vacuum line gmc yukon diagram


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2004 Jeep Grand Cherokee Limited DIAGNOSIS AND TESTING – VACUUM RESERVOIR

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Filed Under (Jeep) by admin on 18-11-2010

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1. Disconnect vacuum hose at speed control servo and install a vacuum gauge into the disconnected hose. 2. Start engine and observe gauge at idle. Vacuum gauge should read at least ten inches of mercury. 3. If vacuum is less than ten inches of mercury, determine source of leak. Check vacuum line to engine for leaks. Also check actual engine intake manifold vacuum. If manifold vacuum does not meet this requirement, check for poor engine performance and repair as necessary. 4. If vacuum line to engine is not leaking, check for leak at vacuum reservoir. To locate and gain access to reservoir, refer to Vacuum Reservoir REMOVAL /INSTALLATION . Disconnect vacuum line at reservoir and connect a hand-operated vacuum pump to reservoir fitting. Apply vacuum. Reservoir vacuum should not bleed off. If vacuum is being lost, replace reservoir. 5. Verify operation of one-way check valve and check it for leaks. a. Locate one-way check valve. The valve is located in vacuum line between vacuum reservoir and engine vacuum source. Disconnect vacuum hoses (lines) at each end of valve. b. Connect a hand-operated vacuum pump to reservoir end of check valve. Apply vacuum. Vacuum should not bleed off. If vacuum is being lost, replace one-way check valve. c. Connect a hand-operated vacuum pump to vacuum source end of check valve. Apply vacuum. Vacuum should flow through valve. If vacuum is not flowing, replace one-way check valve. Seal the fitting at opposite end of valve with a finger and apply vacuum. If vacuum will not hold, diaphragm within check valve has ruptured. Replace valve.

2003 GMC Yukon 5.3L, Lean trouble codes P0171, P0174, P0101 and P0300 are setting

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Filed Under (GM) by admin on 11-06-2010

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2001 Chevrolet Suburban 1500 5.3L 2003 GMC Yukon 5.3L, FLEX, Vin Z 2003 Cadillac Escalade 6.0L, Vin N, 2003 GMC Yukon XL 1500 5.3L, FLEX, Vin USA/Canada Z 1. Check for leaking intake manifold seals around the intake ports. The intake gasket seals may be leaking around the intake ports, causing a lean condition. Many times they will leak around the bottom side of the port, making it a challenge to detect the vacuum leak. May also note lower than normal Mass Airflow (MAF) readings if the seals are leaking around the ports. 2. If leaking intake gasket seals are found, replace the gaskets with the updated part number.

2005 GMC Yukon/ Denali XL 1500 Blower Motor Control Processor Replacement

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Filed Under (GM) by admin on 14-10-2010

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1. If equipped, remove the sound insulator panel. 2. Disconnect the electrical connector at the blower motor. 3. Disconnect the electrical connector (4) from the blower motor control processor (2). 4. Remove the blower motor control processor retaining screws (3) from the HVAC module (1). 5. Remove the blower motor control processor (2) from the HVAC module (1). INSTALLATION PROCEDURE 1. Install the blower motor control processor (2) to the HVAC module (1). 2. Install the blower motor control processor retaining screws. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the screws to 1.6 N.m (14 lb in). 3. Connect the electrical connector (4) to the blower motor control processor (2). 4. Connect the electrical connector at the blower motor. 5. If equipped, install the sound insulator panel.

2000 GMC Truck K 2500 Oil Line, Engine Service and Repair

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Filed Under (GM) by admin on 29-07-2010

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Removal Procedure The engine oil cooler is an integral part of the radiator. The oil cooler lines are serviceable. 1. Remove the plastic cap from the connector by pulling back along the pipe. 2. Use a small pick-type tool or screwdriver in order to release 1 of the open ends of the retaining ring from the connector fitting. 3. Rotate the retaining ring out of position on the connector fitting. Remove the ring completely. 4. Discard the retaining ring clip. 5. Pull outward on the pipe in order to remove the pipe from the connector fitting. 6. Disengage the oil cooler line retaining clip at the fan shroud. 7. Remove the oil cooler line from the radiator). 8. Raise and support the vehicle. Refer to Vehicle Lifting. 9. Remove the under body protective shields. 10. Remove the oil cooler line junction block bolts. 11. Remove the oil cooler line clip bolt. 12. Remove the oil cooler lines. 13. Discard the gasket. 14. Inspect all of the fittings, the connectors and the cooler lines for damage or distortion. Installation Procedure 1. Install the oil cooler lines using a new gasket. Notice: Refer to Fastener Notice in Service Precautions. 2. Install the oil cooler line junction block bolts. Tighten the bolts to 9 N.m (80 lb in). 3. Install the oil cooler line clip bolt. Tighten the bolts to 50 N.m (37 lb ft).

2005 Chevrolet Malibu Vacuum Brake Booster Check Valve and/or Hose Replacement Removal Procedure

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Filed Under (Chevrolet) by admin on 19-10-2010

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1. Disconnect the brake booster vacuum check valve (1) from the brake booster. 2. If the vacuum check valve (1) needs to be separated from the vacuum hose (3), release and reposition the clamp (2) on the vacuum hose (3) and remove the check valve (1) from the hose (3). 3. If replacing the vacuum check valve (1), remove the grommet (4) from the brake booster and discard the grommet. 4. If removing the vacuum hose (2), take note of the vacuum hose routing then disconnect from the engine intake manifold connection (3) by releasing tension on the vacuum hose clamp (1) and sliding the vacuum hose (2) off the intake manifold connection (3). Installation Procedure Important: A small amount of denatured alcohol can be used as an assembly aid when installing the vacuum check valve and/or grommet. Do NOT use soap. 1. If the vacuum hose (2) was removed, install the vacuum hose into position on the vehicle as noted prior to removal, then connect the vacuum hose (2) to the engine intake manifold connection (3) and secure with the vacuum hose clamp (1). 2. If the vacuum check valve (1) is being replaced, install a NEW grommet (4) to the brake booster. 3. If the vacuum check valve (1) was separated from the vacuum hose (3), install the check valve (1) to the vacuum hose (3). Install and secure the clamp (2) into position on the hose (3). 4. Connect the brake booster vacuum check valve (1) to the brake booster.