wthorne Posted December 24, 2011 Share Posted December 24, 2011 I have a 1990 300zx . The heat will not blow hot all get it cold air. I have flushed the cooling system and the heater core is not blocked or leaking i can feel heat under the dash. I checked the climate control fan in the roof and someone had stuck a piece of paper in it to stop it from spinning. I removed the paper but i think the fan is burned out it will not turn anymore. Will this prevent the heat from coming on? ? ? Thanks for any help its cold !!!! Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted December 24, 2011 Share Posted December 24, 2011 1st thing causing no heat is vacuum leaks most of the time. Check all vacuum lines going to heater / air con unit. Quote Link to comment Share on other sites More sharing options...
wthorne Posted December 24, 2011 Author Share Posted December 24, 2011 I have checked all the lines even all the ones behind the dash. That is why I was wondering about the Climate Sensor in The T Bar?? Thanks!! Quote Link to comment Share on other sites More sharing options...
Jehannum Posted December 26, 2011 Share Posted December 26, 2011 (edited) I have checked all the lines even all the ones behind the dash. That is why I was wondering about the Climate Sensor in The T Bar?? Thanks!! There's also a small pleated tube that takes in air from the driver's side dashboard. If that pulled off of its vent boss, you'll likely see a similar issue. edit: if you set the temp all the way to 90°F (the max setting), it should bypass temperature sensing altogether. What happens when you do that? If it gets warm, then you've got a sensor issue. If not, you've got a mechanical issue (mix door or vent door). Edited December 26, 2011 by Jehannum Quote Link to comment Share on other sites More sharing options...
wthorne Posted December 26, 2011 Author Share Posted December 26, 2011 That must be it then cause when I set it on 90 its still ice cold. How do i resolve this issue? Quote Link to comment Share on other sites More sharing options...
Jehannum Posted December 26, 2011 Share Posted December 26, 2011 I'd start troubleshooting here. It will involve ripping at least half your dash apart, though. Quote Link to comment Share on other sites More sharing options...
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