there is an electrical panel box in the engine conpartment..take the cover off and read the inside cover and look for heater relay
look to the left of the battery for a cord
you have to remove the dashboard top. It is located in the right hand side of the dash. It is a little work but you can get it out.
Check the heater core if weather not responsible.
By asking acablest to do it.
Where is heater core located on 92 chev
you might need a heater core
The heater core is located underneath the dashboard on the passenger side and a lot of the dash components will have to be removed. This is a fairly complicated repair and I recommend getting a book so you know how to do it properly.
go to autozone and get a haynes repair manual,it will show you everything.
the heater core is behind the dash board
where the relay for rear blower in Nissan quest 1997
P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)