alicias Posted November 27, 2005 Share Posted November 27, 2005 my heater is blowing cool air. it sounds like the thermostat is stuck open and needs to be replaced. at least that's what i'm hoping since that's relatively cheap to fix. where is the thermostat located? Some postings say its easy to find some say it'll take 3 hours to change. if its not the thermostat, i'm going to check the heater control valve ... does anyone have any pictures of the thermotat location and/or heater control valve? Quote Link to comment Share on other sites More sharing options...
monarch Posted November 27, 2005 Share Posted November 27, 2005 LS400 thermostat replacement tutorial http://www.lexls.com/tutorials/cooling/thermostat.html SC400 has same engine and thermostat Quote Link to comment Share on other sites More sharing options...
alicias Posted November 29, 2005 Author Share Posted November 29, 2005 Thanks! That's exactly what I was looking for. Quote Link to comment Share on other sites More sharing options...
chasrb Posted December 1, 2005 Share Posted December 1, 2005 I have an SC400 1994 and there is no heat blowing out. The AC runs fine. My temp gauge works so the thermostat must be working (i guess) so the next step is the Heater cotrol valve? I have done the tube bypass and the vac actuates, but no fan blowing out heat. Can a LS400 HCV be used instead? It's only 82 USD vs 315 USD. Thanks Quote Link to comment Share on other sites More sharing options...
ZINFANDEL22 Posted December 1, 2005 Share Posted December 1, 2005 I have an SC400 1994 and there is no heat blowing out. The AC runs fine. My temp gauge works so the thermostat must be working (i guess) so the next step is the Heater cotrol valve? I have done the tube bypass and the vac actuates, but no fan blowing out heat. Can a LS400 HCV be used instead? It's only 82 USD vs 315 USD.Thanks ← Hope its not the blend door ,I am having mine fixed in my cherokee today. A five our job at 90.00 an hour sucks and thats just labor.I have split system and just passengers side blows cold air. Quote Link to comment Share on other sites More sharing options...
CLightning Posted December 2, 2005 Share Posted December 2, 2005 Anyone have any how-to's or pics to check the heater control valve? Thanks in advance. Quote Link to comment Share on other sites More sharing options...
alicias Posted December 5, 2005 Author Share Posted December 5, 2005 my thermostat wasn't the problem. i put in a new one. it was really easy. still no heat. my next step is having some look at the heater control valve. at least the seat heaters work. Quote Link to comment Share on other sites More sharing options...
alicias Posted December 15, 2005 Author Share Posted December 15, 2005 i wound up getting a new heater control valve. it was $385 + tax installed at warnock lexus in livingston, nj. a really good dealer if you need one near NYC. Quote Link to comment Share on other sites More sharing options...
monarch Posted December 15, 2005 Share Posted December 15, 2005 Do you know brand or color of antifreeze had been in the cooling system prior to heater control valve failure? Quote Link to comment Share on other sites More sharing options...
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