My truck doesnt heat up. The temp guage will get just a little above the C and it stops there, even in the summer. Last night I was out running around for 4 hours with very little stops and the interior never warmed up either.
Think I should start with the thermostat or could there be another problem. The previous owner had the radiator replaced in Jan 05.
After its been running for about 30 mins or so turn off the engine and feel along the upper and lower Rad hoses, the Rad top and bottom, and heater core hoses. If there all about the same temp (warm but not hot) to touch then I would suspect the thermostat is stuck open or missing.
I just went thru the same thing you can try and purge the lines make sure you have full radiator fluid then start it up hold it 2500rpms for 90 secs.
If that doesnt work its probably a stuck thermostat i had to buy one for my truck it was $128 i couldnt believe it. I put that baby in and now she blows REALLY REALLY hot air and my gauge works also. I see yours is a 96 hopefully they are cheaper.