The front blower should have a resister to change the speeds. It is usually mounted close to or on the back of the blower motor.
I'm having problems with the ac blower of my Tahoe in front.
If it has separate blower speed controls for the front and rear, it has separate resistors. Blower speed resistors are mounted close to the blower motor it controls for cooling purposes.
If you mean the fan works on high only it's the blower motor resistor.
I have a 98 with rear ac. I had to replace a blower $165 from a local mechanic.
The 2009 Chevrolet Tahoe has 65.3 in. of front shoulder room.
The 2006 Chevrolet Tahoe has 40.7 in. of front head room.
The 2005 Chevrolet Tahoe has 41.3 in. of front leg room.
The 2010 Chevrolet Tahoe has 65.3 in. of front shoulder room.
The 2003 Chevrolet Tahoe has 61.4 in. of front hip room.
The 2009 Chevrolet Tahoe has 41.3 in. of front leg room.
The 2004 Chevrolet Tahoe has 41.3 in. of front leg room.
The 2006 Chevrolet Tahoe has 65.2 in. of front shoulder room.