HVAC System Fault Analysis Cases

Detailed HVAC system diagnostics including air conditioning failures, heating system problems, and ventilation issues.

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1998 Toyota Corolla Cooling System Diagnosis
1998 Toyota Corolla
The owner reports that their 1998 Toyota Corolla is running hot during low-speed situations. They have already replaced the left side cooling fan moto...
Toyota Corolla Coolant System
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Transmission Power Loss on Inclines
1999 Nissan Bluebird Eprise
The owner reports that the 1999 Nissan Bluebird Eprise drives well on flat surfaces but struggles to climb hills. Pressing the accelerator does not yi...
Nissan Bluebird transmission
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1989 Chrysler New Yorker Auto Temp A/C Issue
1989 Chrysler New Yorker
The owner reports that their 1989 Chrysler New Yorker is stuck in HEAT mode despite selecting the lowest temperature setting (65°F) on the Auto Temp c...
HVAC Auto Temp Control Chrysler New Yorker
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1996 Audi A4 Heater System Bubble Issues
1996 Audi A4
The owner reports that their 1996 Audi A4 has persistent air bubbles in the heating system, which affects heater performance. They have replaced the r...
Audi heating system coolant
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Impact of Extended Vehicle Storage on Tire Condition
2010 Hyundai Elantra
The owner is concerned about potential tire damage after leaving their 2010 Hyundai Elantra parked in a garage for a month while out of town. They wan...
tire_condition storage_effects vehicle_maintenance
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1998 Cadillac Deville Cooling System Water Loss
1998 Cadillac Deville
The owner reports that their 1998 Cadillac DeVille is losing coolant, needing frequent top-ups. They recently replaced the radiator cap but the issue ...
Cadillac cooling system water loss
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1987 Honda Accord Sputtering and Shaking Symptoms
1987 Honda Accord
The owner reports that their 1987 Honda Accord sputters and shakes during acceleration, particularly when the A/C is on. This issue occurs intermitten...
Honda Accord Sputtering
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1999 Subaru Legacy Viscous Connector Troubleshooting
1999 Subaru Legacy
The owner of a 1999 Subaru Legacy is experiencing issues related to the viscous connector after a transmission replacement. They are unsure if the con...
Subaru viscous coupling drivetrain
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1997 Isuzu Rodeo Blower Motor and Resistor Issue
1997 Isuzu Rodeo
The owner reports that their 1997 Isuzu Rodeo is not blowing air from the HVAC system. Initially, the blower functioned poorly on lower settings, but ...
Isuzu Rodeo blower motor
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1998 Oldsmobile HVAC Panel Control Malfunction
1998 Oldsmobile Other Models
The owner reports that the HVAC system in their 1998 Oldsmobile is not functioning properly. While the air conditioning works fine, air only comes out...
HVAC Oldsmobile Actuator
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2001 Audi A6 Auxiliary and Condenser Fans Inoperative
2001 Audi A6
The owner reports that both the auxiliary and condenser fans stopped working four days after the auxiliary fan was replaced. They have replaced the En...
Audi Cooling System Fan Operation
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1995 Ford Explorer HVAC Vent Control Issue
1995 Ford Explorer
The owner reports that the air conditioning system in their 1995 Ford Explorer is malfunctioning, as air is blowing out of the window and floor vents ...
HVAC vent control vacuum actuator
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Ram HVAC Blend Door Actuator Ticking Noise Diagnosis
2010-2020 Dodge Ram
The owner reports a persistent ticking noise when the ignition is turned on, and sometimes even when the key is not in the ignition. They suspect a fa...
HVAC actuator blend door
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Rear Heater Hose Removal for 1999 Chrysler Town & Country
1999 Chrysler Town & Country
The owner is attempting to remove the heater supply and return tubing for the rear heater on a 1999 Chrysler Town & Country with a 3.8L engine. The tu...
Chrysler Town & Country heating system
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Heater Not Blowing Warm Air into Cabin
1996 GMC Safari
The owner of a 1996 GMC Safari reports that warm air is not blowing into the passenger compartment. They have already replaced the thermostat and vacu...
GMC Safari HVAC
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Heat Issue in 1988 BMW 535i - Diagnosis and Repair
1988 BMW 535i
The owner of a 1988 BMW 535i has reported that after finally getting the vehicle started, the heating system does not work and only cool air is being ...
BMW heater coolant system
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1996 Honda Civic EJ6 Coolant Loss Diagnostics
1996 Honda Civic
The owner reports that their 1996 Honda Civic EJ6 is losing coolant despite replacing the head gasket, water pump, thermostat, and hoses. A pressure t...
coolant_leak head_gasket_failure engine_overheating
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No Heat in 1984 Oldsmobile Delta 88
1984 Oldsmobile Delta 88
The owner of a 1984 Oldsmobile Delta 88 reports that there is no heat coming from the heater, despite both hoses to the heater core feeling hot. The v...
Oldsmobile Delta 88 HVAC
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