I need to replace the blower motor on my 1994 GMC Suburban, it squeels at different speeds. I started to do it today but the cover over the unit looks like it may be the toughest part of the removal so the motor can be exposed-please help.

Here are some possible solutions. http://repairpal.com/ac-blower-inop-due-to-failed-resistor-447 Blower Motor resistor replacement Silverado Sierra Tahoe Yukon Suburban...

could be the blower motor or a bad connection in the wiring

The blower motor is under the dash on the passenger side.
Could be a faulty blower resistor too.

If it does not work on any speed then I would expect a bad blower motor. With the key on and the blower speed set to high try tapping on it. If it starts to work it needs to be replaced. If it still will not work than you will need to see if there is power and ground at the blower motor.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

sounds like the blower resistor is bad. the following link has a video on how to replace it

http://www.youtube.com/watch?v=O7DqaqHTCzw

The only way to know for sure is to pull the blower motor and check the fan alignment and bearing - the fan may be hitting the case on each revolution at low speed. When you do, you will probably find a lot of debris in the cavity, especially up against the heater core (be VERY careful if there is some and you try to remove it).

if the motor hasnt been running for a long time it will squeel. my father has a k1500 truck the same year and to change the motor you need to remove the glove box

Under dash, passenger side, sit next to the blower motor, on the housing.

Replace the blower blend door actuator https://www.partshighway.com/product.php?productid=104135&cat=0&page=1&basevehicleid=&legacyvehicleid=&catid=&partterminologyid=&partnum=RNB-604-103

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.