What's the recommended procedure to bleed the air from the cooling system on a 2.4L Twin Cam engine?
It has a built in bleeder line that goes from the coolant outlet on the head, to the resevoir. Therefore you dont have to bleed anything.
-da chinchilla
<img src="http://registry.gmenthusiast.com/images/jiggamon/avatar15569_2.gif">
Well....except for maybe the heater core lines. Those I am not sure about.
-da chinchilla
<img src="http://registry.gmenthusiast.com/images/jiggamon/avatar15569_2.gif">
So, you mean the lines are self-bleeding?
The reason why I ask these questions is that it seems that ever since I had my water pump replaced, sometimes after starting the car and when starting to drive away, I hear a gurgling noise from my dashboard area. I assume it's air in the coolant lines somewhere. And, also if idling, the temperature gauge goes up more than it used to. However, if I start driving or turn on the air conditioning, the temp gauge goes back to where it's supposed to be.
leave the res. cap off for awhile at idle, it gets air out most of the time.
I also replaced my water pump about a year ago, and ever since then my car has been running a little warmer. Just last week my heater core took a dump on me, so I replaced it, and vowed to never do a heater core on a 2.4 again. Problem is, this new one just crapped out on me today. I was having the same gurgling sounds coming from the dash, and all the sudden I need another heater core. I'm not exactly sure why this one blew, but I think it may have had something to do with air in the system. I too need help with this.
Roll with class, and roll with a$$
Quote:
It has a built in bleeder line that goes from the coolant outlet on the head, to the resevoir. Therefore you dont have to bleed anything.
Send your head gasket repair bill to 2.4 CavaWeir (a.k.a. jiggamon). You real answer that us GM Machnics know is, if you look on the coolant return line you will see a little nobe. With the engine off open it slightly untill the dexcool stops running out. This will bleed the coolant system.
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I have never bled mine and have not had any problems. There is a line at the top of the outlet pipe that goes to the resevoir. The air will bubble up to the top. I have no air bleeders on any of my hoses. Where is this little "nobe", and what is a nobe? The outlet line into the heater core, or from the engine to the resevoir? There is a little plastice thing that you can open on the heater core lines, and I use that to bleed the air out of the lines into the core, but other than that I have never found anything else.
-da chinchilla
<img src="http://registry.gmenthusiast.com/images/jiggamon/avatar15569_2.gif">
Yeah, I don't get it. What's a nobe? You mean knob? I don't see anything obvious for bleeding purposes. There are three lines going to the coolant reservoir. One thin one going towards the back of the engine, one thin one going towards the top of the radiator, and a thick one that seems to go underneath the engine bay and towards the engine and/or radiator. And to/from the firewall there are two hoses going to/from the engine. Between the two hoses there is something that at first glance looked like something that would be be used for bleeding the system, but I think it's something to just keep the two hoses aligned in place...
Can you explain a bit more where this "nobe" is that you described and what hose it's on? And you said "With the engine off open it slightly untill the dexcool stops running out.". Ummm... don't you mean: open it slightly until dexcool STARTS running out... meaning that you open the "nobe" to let out the air, and as soon as the Dex-Cool starts running out, all the air has been bled?
Gary, I see you are just as confused by that post as I am.
The little piece between the two heater core hoses that run into the firewall, has an allen key socket in it. If you unscrew that you can fill until the dexcool starts running out, then close it. That is how I bled the lines to the heater core, but they do nothing for the air in the engine. The air will rise...to the highest point, which would be the head. At the outlet pipe, there is a metal line that runs around the back of the engine, joins a rubber hose and goes into the reservoir...that is an air bleed. So if you run with the cap off the reservoir for a few minutes, it is enough to get the air out of the engine. Other than that, I dont know where there would be a bleeder.
-da chinchilla
<img src="http://registry.gmenthusiast.com/images/jiggamon/avatar15569_2.gif">
sorry to bring up an old topic, but if some one could halp me out with this... i swapped the motors in my car recently and it was my first time ever doing this by myself. what i h had the hoses on the heater core backwards? i believe i have air in my system or something put together wrong, my car heats up and spit out all my coolant every time. i put new t-stat, changed my reservoir, let it run forever with the car off. tried every thing. i dont know what to do any more..
