spencerfunk Posted July 6, 2008 Share Posted July 6, 2008 My 1992 SC 300 was working fine till a couple of weeks ago. The heat stopped working. The A/C works fine. The same problem where my heat stopped working, but my A/C was working happened for a day back in January, but the problem went away. Now I have the problem and it hasn't gone away for a couple of weeks. Does anyone know what my problem is? Spenstar Quote Link to comment Share on other sites More sharing options...
sjc6765 Posted July 7, 2008 Share Posted July 7, 2008 usually the vacuum switching valve located on the firewall, passenger side. follow the hot water line, you will see a valve that is vacuum opperated, but controled by an electric solenoid. usually that solenoid goes bad. Quote Link to comment Share on other sites More sharing options...
spencerfunk Posted July 7, 2008 Author Share Posted July 7, 2008 usually the vacuum switching valve located on the firewall, passenger side. follow the hot water line, you will see a valve that is vacuum opperated, but controled by an electric solenoid. usually that solenoid goes bad. does anyone know how much that usually costs? also, is that something fairly easy to do myself? Quote Link to comment Share on other sites More sharing options...
sjc6765 Posted July 7, 2008 Share Posted July 7, 2008 There are a couple listed on ebay right now for 100.00. Easy 1 hour change. Quote Link to comment Share on other sites More sharing options...
UCF3 Posted July 8, 2008 Share Posted July 8, 2008 You might need to be patient when you replace the vacuum cable. Quote Link to comment Share on other sites More sharing options...
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