I have a ‘82 Nomad travel trailer. The last couple of times we were camping the furnace will stop blowing hot air. The fan will still be running just will not be blowing hot air. What I do to remedy...
You do have the thermostat's fan setting set to "automatic" and not on "manual", "low", "high", etc? You may have exceeded the high limit temp of the furnace if you have registers blocked, collapse of duct work, or any other thing blocking heated air exit flow. You may also have a failing high limit switch but most I've seen fail, fial open, so the furnace will not even operate. Good luck on the furnace fix!