Heater fan resistor block
#12
now it works, when i got this truck i went through and replaced a few blown fuses not knowing what they were for, but after looking at the faq someone put a 5 amp fuse in when its needs to be a 30 for the heater fan. now the fan works but it only works on defrost. but its better than nothing.
#13
Join Date: Dec 2003
Location: Sycamore, Illinois (displaced to Arkansas)
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As far as the heater working only on defrost, that is either a vacuum problem (in the event of a loss of vacuum, it will default to defrost position for safety purposes [windshield will be able to stay clear]). Or, there is a fault in the mechanical, which is not allowing the doors to move, and therefor, not allowing air to flow thru the other vents.
#14
At first I was afraid that it wouldn't get enough air flow so I didn't put the grommet in but, it gets plenty with the grommet in.
#15
As far as the heater working only on defrost, that is either a vacuum problem (in the event of a loss of vacuum, it will default to defrost position for safety purposes [windshield will be able to stay clear]). Or, there is a fault in the mechanical, which is not allowing the doors to move, and therefor, not allowing air to flow thru the other vents.