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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1996 Honda Civic EJ6 Coolant Loss Diagnostics
1996 Honda Civic
The owner reports that their 1996 Honda Civic EJ6 is losing coolant despite replacing the head gasket, water pump, thermostat, and hoses. A pressure t...
coolant_leak head_gasket_failure engine_overheating
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No Heat in 1984 Oldsmobile Delta 88
1984 Oldsmobile Delta 88
The owner of a 1984 Oldsmobile Delta 88 reports that there is no heat coming from the heater, despite both hoses to the heater core feeling hot. The v...
Oldsmobile Delta 88 HVAC
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2005 Nissan X-Trail Smoke Through Air Vents
2005 Nissan X-Trail
The owner of a 2005 Nissan X-Trail reports that after running the vehicle for about 15 minutes, smoke or steam begins to come through the air vents, c...
Nissan X-Trail HVAC
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Overheating Issue Diagnosis for 1998 Pontiac Sunfire
1998 Pontiac Sunfire
Two days ago, while driving my 1998 Pontiac Sunfire, my girlfriend noticed the temperature gauge rising past the 3/4 mark, indicating the engine was o...
Pontiac Sunfire Overheating
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2001 Dodge Intrepid Cooling System Leak Diagnosis
2001 Dodge Intrepid
The owner reports a very slow leak in the cooling system, specifically around the water outlet with an air bleeder. The leak is causing crusting and d...
Dodge Intrepid cooling system
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Passenger Side Heater Malfunction Diagnosis
1995 BMW 740iL
The vehicle owner reports that there is no heat coming from the passenger side of their 1995 BMW 740iL. They mentioned that all controls for temperatu...
HVAC blend_door temperature_control
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2007 Hyundai Elantra A/C Not Cooling After Compressor Replacement
2007 Hyundai Elantra
The owner of a 2007 Hyundai Elantra is experiencing issues with the A/C system, which blows warm air instead of cold. After recharging the system and ...
A/C system compressor refrigerant issues
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2001 Saturn L200 Engine Coolant Leak Diagnosis
2001 Saturn L200
The owner reports a persistent issue with engine coolant leaking onto the passenger side floorboard of their 2001 Saturn L200. The leak occurs randoml...
coolant leak heating system Saturn L200
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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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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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1988 Ford Contour Overheating Diagnosis
1988 Ford Contour
The owner of the 1988 Ford Contour describes persistent overheating issues despite having the cooling fans confirmed as operational. They have already...
Ford Contour Overheating
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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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1995 Subaru Legacy New Axle Noise Diagnosis
1995 Subaru Legacy
The owner of a 1995 Subaru Legacy reports a new noise after replacing the axle and CV joint. The noise is described as pulsating and may vary with spe...
Subaru Legacy Axle Noise
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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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1986 Ford Bronco Coolant Leak Diagnosis
1986 Ford Bronco
The owner reports that their 1986 Ford Bronco, which has over 210,000 miles and is still running smoothly, is leaking coolant. They have maintained th...
coolant leak Ford Bronco 1986 model
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Head Gasket Replacement with Radiator - Fact or Fiction?
2000 Mazda 626
The vehicle owner reports that the radiator on their 2000 Mazda 626 needs replacement. The repair facility insists on replacing the head gaskets simul...
Mazda 626 overheating
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1985 Nissan Truck Overheating Under Load
1985 Nissan 720
The owner has a 1985 Nissan 720 pickup truck with 140,000 miles. The truck idles normally without overheating, but when put in gear, the temperature g...
Nissan 720 overheating
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