ok generating a decent blower to leave as is?


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Originally Posted by malcolm1 View Post
Does the fan spin freely by hand?

Black wire to ground
12v to both the other terminals for fast fan (or just the terminal not connected to the power resistor on the motor - yellow on my original motor).
12v to the terminal connected to the power resistor on the motor, for slow fan - red on my original motor

Good luck, hopefully yours is not seized or burnt out like mine (75 junior)

Also worth noting the position of the arm/cables on the heater control valve (in the cold and hot positions) - to make it easier to set-up the new valve

1971 Alfa spider 1750............
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