98 buick century custom thermostat


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1997-1999 Buick Century (Replace HVAC Controller, Splice into Backlighting Circuit)

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

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temperature variation between the left and right hand ducts. Typical concerns may include that the right side of the vehicle cools down but the left stays warm or the opposite. This condition is sometimes associated by the customer with a recent service visit for other non-related repairs. The codes, DTC B0361 or B0441, may be present but will not illuminate a telltale lamp. The HVAC controller unit and the TEMP door actuator motors rely on a feedback system that supplies the controller with count values in order to accurately adjust the air temperature. When battery power is interrupted to the HVAC controller, the current actuator position values are lost. When power is restored, the controller will perform a “sweep test” of the doors from full cold to full hot and record the end values for reference. Over time, the TEMP doors may develop some flexing when run to their extremes. This flexing allows the count values to run out of range (beyond 0-255) and results in DTC code B0361 or B0441 to set. A revised HVAC controller has been released with new programming that allows for a wider tolerance in the expected range of the TEMP door. Replace the controller using the procedure below: Important: On the 1997 Buick Century and Regal, additional steps are required. You will have to run a jumper wire to the new HVAC controller. Be sure to follow the additional 1997 model year steps below. 1. Disconnect the negative battery cable. Important: On the Buick Regal, the console must first be removed to access the HVAC controller. For Buick Century and Oldsmobile Intrigue, skip to Step 10. Apply the parking brake and block wheels. Shift the transmission to first gear. Remove the console trim plate and disconnect the electrical harness. Disconnect the cigarette lighter sockets. Remove the console storage box. Remove the console control plate and disconnect electrical harness for traction control and heated seats, if equipped. 8. Remove the console retaining bolts. 9. Remove the console from the vehicle. 10.Remove the HVAC trim panel, if equipped. 11.Remove the HVAC controller retaining bolts. 12.Disconnect the electrical harness. 13.Discard the HVAC controller.

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1997 Buick Century Automatic Heater A/C Control

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Filed Under (Buick) by admin on 07-07-2010

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Remove or Disconnect 1. Battery ground (negative) cable. 2. Front floor console (Buick only). 3. Instrument panel trim plate. 4. Heater A/C control mounting screws. 5. Heater A/C Control. 6. Electrical connectors. Install or Connect 1. Electrical connectors. 2. Heater A/C control. 3. Heater A/C control mounting screws. Tighten Screws to 2 N.m (18 lb. in.). 4. Instrument panel trim plate. 5. Front floor console (Buick only). 6. Battery ground (negative) cable.

2001 Buick Century Custom DIAGNOSTIC TROUBLE CODE INDEX

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Filed Under (Buick) by admin on 17-12-2010

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Definition Body Control System Malfunction Chassis Control System Malfunction HO2S 1 Heater Circuit MAF System Performance MAF Sensor Circuit – Low Frequency TP Sensor Circuit – High Voltage ECT Excessive Time To Enter Closed Loop Fuel Control ECT Below Thermostat Regulating Temperature HO2S 1 – Insufficient Activity For Closed Loop Operation HO2S Circuit Low Voltage – Sensor 1 HO2S Circuit High Voltage – Sensor 1 HO2S Circuit Slow Response – Sensor 1 Injector No. 5 Control Circuit Injector No. 6 Control Circuit High Transmission Fluid Temperature Fuel Pump Control Circuit Idle Speed – Low Idle Speed – High A/C Refrigerant Pressure Sensor Circuit System Voltage PCM Internal Program Fault PCM Not Programmed Generator Performance Malfunction Indicator Light Control Circuit Transmission Fluid Temperature Sensor Circuit Malfunction

2000-2001 Buick LeSabre Steering Vibration/ SHudder During Parking Manuever

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Filed Under (Buick) by admin on 14-11-2010

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Steering Vibration/Shudder/Moan During Parking Maneuvers on Dry Pavement (Install Power Steering Pressure (Inlet) and/or Return (Outlet) Hose Assembly) 1995-99 Buick Riviera 1997-2001 Buick Park Avenue, Ultra 2000-2001 Buick LeSabre 2000-2001 Pontiac Bonneville steering vibration, shudder or moan noise when steering during parking maneuvers on dry pavement. Correction Install a new power steering pressure (inlet) hose assembly on the following vehicles: • 1995-98 Buick Riviera • 1997-98 Buick Park Avenue and Ultra Install a new power steering pressure (inlet) and return (outlet) hose assembly on the following vehicles: • 1999 Buick Riviera • 1999-2001 Buick Park Avenue and Ultra • 2000-2001 Buick LeSabre • 2000-2001 Pontiac Bonneville 1. Verify that the power steering pump reservoir is full. • If fluid level is low, fill and check for leaks. • If power steering system has air in the system, perform the “Bleeding Air from Power Steering System” procedure as described in the Power Steering System sub-section of the Service Manual. Important: When performing the “Bleeding Air from Power Steering System” procedure, it is important that the front of the vehicle is supported by the lower control arms. If the vehicle is not supported by the lower control arms, the procedure may cause the strut bushing to dislocate and cause new concern. Verify that the accessory drive belt is in good condition and that the pulleys are not bent or damaged. Verify proper belt tension and operation of the belt tensioner. Check for power steering hose ground out conditions. Check for good engine idle and correct engine RPM. Check to see that the rear transaxle mount does not have a plastic assembly aid installed which is used 2. 3. 4. 5. 6.

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2003 Chevrolet Trailblazer DTC P0128

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Filed Under (Chevrolet) by admin on 18-01-2011

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Tests/Procedures: Potential Causes: Tech Tips: Diagnostic Codes: 1. Replace the thermostat and test drive to see if the code returns. Thermostat This code indicates the engine has not reached a set temperature based on engine run time. P0128 Reported Fix Details 2003 Chevrolet Trailblazer, 4.2L * Replaced Engine Thermostat – We replaced thermostat (with housing) and refilled system with fresh coolant. Cleared code and test drove. now vehicle comes up to operating temp as it should. 2003 Chevrolet Trailblazer, 4.2L * Thermostat – Replaced the t-stat and alol is fine. Did notice that ect at cruise warm is around 210F . Seems high , will watch on other vehicles. 2005 Chevrolet Trailblazer, LS 4.2L * Replaced Engine Thermostat – replaced thermostat NOTE: it is on the side of the engine at the lower radiator hose 2005 Buick Rainier, 4.2L, Vin S, Eng Cfg L6, USA/Canada * Thermostat – DTC P0128, Engine not reaching operating temperature, Replaced thermostat, retest OK Confirmed Fix Engine Thermostat Engine Thermostat Engine Thermostat Engine Thermostat

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