Draining coolant from heater core - Alfa Romeo Bulletin Board & Forums
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post #1 of 12 (permalink) Old 06-09-2019, 10:26 AM Thread Starter
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Draining coolant from heater core

Whatís the best, least messy way to do this? Itís all still in the car, but I pulled the dash and center console. I need to remove the heater valve just to get to the 2 nuts on the d/s, but am leery of doing so b/c of all the coolant draining out. If I have the valve in the Ďoffí position, no coolant should drain from the intake side, but thereís still coolant in the core, plus, i assume, coolant could also come in from the discharge side?

Seems like the most sure way would be to drain all coolant and go from there? Looking forward to the collective wisdom. Thanks.

Jonathan
1974 GTV 2000 (ex-1992 Spider Veloce)
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post #2 of 12 (permalink) Old 06-09-2019, 11:07 AM
But Mad North-Northwest
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Only way I know of to not make a mess is to drain all the coolant. Then you can use low pressure compressed air on the driver’s side heater hose to blow any remaining coolant out of the core.
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post #3 of 12 (permalink) Old 06-09-2019, 01:27 PM
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Uh... Iíve never had to remove mine, but it seems simple enough to just pinch the hoses or find a suitable size plug for the hoses or heater core nozzles.

Ken
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post #4 of 12 (permalink) Old 06-09-2019, 01:44 PM Thread Starter
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Originally Posted by Gubi View Post
Only way I know of to not make a mess is to drain all the coolant. Then you can use low pressure compressed air on the driverís side heater hose to blow any remaining coolant out of the core.
Tanks @Gubi, was afraid of that...

Jonathan
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post #5 of 12 (permalink) Old 06-09-2019, 01:50 PM Thread Starter
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Uh... Iíve never had to remove mine, but it seems simple enough to just pinch the hoses or find a suitable size plug for the hoses or heater core nozzles.
Thanks Ken, I like the idea of the plugs. Iíll check Home Depot plumbing aisle. Iím only doing it b/c I noticed the other day that the p/s vent flap doesnít workóair comes out on the floor, but no matter how I adjust it it doesnít come out of the dash vent. So I only have 50% defrost. Plus the heat smells funky, so thereís something in there, so....... You know me, canít leave well enough alone.

Jonathan
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post #6 of 12 (permalink) Old 06-09-2019, 01:59 PM
But Mad North-Northwest
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Uh... Iíve never had to remove mine, but it seems simple enough to just pinch the hoses or find a suitable size plug for the hoses or heater core nozzles.
He's trying to remove the heater valve. When you do that (or even if you just disconnect the hoses at the core, pinched or no) all the coolant in the core will make a mess.

I mean, you can try to catch it in a cup or something, but easiest to just drain the system and get as much coolant out before you start.
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post #7 of 12 (permalink) Old 06-09-2019, 02:12 PM
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Uh... I’ve never had to remove mine, but it seems simple enough to just pinch the hoses or find a suitable size plug for the hoses or heater core nozzles.
Thanks Ken, I like the idea of the plugs. I’ll check Home Depot plumbing aisle. I’m only doing it b/c I noticed the other day that the p/s vent flap doesn’t work—air comes out on the floor, but no matter how I adjust it it doesn’t come out of the dash vent. So I only have 50% defrost. Plus the heat smells funky, so there’s something in there, so....... You know me, can’t leave well enough alone.
Blocked vent + funky smell = dead critter...

Sounds like you're going to need to pull the heater to fix that. With the dash and center console out, you're 4 nuts and two hoses away. Then you can do a thorough cleaning.
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post #8 of 12 (permalink) Old 06-09-2019, 02:51 PM
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Gubi and Gproket have given you good advice, this is a case of while your in there . I mean you have the dash out so it is very easy to pull the assembly, there are foam gaskets that will be crumbling for one thing. I know this because I have just rebuilt one for my Berlina resto. Hope this helps. Regards John
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post #9 of 12 (permalink) Old 06-09-2019, 04:08 PM Thread Starter
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Blocked vent + funky smell = dead critter...

Sounds like you're going to need to pull the heater to fix that. With the dash and center console out, you're 4 nuts and two hoses away. Then you can do a thorough cleaning.
Thanks Brian, dead critter EXACTLY. And I can pull the dash and console in about 35 min! The wiring diagram makes it super easy to put it back.

Jonathan
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post #10 of 12 (permalink) Old 06-10-2019, 07:27 AM Thread Starter
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Anybody know roughly how much coolant the core holds? Thanks.

Jonathan
1974 GTV 2000 (ex-1992 Spider Veloce)
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post #11 of 12 (permalink) Old 06-10-2019, 06:02 PM
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You know me, canít leave well enough alone.
Winter rains are over... summer is here... button her up and start driving! One Lap Marin is this weekend.

Ken
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post #12 of 12 (permalink) Old 06-11-2019, 12:25 PM Thread Starter
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Winter rains are over... summer is here... button her up and start driving! One Lap Marin is this weekend.
Doh!!! Gotta get on that!!

Jonathan
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