Need Heat
#1
Driver
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Join Date: Sep 2005
Location: MISSISSIPPI
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Need Heat
Hey new issue. Its gettin cold here in Mississippi and for some reason my 91 is acting like it doesnt know what warm air is. It has completely expanded what it thinks hot air is. I try to wait until the car is warm but after like an hour of continuous driving only then will it try to get warm. What do I need to replace to fix this and can I do it myself. Let me know wassup guys.
#4
3UZ-FEEEE
iTrader: (2)
Not sure what your problem is then. having said that, IF its the same as teh SC400, there are two lines in the engine bay that you can swtich to regain back some heat.
Have a read here:
https://www.clublexus.com/forums/sho...ht=heater+line
https://www.clublexus.com/forums/sho...ht=heater+line
There are some pics to the lines you switch to cause the heater core to kick in, the reason for it not kicking in is usually a bad heater valve.
there are some thread with pics, but i cant seem to find them... have a further look in the SC forum.
Have a read here:
https://www.clublexus.com/forums/sho...ht=heater+line
https://www.clublexus.com/forums/sho...ht=heater+line
There are some pics to the lines you switch to cause the heater core to kick in, the reason for it not kicking in is usually a bad heater valve.
there are some thread with pics, but i cant seem to find them... have a further look in the SC forum.
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#8
LS400 does have the heater control valve but it doesnt work or look the same as SC400. It is located on passenger side firewall. Usually this valve will leak a little coolant (you will see flakey residue) and this coolant will run down the heater control cable and cause it to bind up. When it binds up it will not open air mix door inside vehicle. If you look under dash on passenger side above transmision tunnel you will see cable. Check cable movement as you raise and lower temperature setting on climate control panel.
Good luck
Good luck
#10
Yeah you found it. If you will notice, there is a cable connected to the valve that moves (or should move) as you adjust temperature up and down. All that reddish colored substance on the valve is coolant leaking and that coolant will run inside of the cable causing it to seize up. Seized cable means no heat.
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