Why do i blow fuses when i turn on blower - 1996 Dodge Dakota

What make , model an year vehicle ? Probably not a fuse issue , fuse's don't blow for no reason . A short to ground in the electrical circuit is what causes fuse's to blow . Also a lot of vehicle's with electronic climate control use a blower motor control module . The way to find the problem would be to look at wiring diagrams to see what all is involved it turning on the blower motor . Then using a DMM - digital multi-meter to test the electrical circuit .

Not sure which fan you mean. Engine cooling fan is different from heat/air blower fan.

The resistor is not the likely candidate for a fuse problem. There is either a short in the electrical wiring to the blower motor, or the blower motor itself is faulty, causing the fuse to blow. Disconnect the blower motor from the circuit and try turning it on. If the fuse doesn't blow, it's probably the motor.

You may have a bad resistor or blower motor, a quick test would be to remove the connector from the blower and then turn key on and turn controls to all blower speeds and if the fuse blows then resistor is bad, if the fuse does not blow then reconnect the blower and try the settings again and if fuse blow then blower is bad. good day

if it blows air only on forth speed then the blower motor resistor is faulty

By A/C blower you mean the A/C fan by the radiator? it is possible that the fan motor has failed therefore requiring more amperage to try to turn it and as a result it blows the fuse. Disconnect the fan and install good fuse and turn A/C on if the fuse does not blow replace the fan.

Both are possible.But it can be blower motor issue mostly.Its taking too load and that's blowing the fuse.How to Test and Replace Blower motor on car? http://repairhelpcenter.blogspot.com/2011/12/how-to-test-and-replace-blower-motor-on.html--------- How to Replace Blower Motor Wheel? http://repairhelpcenter.blogspot.com/2011/12/how-to-replace-blower-motor-wheel.html
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Also more help solutions recommended. Click the link below :---
Blower motor replacing for all vehicles? http://repairhelpcenter.blogspot.in/2012/02/blower-motor-replacing-for-all-vehicles.html
----------Blower motor Resistor shorting problem? http://schematicsdiagram.blogspot.com/2011/12/blower-motor-resistor-shorting-problem.html
--------This will help.Thanks.

The purpose of a fuse is to protect the wiring in a circuit. If it blows it is because of an overload which would occur if the blower motor is siezed or there is a short in the wiring. My first instinct is a problem with the blower motor. Try isolate the blower - disconnect the leads to the motor - and try switch it on. If the fuse blows again the problem would then be a shorted wire.

fuse blows. unplug heater blower motor turn ignition on, turn heater on, does fuse blow? if not need to replace heater blower motor

Sounds like a seized up (bad bearings) blower motor. It may not pull enough current to blow the fuse at the lower fan settings but does at the high one. Something could also be jamming the blower fan in its air duct.

Most blower motors can be accessed under the hood. Replace the fuse then put the blower switch on one of the lower settings (don't blow the fuse). Get yourself a good sized screwdriver and hit the back of the blower motor with the screwdriver handle a couple of times.

Sometimes (unless the blower motor has totally seized up) you can get it to spin and this will tell you for sure you need a new blower. Other than that, you can get a spare blower motor, remove the connection wires from the old motor and hook them up to the new one to test before you go to the trouble of replacing the blower.

Hope this helps you out... -Dan