HVAC System Fault Analysis Cases

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

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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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1999 Dodge Truck Cooling System Issues
1999 Dodge Ram Truck
The owner reports issues with the air conditioning system in their 1999 Dodge Ram Truck. They describe experiencing uneven temperature control, with t...
Dodge HVAC air conditioning
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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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Buick Century 3.3L V6 Hesitation Issues Diagnosis
unknown Buick Century
The owner reports intermittent hesitation in their Buick Century 3.3L V6, occurring at various times, both cold and hot. They have replaced the IAC, T...
Buick Century hesitation
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AC Recirculation Issue in 2000 Toyota 4Runner
2000 Toyota 4Runner
The owner of a 2000 Toyota 4Runner reports that fresh air is continuously entering the cabin, even when the AC and fan are turned off, and the air is ...
Toyota 4Runner AC System
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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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2002 Oldsmobile Alero Heater Problem Diagnosis
2002 Oldsmobile Alero
The owner reports that the heater in their 2002 Oldsmobile Alero is not functioning properly. Initially, they suspected a heater core issue, but after...
Oldsmobile Alero heater
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Upper Ball Joint Replacement on Chevy G20 Van
1996-2002 Chevrolet G20
The owner reports that after lending their Chevy G20 van to a family member, they noticed the front passenger wheel appears bowed at the top, with a s...
Chevrolet G20 suspension
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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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Loud Thud Noise from 2007 Chevy Silverado 5.3L V8
2007 Chevrolet Silverado
The owner reports that their 2007 Chevy Silverado with a 5.3L V8 engine makes a loud thud or noise while idling. The noise seems to be coming from the...
Silverado 5.3L V8 engine noise
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1997 Ford Contour Overheating Diagnosis
1997 Ford Contour
The owner of a 1997 Ford Contour reported that after driving approximately 60 miles, they noticed coolant boiling when checking under the hood. A ther...
Ford Contour Overheating
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2000 Dodge Dakota A/C Intermittent Cooling Issue
2000 Dodge Dakota
The owner reports that the A/C in their 2000 Dodge Dakota blows cold air initially but then the cooling fades away after about 5-10 minutes of driving...
Dodge Dakota A/C
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