Well, I just looked in the Helm manual for my 3.0L V6 (LFW), and there's nothing earth-shattering in there. I also have just the "surge tank" on mine ... no radiator cap. The Manual just says:
(NOTE: I've trimmed this procedure from the Helm Manual for conciseness):
1.) Remove the cap from the Surge Tank, then raise the vehicle
2.) Drain coolant out the Drain Cockk (NOTE: others prefer to pull the lower radiator hose for fear of breaking the plastic Drain Cockk). Collect the coolant in a large drain pan.
3.) Inspect the coolant ... if "discolored", then perform a flush, otherwise just continue (to refill)
4.) Reinstall Drain Cockk to 2 Nm (18 lb in) ... (or reattach radiator hose), then lower the vehicle
5.) Fill the Surge Tank with 50/50 DEX-COOL/Water mix until the level reaches the base of the Surge Tank
6.) Wait 30 seconds for level to stabilize, then continue filling until the level stabilizes for at least 2 minutes
7.) Idle the engine in PARK or NEUTRAL (with Parking Brake engaged)
8.) Continue slowly filling the Surge Tank until the level stabilizes at the base of the tank.
9.) Re-install the pressure cap on the Surge Tank
10.) Raise engine RPM to 2500rpm for 30-40 seconds
11.) Shut the engine OFF
12.) Allow engine to cool
13.) Remove pressure cap and repeat steps 5-11 until coolant level has completely stabilized within the Surge Tank
14.) Use a Coolant and Battery Fluid Tester ("J 26568") to test the concentration of engine coolant
15.) Top off the Surge Tank if necessary, and always do a final inspection for leaks.
2011 Equinox 1LT (dlvd. Jan 2011): Summit White / 3.0 L V6 / FWD / Pioneer Stereo / 18" Wheels / 143k miles [15-MAR-2020]
2002 Impala 1LT (dlvd. Jun 2002): Summit White / 3.4 L V6 / FWD / Cassette-CD Combo /230k miles [15-MAR-2020]
Last edited by Colt Hero; 02-16-2020 at 10:21 AM.