Air Conditioning Problems Analysis Cases

Analysis of AC system failures, cooling problems, and HVAC performance issues.

2008 Ford Fusion A/C Fan Noise Diagnosis
2006-2009 Ford Fusion
The owner reports a persistent noise under the dashboard of their 2008 Ford Fusion, which they suspect is related to the A/C or ventilation fan. The n...
HVAC Noise Diagnosis Blower Motor
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1997 Dodge Ram Idle Issues with Sensors and Vacuum
1997 Dodge Ram
The owner reports that their 1997 Dodge Ram will not hold an idle and runs sluggishly with knocking and pinging while driving. The engine dies when co...
Dodge Ram idle issues
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1996 Jeep Cherokee Violent Shimmy at 55 MPH
1996 Jeep Cherokee
The owner reports that their 1996 Jeep Cherokee experiences a violent shimmy or shake at speeds around 55 mph. This issue began approximately three mo...
shimmy track bar suspension
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Gas Gauge Malfunction Diagnosis for 1997 Cadillac STS
1997 Cadillac STS
The owner of a 1997 Cadillac STS with a 4.6L engine reports that the gas gauge is not functioning properly after replacing the fuel pump. They suspect...
fuel_system gauge_functionality wiring_issues
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1995 Pontiac Firebird Stalling and Idle Issues
1995 Pontiac Firebird
The owner reports that their 1995 Pontiac Firebird is experiencing stalling issues, especially while driving on the highway. After replacing the ignit...
Pontiac Firebird stalling
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1993 Cadillac El Dorado Cooling Fans and Blower Issues
1993 Cadillac El Dorado
The owner reports that the cooling fans and blower motor are not functioning under their own power. The driver seat also fails to operate independentl...
Cadillac El Dorado Cooling System
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1991 Ford Probe Rough Idle and Acceleration Issues
1991 Ford Probe
The owner reports that the 1991 Ford Probe idles roughly and can stall when in gear at a stop, but runs fine in park or neutral. When accelerating slo...
Ford Probe rough idle MAF sensor
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1993 Pontiac Grand Am Heater Not Blowing Air
1993 Pontiac Grand Am
The owner reports that the heater in their 1993 Pontiac Grand Am is not blowing air, despite the blower motor functioning properly. They have already ...
Pontiac Grand Am HVAC
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2007 Dodge Ram RPM Fluctuation with AC On
2007 Dodge Ram
The owner of a 2007 Dodge Ram with a 5.7L Hemi engine reports that when the AC is turned on, the RPMs fluctuate by about 200 RPM, oscillating up and d...
Dodge Ram RPM Fluctuation
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1996 Toyota Camry Backfiring Diagnosis
1996 Toyota Camry
The owner recently reassembled the engine after fixing the transmission. The car started backfiring, and while the timing belt is correctly installed,...
Toyota Camry backfire
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Chevy SSR Throttle Body Replacement Issues
2006 Chevy SSR
The owner replaced the throttle body and gasket on a 2006 Chevy SSR, restoring performance initially. However, the vehicle failed to start later on a ...
Chevy SSR throttle body
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1990 Honda Accord Stalled While Driving
1990 Honda Accord
The owner reported that their 1990 Honda Accord stalled while driving. The maintenance required light was flashing, and after pulling over, they were ...
Honda Accord Stalling
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1998 Chevy Lumina Rear Spark Plug Replacement Procedure
1998 Chevrolet Lumina
The owner is seeking guidance on replacing the rear spark plugs in a 1998 Chevy Lumina with a 3.1L engine. They have a Haynes Repair Manual that advis...
spark plugs engine maintenance 3.1L V6
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Hyundai Accent Poor MPG and Acceleration Issues
2002 Hyundai Accent
The owner reports their 2002 Hyundai Accent 1.6L automatic, with 103,000 miles, is experiencing terrible gas mileage, averaging about 20 MPG regardles...
Hyundai Accent fuel economy
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Saturn SL1 EGR Valve and Vacuum Leak Diagnostics
1994 Saturn SL1
The vehicle owner reports an intermittent check engine light that activates occasionally. Upon diagnostic checks, the vehicle was found to have troubl...
EGR valve vacuum leak troubleshooting
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1997 Pontiac Trans Am Heater Issue Diagnosis
1997 Pontiac Trans Am
The owner reports that the 1997 Pontiac Trans Am is not producing adequate heat. After replacing the thermostat and filling the coolant, the vehicle w...
heating_system thermostat blend_door
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2000 Hyundai Accent Engine Performance Issue
2000 Hyundai Accent
The owner of a 2000 Hyundai Accent reports that the vehicle frequently revs up unexpectedly, causing erratic engine performance. This issue tends to o...
Hyundai Accent Throttle Position Sensor
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1995 Pontiac Grand Prix Overheating Issue Diagnosis
1995 Pontiac Grand Prix
The owner reports that their 1995 Pontiac Grand Prix SE, which has a replacement engine with 60,000 miles, overheats after driving for 30-45 minutes. ...
Pontiac overheating cooling_system
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