My heater blower randomly works and then doesn't work

Hi Abner Clicking noise, if it goes with speed of engine and wasn't there before the valve train was adjusted. Take it back to be rechecked. If the valve train was adjusted to try and get rid of the clicking sound and it hasn't worked. The only thing you can do is get someone with technical knowledge to have a look at it. Unfortunately noises are somewhat impossible to diagnose unless you are standing at the vehicle. ( check engine oil level).
Blower motor one of four things (1) Poor electrical connection ( loose or slightly burnt connection to motor remove connector and check). repair or replace as necessary. (2) Something stopping the fan from turning (if pollen filter fitted above motor remove and with a mirror and torch check down inside on top of fan. (3) if a heater rheostat/resister is fitted in the location of the heater box this maybe faulty however when these fault it normally allows the fan to only work when you switch fan to maximum speed. (4) the fan itself is faulty . replace fan/motor. Good luck

May be a worn out blower motor or burnt wire on resistor for blower motor

Try starting the truck so it makes the noise.
Then switch the air control to "fresh".
If noise stops, it is probably the motor that closes flap to recycle the cab air.
It would be found under the dash, under the glove box, & would need to be replaced.

Pull the heater control panel out of the dash and inspect the blower speed control switch, look for signs of a burnt connector to the switch, it will be discolored looking, if this is the case replace the switch and install a repair connector

remove you glove box you will see the blower rheostat mod.
replace that it will fix your truck #1

I would replace the blower motor resistor first then see if that corrects this. The resistor is located next to the blower motor under the dash.

The heater fan is on the right side floor board under the dash. It is a little tough to do but not extremely hard. If the blower was making noise, it could be something in the heater housing. If it is starting and stopping it is probably the blower motor. When replacing the blower motor you may have to remove the fan from the motor depending on where you buy a new one. The fans (usually made of plastic) break very easy. If you attempt this, be very careful in removing the fan.

Under the dash on the right side you will have to lay on the floor and look up. There may be a lower dash panel to remove. The motor is just below the glovebox. Removed the wire, remove the bolts/screws attaching the blower to the housing. Remove the blower.

your blower motor failed and you need to replace it

have you turned on the switch and checked for power at the blower plug? if so and you have power there then it is a blower motor if not then check fuse under dash and fusable link under hood around blower motor someplace close.

Replace your blower resistor located under the passenger side dash.