The switch on the dashboard for the defroster and a/c won't work. Flip it on and nothing. I tried to replace the fuse (#26, 30 amps, lt green) and it's blows everytime I turn the van on and try the defroster. Help! Thanks.
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the heater blower uses allot of amps and often burns up the on and off switch. I have had the same issue with 2 other cars. also.. check your fuses.. sometimes thats the only problem.. the heater blower has a fuse for itself. fuse boxes are sometimes in more than one place on your car. look under your dashboard and under the hood.
make sure the dimmer switch is not in the off position as this sometimes happens without knowing it.next check the fuses with a test light but you will have to turn the systems on,tailights,blower motor,etc as some fuses won`t activate without the circuit turned on.the amp rating of the fuse will be marked on it.
The blower fan is powered by a 30 amp circuit breaker.Its in the box at the pass kick panel. Is it getting power through it? The blower relay is powered through the GAUGE fuse 7.5 amp. Check ALL the fuses. There is a 30 amp fuse that powers the ign switch also. If you get the blower working I think everything else will work.
Check the blower motor which is behind the right side of the dash, in the lower right side of the HVAC Assembly, above foot area of the passenger floor. The other thing to test is the blower motor resistor which should be next to the blower motor.
for the defroster only problem, check your vacuum lines. There are even lines under the dash. The switch the controls all that is run on a vacuum. It sounds like you have a head gasket leak. If the leak is big enough, you will lose vacuum pressure. The blower defaults to defrost vents when the vacuum is not strong enough. I had a leak in a vacuum line, causing the blower to switch to defrost, no matter what it was set to.