frblexus Posted December 12, 2007 Share Posted December 12, 2007 I have a 1993 SC400. My heater will blow but not warm air. Is there a heat control valve that I can check/replace or should I be looking for trouble someplace else ?????? Is it controlled by a fuse or what ?? Quote Link to comment Share on other sites More sharing options...
UCF3 Posted December 12, 2007 Share Posted December 12, 2007 I have a 1993 SC400. My heater will blow but not warm air. Is there a heat control valve that I can check/replace or should I be looking for trouble someplace else ?????? Is it controlled by a fuse or what ?? Are you getting Hot air when your in Motion? There is a heater duct valve that's controlled by your Climate Control. Look for something on the Pass-side midrange engine bay for that. You should be able to manually open the cover. Quote Link to comment Share on other sites More sharing options...
SeanGrac Posted December 13, 2007 Share Posted December 13, 2007 I have a 1993 SC400. My heater will blow but not warm air. Is there a heat control valve that I can check/replace or should I be looking for trouble someplace else ?????? Is it controlled by a fuse or what ?? Change your thermostat Quote Link to comment Share on other sites More sharing options...
frblexus Posted December 22, 2007 Author Share Posted December 22, 2007 I have a 1993 SC400. My heater will blow but not warm air. Is there a heat control valve that I can check/replace or should I be looking for trouble someplace else ?????? Is it controlled by a fuse or what ?? Are you getting Hot air when your in Motion? There is a heater duct valve that's controlled by your Climate Control. Look for something on the Pass-side midrange engine bay for that. You should be able to manually open the cover. No, I don't get hot air when in motion. I changed the thermostat like SeanGrac said. It made no difference. I am now looking for the heater valve, with no success. Is it on the firewall section (passenger side) or on the fender weld (passenger side) ????? I've checked all fuses and they look good. Still stuck !!!!!! Thanks Quote Link to comment Share on other sites More sharing options...
SeanGrac Posted December 23, 2007 Share Posted December 23, 2007 I have a 1993 SC400. My heater will blow but not warm air. Is there a heat control valve that I can check/replace or should I be looking for trouble someplace else ?????? Is it controlled by a fuse or what ?? Try the self diagnostic for the a/c. I can't remember the buttons that you have to push; but they are on the ac control panel. Its like the "recirc" and off buttons at the same time. Anyway, my local library has 'Mitchell's' online. Try yours. If it's not free; it's cheap. P.S. I am assuming that you have plenty of coolant in. If the comes on it needs more. Quote Link to comment Share on other sites More sharing options...
aliga Posted December 25, 2007 Share Posted December 25, 2007 I have a 1993 SC400. My heater will blow but not warm air. Is there a heat control valve that I can check/replace or should I be looking for trouble someplace else ?????? Is it controlled by a fuse or what ?? Are you getting Hot air when your in Motion? There is a heater duct valve that's controlled by your Climate Control. Look for something on the Pass-side midrange engine bay for that. You should be able to manually open the cover. No, I don't get hot air when in motion. I changed the thermostat like SeanGrac said. It made no difference. I am now looking for the heater valve, with no success. Is it on the firewall section (passenger side) or on the fender weld (passenger side) ????? I've checked all fuses and they look good. Still stuck !!!!!! Thanks i have one for sale 40 shipped to your door. paypal is gazi_ali@hotmail.com Quote Link to comment Share on other sites More sharing options...
KLEX Posted December 26, 2007 Share Posted December 26, 2007 I have a 1993 SC400. My heater will blow but not warm air. Is there a heat control valve that I can check/replace or should I be looking for trouble someplace else ?????? Is it controlled by a fuse or what ?? Are you getting Hot air when your in Motion? There is a heater duct valve that's controlled by your Climate Control. Look for something on the Pass-side midrange engine bay for that. You should be able to manually open the cover. No, I don't get hot air when in motion. I changed the thermostat like SeanGrac said. It made no difference. I am now looking for the heater valve, with no success. Is it on the firewall section (passenger side) or on the fender weld (passenger side) ????? I've checked all fuses and they look good. Still stuck !!!!!! Thanks i have one for sale 40 shipped to your door. paypal is gazi_ali@hotmail.com HAS ANY been able to resolve this heater issue, I have the same problem but dealer price was too much, and they did not show me the location. Who can assist me with this and who has had the problem fixed Quote Link to comment Share on other sites More sharing options...
option00002 Posted December 27, 2007 Share Posted December 27, 2007 It was mentioned above, but anyone suffering from a lack of heat make certain your coolant is topped off. When my level dips by even an inch heat is virtually unavailable. Quote Link to comment Share on other sites More sharing options...
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