Hi, Sounds as if the motor bearing could be gone. The heater fan is behind the glove compartment. When you open the glove compartment, you'll see the two compartment stops on either side of the box, simply press these in and the box will drop down. Should you want to remove the box, simply remove the two screws and remove the box. There's no alignment issue as the tabs where the screws go through have a small nub that fits into a hole. The fan is more accessable with the door removed. The fan resistor is right there too. That's usually the culprit when you lose some of the fan speeds, usually the top two or the bottom two. Good luck. Steve
The 1997 Geo Tracker block heater does have a frost plug. The Frost plug will be a few inches below the block heater.
This can result from heater core blockage. If it is partialy blocked, you may notice a little heat with the fan on low, but it goes cool when the fan speed is increased. Other signs of blockage may include engine temperature fluctuation, and/or excessive pinging (pre-ignition). This can also be caused by the engine thermostat being stuck in the open position. Cracked heater core.
you must remove the dash it's in the heater box
Hose blockage, core blockage, disconnected heat valve.
When you have the heater on, does it just blow any air at all? or no air?
it should be below the radio in the heater box . must remove entire dash
no year? wow top of heater box. on 96 , remove glove box door.
AC and heater are 2 different systems. The heater works by channeling fluid from your radiator to a heater core usually located under your dash. Heater may not work due to blockage in the line from the radiator or the heater core under your dash may be faulty.
Low coolant, bad coolant, blockage in the coolant line, bad heater core or element, bad thermostat
bad heater core, heater hose blockage, low coolant, bad heater valve, bad control head. With my car, it was Heater matrix clogged with radiator sealant. The workshop cleaned it and it's start working fine!
The heater fuse for a 1993 Geo Tracker is located in the fuse box that is inside the engine compartment on top of the battery. It would also be a good idea to check the wires on the heater relay that is on the passenger side of the engine compartment on the fender wall. It is just behind the washer fluid receptacle.
The heater hoses on a 305 engine run from the intake manifold to the heater core and the heater core to the radiator. This creates a constant source of heat to supply the heater.