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2004 impala coolant leak

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2004 Chevrolet Chevy Suburban Information on Gradual Coolant Loss Over Time with No Evidence of Leak Found

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Some vehicles may experience a gradual coolant loss over time. A very low percentage of cylinder head(s) manufactured with an embossed Castech logo may develop a porosity crack in a very specific area. Inspect the cylinder head assembly to determine if the casting was manufactured by Castech. This can be accomplished by inspecting for their casting logo located on top of the intake port, under the rocker arm support rail and in the spring deck cavity portion of the cylinder head. Important: If the cylinder head(s) are Not a Castech casting, follow normal diagnostic procedures in SI to determine the cause of the coolant loss. Refer to the following illustrations on how to identify Castech casting and/or the very specific areas of the cylinder head(s) for a coolant leak from porosity. If the cylinder head(s) is a Castech casting (1), inspect the area around the five oil drain holes for witness marks indicating coolant seepage over time (2). Important: If No evidence of coolant loss is found on inspection of Castech casting cylinder head (s), follow normal diagnostic procedures in SI to determine the cause of the coolant loss

Low Engine Coolant Level Indicator Always On (Diagnose Low Coolant Level System Operation/Check Sensor for Oil Contamination)

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2000-2002 Buick Century, Regal 2000-2001 Chevrolet Lumina 2000-2002 Chevrolet Impala, Monte Carlo 2000-2002 Pontiac Grand Prix 2000-2002 Oldsmobile Intrigue 1. Verify that the coolant is at proper level in the radiator and the coolant recovery bottle. If the coolant is low, add proper amount of 50/50 water and DEX-COOL® mixture. If the low coolant light operates properly, diagnose the cooling system for loss of coolant as outlined in SI. DO NOT proceed further with this bulletin. 2. Remove the low coolant level sensor. Refer to Coolant Level Module Replacement in the Engine Cooling sub-section. 3. With the key on, the engine off and the coolant level sensor disconnected from the vehicle wiring harness, observe the low coolant light: Subject: Low Engine Coolant Level Indicator Always On (Diagnose Low Coolant Level System Operation/Check Sensor for Oil Contamination) Models: 2000-2002 Buick Century, Regal 2000-2001 Chevrolet Lumina 2000-2002 Chevrolet Impala, Monte Carlo 2000-2002 Pontiac Grand Prix 2000-2002 Oldsmobile Intrigue • Light is on — Chassis wiring or instrument cluster concern. Follow the appropriate diagnostic information in SI. • 4. With the key off, connect the coolant level sensor into the vehicle’s wiring harness. Connect a ground wire (1) to the battery negative terminal. Using a sharp probe (3) attached to the ground wire, ground the coolant sensor probe (2) as shown in the illustration. Make sure a good contact is made. With the key on and the engine off, observe the low coolant light for at least 15 seconds. 5. Using a small wire brush or emery cloth, polish the low coolant level sensor probe to remove any film or oxidation. The probe should be a bright brass color when finished. Use Brake Parts Cleaner to flush removed deposits from the low coolant sensor probe. Reinstall the low coolant sensor into the vehicle and proceed to Step 6. 6. Flush the cooling system and install new DEX-COOL® mixture as outlined in the SI. Check the vehicle’s warranty history to determine if any engine gasket had recently been changed. If there has not been a recent gasket replacement, locate and repair the source of the engine oil contamination

2004 Chevrolet TrailBlazer Noise Coming From Instrument Panel Cluster (Replace Instrument Panel Cluster (IPC)) Repair Manual

