New Heater Valve Replacement Options???

plaaya69

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#1
I am thinking about getting a working r12 a/c system back in the Supra so I would like to retain a opening and closing heater valve. Currently I have a 90 degree brass sharkbite fitting that works good to keep the coolant flowing but does anyone have any aftermarket replacement options besides a used oem brittle plastic heater valve?

I might be looking into this metal one since it retains a vacuum port and seems to be the same 5/8" heater hose size:

FOUR SEASONS 74604-
https://www.rockauto.com/en/partsearch/?partnum=74604
 

plaaya69

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#4
I do like the oem design but in my 87 Supra that is the only time I was left stranded due to the brittle plastic all falling apart. I know as time goes on and mileage goes up it will just be a matter of time before a used one cracks again.

I have also been suggested this one from another Supra owner which comes from a late 90's Camry. They said you need to use the arm linkage from a Supra.

FOUR SEASONS 74850:
https://www.rockauto.com/en/partsearch/?partnum=74850
 

3p141592654

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#5
Last edited:
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plaaya69

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#6
The metal one you show I think has the polarity wrong on the vacuum actuation, but you can fix that by rerouting the hoses on the solenoid.

Jetjock cross referenced it to a late 90s Geo Prizm or 92-01 Corolla. Here is his post.

http://www.supramania.com/forum/threads/what-is-this.69435/post-987930

Here's one on ebay

https://www.ebay.com/itm/For-1992-2002-Toyota-Corolla-Heater-Valve-64978HH-1996-1997-1993-1994-1995-1998/392125763455?epid=20023824644&hash=item5b4c844f7f:g:OggAAOSwcTlbn5Md&fits=Year:2001|Model:Corolla|Make:Toyota
Interesting, thanks 3p.
 

hvyman

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#7
a lot of earlier toyota used them and have about the same routing. personally i just delete it.
 

plaaya69

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#8
a lot of earlier toyota used them and have about the same routing. personally i just delete it.
I currently have the whole heater valve deleted with a 90 degree brass fitting but now since I want to keep the a/c system in my new Supra I would like to have it working to keep the a/c system working at it's best. Do you use the a/c system a lot in your Supra or do you notice any a/c cooling performance issues with a continuous flow of coolant?
 

3p141592654

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#9
From jetjocks post referenced above...........

"As noted you could simply delete the valve altogether (connect the hoses) but doing so will cost you around 10 F in AC temps."
 
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hvyman

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#12
Maybe where your from. But when it’s 80-100f out even new Toyota’s it can be hard to reach that unless you run it for a long time. Although you can run into evaporator freezing. Usually I would see 45-50 more common.