Another O. L. T. DIY - In depth with the heater core control valve
#91
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Join Date: May 2008
Location: ny
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92-2000 SC heater control valve
Hello all and thanks for all the info on the valve.I have solved the heater valve issue. (aftermarket product) What we need for our SC`s is a vacuum controlled,normally closed,vacuum opens 5/8 hose valve.What worked for me was a ford et4z18495a witch also is motor-craft yg256/yg264.(found on eBay for $23) What will also work is four seasons 74604 & 74614.I tried the four seasons 74858 witch is the same as the motor-craft yg368 with the doorman 47062 5/8 elbow.That valve is opposite, its open normally and closes by vacuum.Heat in summer so you have to plug the vacuum line in summer and reconnect in winter.(I live in NYC.) I Just left the old bracket on with the plug connected and all is well.I took off the old vacuum diaphragm also.I had to use the 5/8 elbow too. You also will have to buy a smaller vacuum line for the valve the stock Lexus was a little to big and couldn't create enough vacuum.I am going to try and attach a picture.My car is a 93 SC300.Original family owned.
#92
Pit Crew
Would seem that Murray 74850 from O'reilly's works. It looks practically identical to the old four seasons valves so it might just be the same exact thing with a different part number. Apparently it's for corollas. Requires shaving off a bit of excess plastic and reusing existing actuator arm but it spins in the correct direction and is only 60 bucks. Can do a writeup if anyone's interested.
#93
Driver School Candidate
What seems to be missing in this discussion is the diameter of the inlet/outlet tubes.
It seems the OEM diameter is 5/8 inches, whereas the 74850 has a diameter of 3/4.
It seems the OEM diameter is 5/8 inches, whereas the 74850 has a diameter of 3/4.
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KahnBB6 (02-27-24)
#94
Pit Crew
Sounds about right. The hose fit on the valve with some wiggling and forcing. it took some silicone lubricant and a bigger clamp, but hey, it works.
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