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most likely the resister. Not very expensive part and should be easy to change out if you know where its located ( usually under the dash) You can buy a repair manual for your model at any parts store, and be sure to ask the parts guy if he knows where its located. he might just be able to save you the cost of the manual. Good luck with it.
You cannot lube the motor as it is sealed for life. The reason it only works on high is either that the motor is defective or the blower motor resistor pack is defective. As the motor is squealing, which is an indication that the bearings are failing, I would recommend you replace the blower motor and see if it still only runs on high. If so, then replace the resistor pack.
If the blower is making noise than the only thing you can do is replace it.
Blower resistors typically operate by dropping voltage through a set of resistors. The lower the speed the more resistance is needed. High speed requires no resistance and usually bypasses the resistor assembly.
take out the glove box then on your right side you will see the blower motor housing. it has 3 chrome bolts unscrew those sometimes things get in there-the other day my blower motor was vibrating there was a napkin in there-any questions email me and i will give you my cell so we can talk if any questions thanks brad
On my '95 Trans Sport (I don;t think theere's any difference - under the hood - look about the middle of the firewall near the top. You'll see the motor & outer housing. There are 4 screws in the housing, but don't know if disconnecting & removing the screws will allow you withdraw the blower assy on the engine side of the firewall.
For me, I checked there was volts at the blower electrical connector.
There was, so I took a soft hammer and whacked the motor casing a few times. It started to turn, but with a squeel. So I whacked it more, the squeel lessened & the motor speeded up. So I just continued whacking from different directions until I seemed to have aligned things - max speed, no squeel. Seems to be working 100% now (for the time being).
If no volts at the motor connector, try whacking the blower relay at the upper portion of the firewall about a foot to the left of the blower. This worked as a temporary fix on my old '91 APV. Eventually it failed for good. The new relay fried in short order. Had to put in a higher Amps one. Also check the relay connector, mine was corroded out and had to be replaced as well.