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I would turn the fan on with the van off and listen to see if just the blower is working at all or a slower speed. . If you have a volt meter you could make sure it was getting power by unplugging the wire to it and testing there.. If you have power then the blower motor is the problem . If it was a resister it would not work at all normally. or it would work on one speed but not another speed in most cases.. I would think by the age of it more likely a bad blower fan motor .the part is about 73 dollars to replace complete with fan and the resisters are 15-20 at your local auto parts store .
This could also be a wire harness issue with the resister plug which supplies the power to the blower . it very common that the wires got hot and melted from old age or from a blower that was old and drawing too much power .The resister and harness or located under the hood on the firewall of the passenger side of the van .Yes there is a fuse for the blower fan under the dash .If it has blown it could be the blower drawing too much power.or other issues .
Yes we sure do feel the heat here in Florida .
if it is not blowing any air what-so-ever your lookin at a blower motor. but there are some things to check first like the power goin to the blower motor resister and comin out to the blower. if theres power to the bower motor thats what u you need replaced. if not then its the resister. all of these items are easily fixed at your local mechanic shop. or u can find those items under the glove box. all you need to know is how to figure out how to get it out then its very easy.
Listen and see if the fan is still blowing. Check it on all speeds. If it is working, that probably is not the problem. Check and see if the fan quits blowing or if it just diverts to the defroster. If it does this, there is probably a vacuum leak somwhere in the lines or in the valves that open and close different doors. If the fan actually quits blowing, I would check the connector at the fan motor. unpug it and look for burned wires or connectors. If this is the case, you will need to get a new connector and make sure it plugs on tight. By the way, the fan is located behind the glove compartment.