Heater fan comes on intermitently (often after hitting a bump) and when it doesn't work niether does the rear defrost, could it be a loose wire or some sort of sensor?

Due to the age of your vehicle, the brushes in the fan motor are worn out. you will have to replace the fan motor, it is not serviceable.

It sounds to me like you have a loose wire somewhere. A loose wire explains why it sometimes works and sometimes doesn't. It could easily come loose when hitting bumps and go back in place when hitting bumps as well. Another thing a loose wire could do is cause a short... It depends what the problem is exactly... Does it work sometimes and not work sometimes as soon as the car is turned on? Meaning, if it's not working when you start the truck, it won't the entire ride. Or, is it working on and off throughout one full ride? This should help more with determining what the problem is exactly.

If the light will come on and go off while you're driving, it's going to be a loose wire. The wire could be bumped in and out of place while driving, which is why it works and stops working while driving. It could also be a worn wire that's being bumped together and apart, causing the same problem. So check the wires going to the headlight set up.

If the light works sometimes when you start your truck and sometimes doesn't, but doesn't change while driving, it could be a short. It could also be a short if your light it working when you start driving, but eventually turns off while driving, but never goes from OFF to ON. This is because if there's a short, you would have to turn the truck off and then back on for the light to possibly work again. With a short, the light will NOT come back on while driving if it was not working when you started your truck. If it's a short, you're going to have to figure out what's causing it. They have tools you can buy for that. There are basic ones for roughly $25-$30, but I believe those only test one wire at a time. While there are other ones which can easily run $150 and more, and those test all the electrical at once and tell you where the problem is.

Your best bet is to check the wiring involved with the head light set up. If you notice any loose wires or old wires that are starting to corrode or crack, replace them and that should do the trick! If you don't notice anything, you could purchase one of those tools and test for a short. Or, what I recommend instead of buying the tool is take your truck to your local auto parts store (AutoZone, Pep Boys, Etc) and tell them what's going on, and ask them if they could test the truck for a short. Then, if you don't want them to fix it, just tell them you needed a quote and you'll come back when you have money... and then just do it yourself. Or, you could have them do it if that's what you prefer...

Good Luck and I hope I helped!!

Brendon

That is the wire you need, it should plug onto a pin on the window

It is doubtful you can repair this yourself so I suggest you take it to a Subaru car repairer.

Get someone with electrical knowledge and a tester to check the supply etc to the fan. Also the switch if the rear is separate.

Sounds like a faulty blend door actuator. This part diverts air from the different ports ie floor, vents, defrost. If it keeps changing when you hit a bump, either the actuator has a loose connection or it's bad all together.

Check the connections at the blower motor for loose or melted connections on the plugs and check the blower resistor for the same conditions....hope you find it good luck

This sounds like a loose connection to the motor itself. My truck has been doing that lately and I finally figured out the problem only when I starting digging under the dash while the heater was going.

When you turn left or right, the steering column must be tugging on the wiring, and when you hit a bump it's just enough to jar the connection loose. Check where the plug goes directly into the motor...most likely it's under the dash on the passenger side, or on the firewall on the same side, but in the engine compartment. It could also be that your steering column has worn the coating off of the wire and it is shorting out every once in awhile when the exposed wire hits metal.

probably loose connector plug or the heater fan motor has packed up alltogether

Check to see if any of the wire connections are loose.

Neil