ac/heater blower works some times and sometimes doesnt? - Dodge Cummins Diesel Forum
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Old 09-17-2012, 04:30 AM   #1 (permalink)
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ac/heater blower works some times and sometimes doesnt?

Just like the title says most of the time my blower doesn't work but when it does its blows properly on all setting from low to high where should I start looking at connection and or wires?
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Old 09-17-2012, 08:13 AM   #2 (permalink)
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you sure its actually not working? or is it going to defrost vents and you just cant feel it? if this is the case check your vacum pump for leaks and check your vac lines.
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Old 09-17-2012, 10:22 AM   #3 (permalink)
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Either a vacuum leak because of position problems or blower motor resistor because of speed issues.
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Old 09-17-2012, 03:48 PM   #4 (permalink)
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When it does work all the position work and the controls to go from defrost to foot and both upper and power from low to high also work fine so i guess i should should look at the resistor for the blower itself...?

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Old 01-19-2013, 09:29 AM   #5 (permalink)
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had the same problem, untill yesterday. when i sat in the truck and turned the key on to wait for my fuel prime my fan was blowing on the lowest setting, then when i cranked up the thing just stopped. now i cant get it to work at all so im going to replace the relay and resistor just because they are old, maybe the motor too but that thing was blowing strong as hell last time i took it out about a year ago. just moved to va from florida though, everything seems to be different with my truck up here in the cold. i got some of that sweet bright red spectre vacuum line i think it is, from summit. at like neg 10 deg its still flexible as all get out, so im still working getting all my lines replaced with this stuff. will update later
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