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Just curious, but does your blower fan work ok with just the heater is on? The only reason I bring this up is becuz my blower is about to go south, and when it's on high, it pulls my battery down.

 

whenever I turn blower on any setting it will drain battery when the van is 2warming up, once it's warmed up it works okay except when I come to a stop and blower is on high it will strain battery. I unplugged my compressor so I can use defrost setting in the morning but once summer gets here i'm gonna have to put it in the shop, I live in florida, you have to read all my earlier posts to see my exact problem. i'm tempted to put a new battery in to see if that helps but it starts right up all the time. battery and alt. tested good except when compressor kicked on then alt. dives and 10 seconds later it blows the 20amp starter/ac fuse under the hood