is there coolant in the overflow tank for the engine to suck up? i have never had an issue with getting air out of the system as long as the overflow tank was full. i have also watched engines chug back coolant from the overflow as you add it when the engine is hot but low on coolant

 

Doesn't matter. The temp **** only controls a door in the heater box. The heater core is a constant flow system, so it doesn't matter if you have the a/c on full blast, there is still coolant circulating thru the heater core. The air just doesn't go thru it.

The radiator can only suck out of the overflow tank if the system is closed up. If the radiator cap is off, it will never draw coolant from the overflow.

 

My mistake

 

i know but i would also assume he has to be putting it back on at some point if he is driving around the neighborhood. plus i don't think i saw anyone ask that question. i know my moms old car was a pain to get air out of he cooling system but it pretty much did it by itself using the overflow and enough running it up to temp and then letting it sit and cool but there was no rad cap on it that would allow me to pour coolant directly into the cooling system.

 

I am not sure I have EVER ran into a vehicle that is more of a pain to get all the air out of the system, than a 2nd gen dodge truck. Heck, even the old Corvettes weren't this bad, and in those, the radiator fill was BELOW the top of the engine.......

 

i have never had an issue getting air out of the system and i really don't see what would be different about a 2nd gen that would make it harder to get air out of the system than any other vehicle. never had an issue getting the air out of my 93 and it has the same engine/setup as the 2nd gens.

 

I have never had any issue getting the air out of a cooling system as well. The last one I did was my Step-Son's 2003 Buick Regal. Replaced all the hoses and water pump then flushed the coolant from the block, radiator and heater core. Put everything back together and filled it. Started the engine, opened the radiator cap, and kept filling it up until I got all the air purged from the vehicle. He's a question though, for the 2nd gen Ram, what's the mixture on the coolant supposed to be, and what are you using? I've seen people try to run straight coolant before without a say 50/50 mix and it won't cool right.

 

I’ve always used 50/50 but with this problem I’ve been re filling with water. Could this be the problem lol I was always under the assumption only a little antifreeze and mostly water(I’m in south Florida) never gets freezing temps

ive also never had issues either burping a system, mechanics at my job said these trucks are a PITA also to do it.

 

Heater core anyone?

 

Neat to know about the constant flow through the heater core.