Having a problem with blower motor. Happens in any mode, heating, cooling etc. Fan will not not run sometimes and will run ok other times. When it is not running, sometimes it will start while driving. Suspect relay, but don't know which one it is in the relay box on firewall. Would appreciate advice.
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Many of those type trucks have a fuel gauge issue...I don't think it is in relation to your heat and cool problem...I know people have had to change the complete fuel sending unit assembly to fix gauge...It wasn't cheap...Should have been a recall but it wasnt...However I don't have enough info for the heat/cool problem...Is the blower motor running all the time or does it not run until you drive for awhile..?..Some blower motors that go bad won't come on until they are jarred or tapped with a hammer...Maybe it is vibrated while driving and finally comes on...You have to listen closely to make sure if it comes on when you turn it on...If it always turns on when you flip the switch then it sounds that your HVAC blend vent doors are very slowly opening...This could mean the door actuators are wearing out or the plastic vent doors are contaminated at the hinge and slowly opening.......So check the blower motor operation first...If it don't blow until you drive the motor is going bad...First make sure all fuses have a good connection..sometimes they vibrate out...Also blower motor relays.If a blower motor relay is bad the blower will not come on at all....A faulty relay will not work the fan at all....If the blower motor comes on when it wants to it has to be a bad motor or improper connection....Sometimes a motor will operate but doesn't blow..This could mean the fan has torn loose from motor....Best way to troubleshoot blower motor is remove it,inspect fan connection...,hold it safely in your hand while an assistant turns it on.....Good luck..
Hope new bits were used not s/h. if new parts fitted check the multi plug fittings they have a habit of breaking wires in and around the plug a multi meter is helplul and a can of wurth sabesto 2040 penetrant spray a GOD send for all mechanics.
Might be the Resistor pack located close to the blower. It has a flat connector with 4 or 5 wires, and two small screws holding in the duct. It may be a crispy critter. It happens... The blower moves air across it to keep it cool. The blower motor may be bad as well, or possibly the fan speed switch. May very well be the fuse for the blower as well. The blower connector may be loose. Let me know what you find.
good possibility your radiator is partially obstructed either internally (calcification blocking core tubes) or externally (leaves etc either in front of a/c condenser or between condenser and radiator). When that happens,(internal) heat transfer is lessened and the fan will work overtime to keep the temperature down. Flushing will sometimes help, but chems used are milder than they used to be and often will go around internal obstructions instead of dissolving them.
its not in the headliner. its under the side panel in the rear on drivers side. you half to remove the panel on the inside just above the rear tire. since the moter runs sometime i would replace the blower motor resistor first cause these are known for going bad and its in the same area as the blower motor. this resistor controls the fan speeds and if its gone bad the fan dont run right. plus its alot cheaper than blower motor. once you have replaced the resistor you can turn the fan on and see if its a fixya before putting the panel back in place.