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This bulletin is being revised to add model years and provide important repair information. Please discard Corporate Bulletin Number 04-08-49-015 (Section 08 — Body and Accessories). Condition Some customers may comment on a noise coming from the instrument panel cluster (IPC) while driving or on initial start-up. Instrument clusters may contain stepper motor gages that can make noise during the following conditions: Subject: Noise Coming From Instrument Panel Cluster (Replace Instrument Panel Cluster (IPC)) Models: 2003-2005 Buick LeSabre 2003-2007 Buick Rendezvous 2004-2005 Buick Rainier 2003-2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2003-2005 Chevrolet Cavalier, Impala, Monte Carlo 2003-2006 Chevrolet Avalanche, Suburban, Tahoe, TrailBlazer EXT 2003-2007 Chevrolet Silverado Classic, TrailBlazer 2003-2007 Chevrolet Kodiak Models 2004-2006 Chevrolet SSR 2003-2006 GMC Envoy XL, Yukon, Yukon XL 2004-2005 GMC Envoy XUV 2004-2007 GMC Envoy 2003-2007 GMC Sierra Classic 2003-2004 Oldsmobile Bravada 2003-2005 Pontiac Aztek, Bonneville, Sunfire 2003-2005 HUMMER H2 Attention: Appropriate repair is based on vehicle build date. Use GMVIS to determine the vehicle build date. • Initial startup (gages zero/reset)

2008-2010 FORD F-Super Duty DIESEL ENGINES REPEAT RADIATOR LEAK BUILT ON OR BEFORE SERVICE PROCEDURE

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DIESEL ENGINES REPEAT RADIATOR LEAK BUILT ON OR BEFORE ISSUE ECT temp. Some 2008-2010 F-Super Duty vehicles built on or b. Test results/next steps: before 9/14/2009 and equipped with a 6.4L diesel engine may exhibit repeat radiator leaks due to (1) If EOT is less than 8 °F (4.4 °C) malfunctioning (hyper-extended) high temperature higher than ECT, and the coolant temp thermostats. fluctuates roughly 5 °F (2.7 °C) – the thermostats are okay and do not need ACTION to be replaced. Replace just the Follow the Service Procedure steps to correct the radiator. Refer to WSM, Section 303-03 condition. (Engine Cooling). SERVICE PROCEDURE (2) If EOT exceeds ECT by greater than 8 °F (4.4 °C) or if the ECT readings 1. Verify the coolant leak is from the radiator, refer fluctuate 10 to 12 °F (5.55-6.66 °C) to pinpoint test (PPT) A found in the Workshop roughly every 30 seconds – replace Manual (WSM), Section 303-03. both thermostats and radiator. Refer to 2. Verify the venturi tee is installed. WSM, Section 303-03 (Engine Cooling). a. If installed, confirm it is installed correctly (note – orientation direction on part). 5. If vehicle is not drivable and the coolant leak is found to be from the radiator, remove and b. If not installed, install Venturi Tee Kit on replace both thermostats and radiator. Refer to vehicles built on or before 5/15/2008. WSM, Section 303-03 for both radiator and thermostat removal procedure and approved 3. Prepare the vehicle for a test drive. cooling system draining, filling and bleeding a. If the coolant leak at the radiator is large procedures. enough to cause an unsafe test drive or potential for engine/vehicle damage, proceed PART NUMBER PART NAME to Step 5. 8C3Z-8575-D Thermostat Assembly 8C3Z-8009-B Radiator Assembly b. Before driving the vehicle confirm the 8C3Z-8B379-B Venturi Tee coolant level is at minimum level or above in the degas bottle. If required, add 50/50 WARRANTY STATUS: Eligible Under Provisions Of mix to coolant bottle. New Vehicle Limited Warranty Coverage 4. Test Drive – use an Integrated Diagnostic IMPORTANT: Warranty System (IDS) or equivalent and monitor engine coverage limits/policies are oil temperature (EOT) and engine coolant not altered by a TSB. temperature (ECT) parameter identifiers (PIDS). Warranty coverage limits are determined by the identified causal par

4L60-E Automatic Transmission/Torque Converter Clutch (TCC) Shudder, Water in Transmission (Repair Transmission and Replace Transmission Filler Tube, Level Indicator and Seal)4L60-E Automatic Transmission/Torque Converter Clutch (TCC) Shudder, Water in Transmission (Repair Transmission and Replace Transmission Filler Tube, Level Indicator and Seal) Transmission Repair

