HVAC System Fault Analysis Cases

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

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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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AC Compressor and Cooling Fan Issues
1997 Pontiac Grand Prix GT
The owner of a 1997 Pontiac Grand Prix GT with 143,000 miles reports that the engine temperature gauge climbs to 220°F when stopped, prompting them to...
Pontiac Grand Prix Cooling System
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Air Only Blows Out of Defrost Vents
2000 Ford Excursion
The owner of a 2000 Ford Excursion with 38,000 miles reports that after parking the vehicle for winter, the air only blows out of the defrost vents in...
HVAC vacuum system actuator failure
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2009 Pontiac G6 Stereo Wattage Inquiry
2009 Pontiac G6
The owner of a 2009 Pontiac G6 is curious about the wattage output of the stock 6-disc changer, particularly if it’s worth keeping the stock system or...
Pontiac G6 audio system
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2008 Dodge Avenger Rear Indicator Bulb Replacement
2008 Dodge Avenger
The vehicle owner is trying to replace the rear indicator bulb on their 2008 Dodge Avenger. They have removed two plastic wing nuts found in the trunk...
Dodge Avenger rear indicator
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2007 Chevy HHR Turn Signal Lever Replacement
2007 Chevrolet HHR
The owner of a 2007 Chevy HHR has snapped off the plastic turn signal lever about an inch from the end, leaving it connected only by internal wiring. ...
turn signal lever multifunction switch steering column
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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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2005 Toyota Corolla A/C Blows Warm at Idle
2005 Toyota Corolla
The owner reports that the air conditioning system in their 2005 Toyota Corolla functions properly while driving but begins to blow warm air when comi...
A/C System Refrigerant Level Cooling Fan
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Cooling Fan Malfunction Analysis for 2005 Chevrolet Optra
2005 Chevrolet Optra
The owner of a 2005 Chevrolet Optra 1.6 A/T reports that the engine cooling fan does not operate when the AC is off. However, both fans run when the A...
cooling_system AC_system temperature_sensor
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Diagnosing Overheating Issues in 1997 Acura Integra
1997 Acura Integra
The owner of a 1997 Acura Integra reports overheating issues despite having replaced the thermostat in August 2010. Recently, they observed coolant ci...
thermostat overheating cooling_system
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2005 Dodge Ram Running Hot and Rough
2005 Dodge Ram
The owner reports that their 2005 Dodge Ram is running hot and rough. The check engine light is on, and AutoZone diagnosed a misfire on cylinder #5. T...
Dodge Ram overheating misfire
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2005 Chevy Trailblazer Blower Motor Cuts Out At Max Setting
2005 Chevrolet Trailblazer
The owner reports that after replacing the blower motor resistor and its connector, the blower motor now cuts out at the maximum setting (5). Initiall...
blower motor HVAC system relay issues
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