A 1994 Ram does not have a passenger side airbag.
The ignition key should turn the disable switch.
You shouldn't remove the airbag and subsequently drive without a passenger side airbag. The only purpose to remove the air bag in that case is to kill the passenger. The alteration or removal of an airbag resulting in death is an act that will face criminal prosecution. My 2001 Dodge 3500 passenger side airbag can be disarmed with the key on the dash. No need to remove it.
Removal of the passenger airbag will not provide access to the heater core. The entire dash and HVAC housing need removed.
You can not, it is mandated by the US government.
It is illegal to disable an air bag without written permission from the NHTSA.
Under the drivers seat.
no the 96 steering wheel is different
There are pages of codes for the airbag system. You need to have it checked for codes by a qualified mechanic as airbag systems are not a do it yourself system.
Passenger side of the firewall.
underneath the passenger seat
Is it still under warranty? If not, then you need to go to a car parts store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
It is on the passenger side, rear of the engine.