So I can drive it on the free way at 70 the only way I can get the truck to heat up. About 4 years ago the heater core was replaced I have heard that if u dont get the air bubles out it will cause that but I got alot of air bubles out it still doesnt heat up do u guys have any ideas ?

 

probably still got air bubbles.

a half way functioning heating system in these trucks will run you out of the cab.

Have you verified that your engine is getting up to temperature?

Best way to clean out crap and get the air out is to backflush the heater core.

 

When I am at high speeds the truck says its getting to temp. But intown it the gage never moves. And how do u back flush the heater core cuz I was squeezeing the radiator hose and I had to add proably a quart of anti freeze ?

 

Squeazing the hose??? What?

Best way to burp the air out is to park the passenger side up higher than the driver. Like drive that side up on a curb. Take the rad cap off and start engine and let it idle. It will take at least 20 min after its warmed up. It must go through several cycles.

If you watch the fluid level in rad you can see little bubbles come up then it will suck some coolant down. that's good. Add some back in and wait till it stops doing that. It will take a while. Be patient.

You got a stock thermostat? Any leaks?

 

Yes stock thermostat. And no leaks trucks solid besides that and well when I park it it doesnt warm up ? And okay I will try that though !

 

If the gauge doesn't come up off cold when driving around town, replace the thermostat, THEN do the thorough burp.

 

What if it heats up when I am on the freeway still replace it

 

The engine should hit operating temp, even if it is just sitting still. if it doesn't, time for a new stat.

 

+1. My dash gauge wouldn't budge off 130. Then I replaced the thermostat, drained coolant, filled in up, burped, then added more coolant while it was running. Result - i now have heat in my truck and the dash gauge works. Make sure to put the rad cap back on very well...my friend didn't put it back on my truck well and the engine got a good coating of coolant. Now I have an air bubble trapped again. Crap! Time to try burping on a 30 degree hill and if that doesn't work, backflush the system. But I still have heat and the dash gauge still works!

 

I just tried burbing it on a curb for 45 min gague didnt move and I could stick my finger in the anti freeze it wasnt hot ? So when I go 55 to 70 it heats up why does it do that and the gauge works fine ?