I'm not sure your problem is a blown fuse. If the blower motor is running and pushing out air, then it's working normally. First check would be the thermostat, let the engine warm up and feel the radiator hoses. If 1 hose gets hot and the other is cold, most likely you have a bad thermostat. If thats ok, make sure you dont have any vacuum leaks, as most of the blend air doors that allow heat into the van are vacuum operated. It doesnt take much of a vacuum leak to lose your heat. Finally, make sure the control cables behind the head unit are in place and not kinked or broken.
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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This will help.Thanks.
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