philsmith1a Posted July 7, 2010 Share Posted July 7, 2010 Can anyone give me a list of how and what to check to diagnose why there is no heat coming through the interior vents. I currently have the dash off doing interior work so I was going to change the matrix anyway-is there any way of checking the matrix's condition? Link to comment Share on other sites More sharing options...
2soops Posted July 7, 2010 Share Posted July 7, 2010 Sounds like an airlock, or selector not moving to hot setting. I used to get similar on mine till i bled the radiator Link to comment Share on other sites More sharing options...
nasoup Posted July 7, 2010 Share Posted July 7, 2010 this is going to sound sarcastic but its not! Is the engines coolant level correct? Is the cars engine up to temperature when trying the heater? Link to comment Share on other sites More sharing options...
philsmith1a Posted July 7, 2010 Author Share Posted July 7, 2010 Coolant level is fine and yes i have tried it when the engine is at running temp. i will flush, refill and bleed the system 1st. As the dash is off i have been advised to change the matrix anyway but i am just a bit reluctant if there is nothing wrong with it, i wonder if there is any way of checking how old and what condition it is in. Link to comment Share on other sites More sharing options...
creative Posted July 9, 2010 Share Posted July 9, 2010 change it anyway... If its the original, it will go at somepoint and you may as well do it now whilst it is in bits! Link to comment Share on other sites More sharing options...
AlanM Posted July 9, 2010 Share Posted July 9, 2010 (edited) change it anyway... If its the original, it will go at somepoint and you may as well do it now whilst it is in bits! agree, too much hassle to take the dash off twice http://www.demisterman.co.uk/Toyota/Toyota%20Supra%20Mk4%201993-98%20heater%20matrix.php £62 ain't bad Edited July 9, 2010 by AlanM (see edit history) Link to comment Share on other sites More sharing options...
Dnk Posted July 9, 2010 Share Posted July 9, 2010 This may sound a bit bonkers but if the dash is off how are you controlling the temp setting, have you plugged parts of the dash back in ? Link to comment Share on other sites More sharing options...
philsmith1a Posted July 9, 2010 Author Share Posted July 9, 2010 Im not, Im talking about when the heater controls were in place. yeah, cheers for the link i'll get one ordered. Link to comment Share on other sites More sharing options...
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