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Transmission Repair 1. Remove the transmission. Refer to the appropriate SI procedure. 2. Disassemble and inspect the transmission. Refer to Unit Repair Automatic Transmission – 4L60-E/4L65-E. Important: Subject: 4L60-E Automatic Transmission/Torque Converter Clutch (TCC) Shudder, Water in Transmission (Repair Transmission and Replace Transmission Filler Tube, Level Indicator and Seal) Models: 2004-2005 Buick Rainier 2003-2005 Chevrolet TrailBlazer Models 2003-2005 GMC Envoy Models 2003-2004 Oldsmobile Bravada 2005 Saab 9-7X with 4.2L In-Line 6 Cylinder Engine (VIN S — RPO LL8) • Visible rust on the transmission fluid level indicator. • Visible water in the oil pan. • A milky white substance inside the pan area. • Spacer plate gaskets that appear to be glued to the spacer plate, valve body or case. • Rust on internal transmission iron/steel components. • Remove the surge tank cap and examine the coolant for signs of contamination with transmission fluid (the coolant will have a milky, not clear appearance). • If the coolant has a normal, clear appearance, the radiator should not be replaced. • The cooler can also be tested by following the Coolant System Leak Test procedure (SI Document ID# 877442). Do NOT replace a radiator without verifying that the transmission oil cooler is leaking. If water or coolant is found in the transmission, the following components MUST be replaced. Replace the Transmission Fluid Filler Tube, Seal and Fluid Level Indicator WITH the transmission REMOVED from vehicle. 1. Remove the transmission fluid filler tube from the transmission. 2. Replace the transmission fill tube seal, P/N 1259475. 3. Replace the transmission fill tube, P/N 15000220, following the appropriate SI Document for Transmission Installation. 4. Replace the transmission fluid level indicator, P/N 15069769 when appropriate during the transmission installation. Replace the Transmission Fluid Filler Tube, Seal and Fluid Level Indicator with the transmission in the vehicle. 1. Remove the air cleaner outlet duct. Refer to Air Cleaner Element Replacement (SI Document ID# 1364496). 2. Remove the transmission fluid level indicator from the filler tube. 3. Remove the filler tube nut (2) located on the right side of the engine. 4. Remove the filler tube from the vehicle. Tip It is necessary to remove the two A/C line (suction line / low side of muffler hose) retainers and reposition • Replace all of the rubber type seals. • Replace all of the composition-faced clutch plate assemblies including the band. • Replace all of the nylon parts (Thrust Washers). • Replace the torque converter. • Thoroughly clean and rebuild the transmission, using new gaskets and oil filter. • Flush and flow check the transmission oil cooler using J 45096. Refer to Corporate Bulletin Number 02-07-30- 052C or newer – Automatic Transmission Oil Cooler Flush and Flow Test Essential Tool J 45096 TransFlow .
the A/C line to allow proper clearance for installation of the new transmission fluid fill tube. 5. Remove the A/C line at the oil level indicator tube bracket nut. 6. Remove the A/C bracket bolt from the engine lift hook. 7. Reposition the A/C line upward. 8. Install the new transmission filler tube, P/N 15000220, into position but NOT into the transmission at this time. 9. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information (SI Document ID# 744862). 10. Remove the two bolts securing the transmission heat shield to the transmission. 11. Remove the transmission heat shield from the transmission. 12. Remove the old filler tube seal from the transmission case. 13. Install a new seal, P/N 1259475 into the transmission case. 14. Position the new transmission filler tube into the transmission seal. 15. Install the transmission heat shield to the transmission. 16. Install the two bolts securing the transmission heat shield to the transmission. Tighten Tighten the bolts to 17 N·m (13 lb ft). 17. Lower the vehicle. 18. Install the nut securing the filler tube to the stud. Tighten Tighten the nut to 10 N·m (89 lb in). 19. Reposition the A/C line into place. 20. Install the A/C line bracket to the oil level indicator tube stud and secure the bracket with the nut. 21. Install the A/C line bracket to the engine lift bracket and secure the A/C bracket with the bolt