HVAC System Fault Analysis Cases

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

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1991 Dodge Dakota Air Conditioning Blower Issue
1991 Dodge Dakota
The owner reports that the air conditioning blower stops working intermittently. Initially, it blows air but then ceases to function completely, leadi...
blower motor A/C system intermittent failure
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1992 Cadillac Seville Instrument Panel Malfunction
1992 Cadillac Seville
The owner reports that the instrument panel displays dashes (---) instead of readings for the fuel gauge, battery amp gauge, outside temperature gauge...
Cadillac Seville instrument panel
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1994 Dodge Intrepid Cooling Fan Not Activating
1994 Dodge Intrepid
The vehicle owner reports that the engine is overheating due to the cooling fan not activating. They have previously replaced the water pump and therm...
cooling_system fan_control engine_overheating
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1994 Saturn SL1 Overheating Diagnosis
1994 Saturn SL1
The owner reports that their 1994 Saturn SL1 is experiencing overheating issues. They are unsure if the radiator fan is functioning properly, as drivi...
Saturn SL1 overheating
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1994 Dodge Spirit Overheating Issue Diagnosis
1994 Dodge Spirit
The owner reported that their 1994 Dodge Spirit overheated while driving about 25 miles on the interstate. Upon arriving home, the temperature gauge i...
Dodge Spirit overheating
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1992 Ford Taurus Blower Motor Noise Diagnosis
1992 Ford Taurus
The owner reports that the blower motor in their 1992 Ford Taurus station wagon produces a very loud noise and strong vibration when turned on for hea...
blower motor noise HVAC system
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1994 Chevy Corsica Heater Blowing Cold Air
1994 Chevrolet Corsica
The vehicle owner reports that the heater was functioning properly in the morning but has now started blowing cold air. They also mention a squeaking ...
HVAC coolant_leak thermostat_failure
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1993 BMW 535i Overheating Diagnosis
1993 BMW 535i
The owner of a 1993 BMW 535i reports the vehicle started overheating, especially during winter. After flushing the radiator and removing the thermosta...
BMW overheating cooling_system
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1993 Ford Ranger Surging and Stumbling Issues
1993 Ford Ranger
The owner reports that their 1993 Ford Ranger experiences surging and stumbling when accelerating under 2000 RPM. They have already cleaned the thrott...
Ford Ranger surging
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2003 Pontiac Montana Transmission and Heater Issues
2003 Pontiac Montana
The owner reports intermittent issues with the transmission and heater in their 2003 Pontiac Montana. They experience a loss of acceleration when atte...
Pontiac Montana transmission issues
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1999 Oldsmobile Cutlass Overheating Issue Analysis
1999 Oldsmobile Cutlass
The owner recently acquired a 1999 Oldsmobile Cutlass and has been working on it with a neighbor. After changing the battery, they noticed the engine ...
Oldsmobile Cutlass overheating
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1998 Buick Regal Electrical System Diagnosis
1998 Buick Regal
The owner reports that their 1998 Buick Regal is experiencing multiple electrical issues, including non-functioning HVAC, cruise control, heated mirro...
Buick Regal electrical issues
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Chrysler Concorde Thermostat Replacement Challenges
1998 Chrysler Concorde
The owner of a 1998 Chrysler Concorde is attempting to replace the thermostat but is facing difficulties with the alternator removal. After significan...
Chrysler Concorde Thermostat
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1998 Pontiac Sunfire Blower Motor Diagnostic
1998 Pontiac Sunfire
The owner reports that the blower motor is not forcing air through the vents. They checked the fuse in the driver's door panel and replaced the relay ...
blower motor HVAC system relay
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Heater/AC Fan Not Working Diagnosis
2005 Dodge Dakota
The owner reports that the heater and AC fan in their 2005 Dodge Dakota suddenly stopped working after refueling. Prior to this incident, the fan was ...
Dodge Dakota blowermotor
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2001 Jaguar S-Type AC Not Blowing Cold Air
2001 Jaguar S-Type
The owner recently recharged the air conditioner in their 2001 Jaguar S-Type but now it is not blowing cold air. They mentioned that the compressor se...
Jaguar S-Type AC System
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4WD Not Engaging in Cold Weather
2003-2009 Hummer H2
The owner reports that their Hummer H2 has difficulty engaging the 4WD system, displaying a 'service 4wd' message when trying to switch to high or low...
Hummer 4WD transfer case
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2002 Ford Taurus V6 Air/Heater Surge Issue
2002 Ford Taurus
The owner reports that the 2002 Ford Taurus V6 runs well until the air conditioning or heater is turned on, causing the engine to surge while at a sto...
Ford Taurus V6
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