Suburban Cooling System Question

Should be a 16lb cap. Lever or non lever.

That's what I found on Autozone tonight too (should be around 16). Seems as if the pressure rating is already too tight with this 13 which is *seemingly* keeping the cap from allowing the overflow to work. Any thoughts on that? As I mentioned, it worked great until the dealer did the flush and replaced the cap. Think somehow having a

On many GM cars there is a little screw in the thermostat housing. It is there to release air from the cooling system. If there is a screw there that will lead you in the right direction (take the screw out for a minute). A second thought is that AC Delco caps do not have a pressure release lever.

That's what I found on Autozone tonight too (should be around 16). Seems as if the pressure rating is already too tight with this 13 which is *seemingly* keeping the cap from allowing the overflow to work. Any thoughts on that? Think somehow having a 13lb cap on there might be keeping the burp tank system from working? ________________________________________________________________________

No.

There is probably some air left in the system that compresses so the expanding coolant does not escape through the cap.

Bleed the air from the system (and get a 16-lb cap).

Good luck.

Rodan.

Since the dealer apparently used the wrong pressure rated cap, I believe I would go back to them. Dont worry about what you have already paid these people to do.

Those caps are supposed to relieve vapor or liquid coolant to the overflow tank as the engine heats and the pressure increases. Then when the engine cools, they are supposed to suck the liquid back into the engine, minus air. As others have said, air bubbles can cause a problem, but the damn dealership should never have released it to you without it being properly filled.