Replaced the AC / Heater switch. Fan works AC works but I am not getting enou heat out of the heater. In fact it blows cool air when driving and fan is on Hi. I replaced the thermostat but it didn't change anything. Is there a vacuum hose that goes to the switch that might be off? What else can I check?
Thanks
Dave
Heater core may be clogged. disconnect the hoses. CUT THEM OFF THE HEATER CORE!!!! If you pull them you may damage the solder joints at the tubes causing a leak. Them connect a garden hose and flush one way then another till water runs clear.
Okay, new thought, Often the blend air door is either stuck or the vacuum diaphram that operates it is defective. Also, the pushbutton selector could be bad. Try this, get a length of vacuum hose. Disconnect the vacuum from the blend air door vacuum diaphram. place one end of the vauum hose on the diaphram the other to a vacuum source. see if the diaphram moves or if you get the desired reaction form your heater. If you get heat, the selector is probably bad. if not, it's the diaphram.
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To troubleshoot this types of problem,click the link below
:----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the
issue.
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Engine Overheats and heater
blowing cold?
http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
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Heat blows cold on drivers
side and hot on passenger side?
http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html
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No heat on car?
http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html
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Heater blows intermittently and temp
gauge goes erratic?
http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html------------Heater blows cold?
http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html
---------Car heater blowing warm, but not
hot air?
http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html--------
Heater/AC blower motor not working?
http://technoanswers.blogspot.in/2012/02/heaterac-blower-motor-not-working-on.html
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A/C, heater, defroster fan, not
working?
http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html
Heater problem?
http://technoanswers.blogspot.in/2012/02/heater-problem-on-isuzu-trooper.html---------
This will help.Thanks.
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Flushed core and got good, clean flow. still no heat.
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