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Old 01-28-2012, 03:37 PM   #1
Numatik
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Default how to fill radiator??

Hey guys,

Im changing out a water pump on my 04 silverado with the 4.3l. This is the first time I have seen a radiator without a cap, how do I fill this? It does have an overflow tank, then has a very small line from the top end of the tank to the radiator. What should I do?
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Old 01-28-2012, 03:52 PM   #2
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Default Re: how to fill radiator??

Here is the Drain and Fill directions,

Originally Posted by Alldatadiy
DRAINING AND FILLING COOLING SYSTEM

CAUTION: With a pressurized cooling system, the coolant temperature in the radiator can be considerably higher than the boiling point of the solution at atmospheric pressure. Removal of the surge tank cap, while the cooling system is hot and under high pressure, causes the solution to boil instantaneously with explosive force. This will cause the solution to spew out over the engine, the fenders, and the person removing the cap. Serious bodily injury may result.

NOTICE: When adding coolant, use DEX-COOL coolant. If silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner-at 50,000 km (30,000 mi) or 24 months.
The following notice applies to the 4.8L, 5.3L, and the 6.0L engines only.

NOTICE: DO NOT use cooling system seal tabs (or similar compounds) unless otherwise instructed. The use of cooling system seal tabs (or similar compounds) may restrict coolant flow through the passages of the cooling system or the engine components. Restricted coolant flow may cause engine overheating and/or damage to the cooling system or the engine components/assembly.

DRAIN AND FILL PROCEDURE

IMPORTANT: If you do not follow the procedure below, a low or high coolant level condition and/or vehicle damage could result.

Park the vehicle on a level surface.
Follow the steps below in order to remove the radiator surge tank fill cap:
Slowly rotate the cap counterclockwise.
Stop rotating and allow the hissing to stop.
After all hissing stops, continue turning counterclockwise in order to remove the cap.
Remove the drain hose from the left side of the radiator tank and reposition the hose to a catch pan.
Open the radiator drain cock.
Allow the system to drain completely.
Inspect the engine coolant:
Discolored - follow the flush procedure below.
Normal in appearance - Continue with the next step.
Close the radiator drain cock. IMPORTANT: When filling the cooling system use a50 to 60 percent concentration with DEX-COOL coolant.
Fill the system through the radiator surge tank opening.
Pre-mix a 50 to 60 percent solution of DEX-COOL and clean, drinkable water.
Slowly add the premixed solution to the system until the level is slightly above the surge tank split line.
Start the engine.
Idle the engine for 1 minute.
Loosely install the surge tank cap. Do not allow the system to build pressure.
Cycle the engine from idle to 3000 RPM in 30 seconds intervals until the engine coolant reaches 99°C (210°F) and the thermostat opens.
Shut off the engine.
Refer to step 3 in order to remove the radiator surge tank cap.
Start the engine.
Idle the engine for 1 minute. Fill the surge tank to 1/2 inch above the COLD FULL mark on the radiator surge tank.
Install the radiator surge tank cap.
Cycle the RPM. Idle the engine to 3000 in 30 second intervals until the engine coolant reaches 99°C (210°F).
Shut off the engine.
Top off the coolant, as necessary, to 1/2 inch above FULL COLD mark on the radiator surge tank.
Rinse away any excess coolant from the engine and the compartment.
Inspect the concentration of the coolant.
FLUSH PROCEDURE

IMPORTANT: Do not use a chemical flush.

Block the drive wheels.
Place the transmission in park (P) or neutral (N).
Engage the parking brake.
Run the engine until the thermostat opens.
Stop the engine.
Follow the drain and fill procedure using only clean drinkable water. Repeat the procedure if necessary, until the fluid is nearly colorless. Refer to the drain and fill procedure.
Fill the cooling system. Refer to the drain and fill procedure.
Water pump
Originally Posted by alldatadiy
REMOVAL PROCEDURE




Remove the air inlet duct. Refer to Air Cleaner Assembly Replacement in Powertrain Management.
Drain the cooling system. Refer to Draining and Filling Cooling System.
Remove the upper fan shroud. Refer to Fan Shroud Replacement.
Remove the cooling fan and clutch assembly. Refer to Fan Clutch Replacement
Remove the drive belt. Refer to Drive Belt Replacement in Powertrain Management.
Remove the outlet radiator hose from the water pump. Refer to Radiator Hose Replacement -Outlet.
Remove the by-pass hose.
Remove the water pump. Refer to Water Pump Removal in Cooling System.
INSTALLATION PROCEDURE




Install the water pump. Refer to Water Pump Installation in Cooling System.
Install the by-pass hose.
Connect the radiator outlet hose to the water pump. Refer to Radiator Hose Replacement -Outlet.
Install the drive belt. Refer to Drive Belt Replacement in Powertrain Management.
Install the cooling fan and clutch assembly. Refer to Fan Clutch Replacement
Install the upper fan shroud. Refer to Fan Shroud Replacement.
Install the air inlet duct. Refer to Air Cleaner Assembly Replacement in Powertrain Management.
Fill the cooling system. Refer to Draining and Filling Cooling System
Check the cooling system for leaks. Refer to Cooling System Leak Testing
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Old 01-28-2012, 03:54 PM   #3
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Default Re: how to fill radiator??

I did the water pump on my 04 with a 5.3 and I have a cooling system bleeder funnel. It screws onto the factory cap location and makes it the high point, fill it from the overflow tank and it will fill the radiator. I would suggest getting one of those funnels, you run it until its at operating temp and let the air bubble out. I Bleed the system took it for a 10 mile drive at 60 mph parked it let it cool down and checked it.
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Old 01-28-2012, 04:40 PM   #4
bigblue4x4
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Default Re: how to fill radiator??

the 4.3 is different from the 4.8,5.3,6.0L motors but basically the same when filling the cooling system up

fill the overflow until its full,let it sit for 5min
top off again
start the engine and add coolant as it drops
go for a drive until its fully warmed up
top off the coolant bottle
when the motor is cool top off the overflow bottle again
check the next day and top of if needed
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Old 01-28-2012, 10:48 PM   #5
Numatik
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Default Re: how to fill radiator??

Originally Posted by bigblue4x4 View Post
the 4.3 is different from the 4.8,5.3,6.0L motors but basically the same when filling the cooling system up

fill the overflow until its full,let it sit for 5min
top off again
start the engine and add coolant as it drops
go for a drive until its fully warmed up
top off the coolant bottle
when the motor is cool top off the overflow bottle again
check the next day and top of if needed
Thanks! This did it!
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Daily - 2004 Silverado, (4) 5 gallon tanks, 3 AZOB2s ,Slam SS all around, Slam 2 speed digital stealth valves, (5) kicker amps, 36 speakers and tweets. Lots white paint and black powdercoat and lots and lots of pinstriping
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