Is it blowing cold air only or not blowing any air at all.
Need to know if the blower is working or not and if the air coming out is hot, warm or cold.
Check the engine thermostat. Its probably stuck open.
Heater Airbound? Heater control cable not working? Heater core plugged?
My 2001 Chevy Blazer was blowing cold air when I had the heat on. My husband flushed the line to the heater core and a bunch of junk came out and now my heat works great. My 2001 Chevy Blazer was blowing cold air when I had the heat on. My husband flushed the line to the heater core and a bunch of junk came out and now my heat works great.
The temp blend door actuator is probably at fault.
A bad engine temp sensor can do that.
Check the 96 Blazer for any vacuum leaks in the system. A vacuum leak can cause the air flow to only come out of the heat vent.
It is located under the AC and Heat instrument panel
check coolant level may be low or thermostat may be faulty
I would use a 5 minute Epoxy. Clean and heat both surfaces first. (hair dryer)
A blown fuse is the most common cause for the 1996 Chevrolet Blazer sheet and air conditioning not working. The fuse box can be found in the engine compartment.
Drain the blazer radiator. Refill with water. Open the heat on high, start the engine for a few minutes. Drain the system again Repeat this several times to get all of the old coolant out.