Hey guys I have a 91 4dr lx, and I'm getting No HEAT. I get a tiny little little heat in position 1 when I put it to 2 3 and 4 it blows COLD air. I changed thermostat, upper rad hose, rad cap, and the heater control valve cable moves. I also checked if the hose behind the heater control valve gets hot or not. And it does, I also checked inside the blower motor and it's not clogged or anything. ANYBODY have any idea? I'M FREEEZZZZZINNGGG thank you!

 

replace your radiator cap also. hopefully thats your problem. Otherwise make sure the valve inside the engine bay is moving freely when you adjust your cold/hot dial. The valve is next to the firewall, you will see it.