Heater not blowing heat

Heater problem
1992 Chevy Truck V8 Four Wheel Drive Automatic

no heat. Fluids up in resavoir. New thermastat 195. Hot guage isa little higher than usual but not much. Heat comes a bit then it blows cold

I would say you may have a bad thermostat, they have been known to sell bad ones from time to time. You can check it by placing it in a cup of water that is at the temp of the rating of the thermostat.
If it is a 195 degree thermostat, place it in a glass container of 195 degree water and see if it opens, then cool it and see if it closes.
If the thermostat is good you could either have vapor lock in the cooiling system, a blocked heater core or possibly a lazy water pump.

My heat is only blowing cold, does not matter the setting. I replaced the thermostat (works), I flushed the heater core, topped fluid and removed any air in the system. I pulled the actuator which does work off and manually moved the arms for the vents and still it just blows cold. So the heater core in feed and out are both hot, thermostat works, actuator is working and the fluid is topped with no air leaks, but still no heat. What do I do next?

Heater problem
1993 Chevy Truck 6 cyl Two Wheel Drive Automatic 162000 miles

my brother and I changed the thermostat and the
water pump but its a rebuild we have changed the
heater core and put new intake manifold gaskets in
and still have no heat please help

Possibly hoses are crossed and fluid is not passing through the heater core?

Engine Cooling problem
1987 Chevy Truck V8 Two Wheel Drive Automatic 99,000 miles

iI have new radiator, heater core, water pump, and thermostat, and intake gasket was replaced a few months back, I am getting only luke warm air when I turn on the heater, also the radiator cap is new. The tenp gauge barely makes it to the quarter mark. Need Help! What would cause heat not to work?

I just did thermostat and heater core and I am getting luke warm heat what could be going on here? Blend door is opening and closing as it should I checked that when I did heater core. I cant figire out what to check or do next.

Heater problem
1977 Chevy Truck V8 Four Wheel Drive Manual

We replaced the thermastat first and it did not help. So we replaced the heater core in our pickup because the heat was not getting hot. It did not help at all or actual made it worse. Any suggestions?

Heater problem
1979 Chevy Truck V8 Four Wheel Drive Automatic N/A miles

hello

my truck is having trouble with the heater it works just enough to defrost the windows some times ive already flushed out the lines, no leaks, and replaced all the hoses and still isn't putting out enough heat what else could be the problem

My first guess would be the heater control valve.
I would by-pass it by using a piece of tubing or a deep socket that fits the ID of the hose and some hose clamps.

If that works, its a control valve not working. Be it the valve or what ever controls the valve ie heater controls inside the cab.

David

That means the whole dash would have to be removed right

That means the whole dash would have to be removed right[/quote:e9c766723f]

Best I remeber, the heater control valve on that modle is under the hood. Attached to the intake.

David