HVAC System Fault Analysis Cases

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

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Cooling Fans Run Continuously on 1994 Acura Legend
1994 Acura Legend
The cooling fans on my 1994 Acura Legend start running at high speed as soon as I turn the key to the ON position, even before starting the engine. Th...
Acura Legend Cooling Fans
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1994 Dodge Shadow Overheating Diagnosis
1994 Dodge Shadow
The owner of a 1994 Dodge Shadow with a 2.5L engine reports intermittent overheating issues that have persisted for about three years. The problem occ...
Dodge Shadow overheating
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1993 Lincoln Mark VIII Rack and Pinion Specs Inquiry
1993 Lincoln Mark VIII
The owner is seeking the spine count and teeth count for the rack and pinion of a 1993 Lincoln Mark VIII. They plan to install this component on a 195...
Lincoln Mark VIII rack and pinion steering column
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1991 Buick Park Avenue Cooling Fan Diagnostics
1991 Buick Park Avenue
The owner reports that the cooling fan for the radiator is not operating correctly, leading to overheating issues during driving, especially when the ...
Buick cooling system radiator fan
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Cooling Fan Delay Issue in 1991 Honda Accord
1991 Honda Accord
The owner reports that the cooling fans in their 1991 Honda Accord are functioning but engage too late when the engine is running. The fans do eventua...
cooling_system temperature_sensors Honda_Accord
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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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1993 Honda Prelude Cooling Fan Diagnosis
1992-1993 Honda Prelude
The owner reports that the radiator cooling fan is continuously running, regardless of whether the air conditioning or heater is in use. The fan remai...
Honda Prelude Cooling Fan
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Intermittent Temperature Gauge Fluctuation on Chevy P30
1990 Chevrolet P30
The owner of a 1990 Chevrolet P30 Airstream RV reports intermittent fluctuations in the temperature gauge, rising to about 2/3 but never overheating. ...
temperature gauge cooling system Chevrolet P30
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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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Vacuum Hose Diagram Request for 2002 KIA Sportage
2002 KIA Sportage
The owner of a 2002 KIA Sportage 4x4 with an automatic transmission has recently replaced the hood, resulting in the loss of the vacuum hose diagram. ...
KIA Sportage vacuum hoses
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Saturn Outlook Overheating After PCM Replacement
2007-2010 Saturn Outlook
The owner experienced overheating issues after taking the Saturn Outlook to the dealership for a transmission shifting problem. The service technician...
Saturn cooling system overheating
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1996 Dodge Caravan AC Not Blowing Cold Air
1996 Dodge Caravan
The owner reports that the AC in their 1996 Dodge Caravan has never blown cold air since purchasing the vehicle. Recently, they attempted to fix the i...
Dodge Caravan AC
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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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1998 Saturn SW2 Running Hot Diagnosis
1998 Saturn SW2
The owner reports that the 1998 Saturn SW2 is running hot, particularly when idling or stopped at traffic lights. The owner checked the fan fuses and ...
Saturn SW2 cooling system
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Blower Resistor Location and Diagnostic Insights
2000 Saturn LW1
The vehicle owner is experiencing issues with the blower motor not functioning properly. They have sought guidance on the location of the blower resis...
blower_resistor HVAC_system Saturn_LW1
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Air Conditioning System Failure Diagnosis
2000 Dodge Caravan
The owner reports that the air conditioner in their 2000 Dodge Caravan suddenly stopped working. Initially, it was blowing cold air, but now it does n...
Dodge Caravan AC System
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2004 Chevy Tahoe 4WD Actuator Diagnostic
2004 Chevrolet Tahoe
The owner reports intermittent 'service 4WD' light activation on their 2004 Chevy Tahoe. The 4WD system sometimes works, but often it won’t engage whe...
Chevrolet Tahoe 4WD
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1999 Dodge Caravan Intermittent Knocking Noise Diagnosis
1999 Dodge Caravan
The owner reports a knocking noise coming from the engine of their 1999 Dodge Caravan with a 3.0L V6 engine and 113,933 miles. The vehicle was recentl...
Dodge Caravan knocking noise
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