HVAC System Fault Analysis Cases

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

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2006 Buick La Crosse Water Sound Behind Dash
2006 Buick La Crosse
The owner reports hearing a water sloshing sound behind the dashboard when driving uphill, downhill, or turning sharply. This noise seems to originate...
Buick La Crosse water sound
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Screeching Noise from Air Conditioning Compressor
2005 Mitsubishi Magna
The owner reports a screeching noise coming from the air conditioning compressor, along with a slipping and screeching belt. This issue has been inter...
air_conditioning compressor_noise belt_slipping
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Radiator Fans Not Functioning on 2005 Suzuki Forenza
2005 Suzuki Forenza
The owner reports that the radiator fans on their 2005 Suzuki Forenza are not turning on, which is causing high pressure in the cooling system. They a...
Suzuki Forenza radiator fan
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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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2005 Nissan Frontier Dashboard Noises Diagnosis
2005 Nissan Frontier
The owner reports a loud ticking or knocking noise from the passenger side upon startup, lasting about 10 seconds. This noise occurs regardless of whe...
Nissan HVAC blower motor
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2007 Ford Mustang GT P0171 P0174 Diagnostic Analysis
2007 Ford Mustang GT
Ivan has a 2007 Mustang GT with persistent check engine light issues. Initially, codes P0171 and P0174 were retrieved, indicating a lean condition. He...
Ford Mustang P0171
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Understanding Cadillac Escalade BCM Functionality
2007 Cadillac Escalade
The vehicle owner is inquiring about the functionality of the Body Control Module (BCM) from a 2007 Cadillac Escalade for use in a retrofit project. T...
Cadillac BCM retrofitting
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Chevrolet Avalanche AC/Heater Noise Diagnosis
2010 Chevrolet Avalanche
The owner reports that the AC was functioning well until they stopped at a store. Upon restarting the vehicle, a loud rumbling noise emerged from the ...
HVAC blower_motor Chevrolet
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2007 Kia Rio Engine Fan Diagnostic Analysis
2007 Kia Rio
The owner recently had an oil change and noticed a slight vibration. Upon inspection, they found that one engine fan was intermittently spinning while...
Kia Rio fan
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Scraping Noise During Acceleration
2005 Kia Sedona
The vehicle owner reports a scraping noise coming from the front driver's side while accelerating. This noise does not occur when idling, but once the...
Kia Sedona scraping noise
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Repairing Driver Side Seat Warmer in 2005 Saturn Vue
2005 Saturn Vue
The owner reports that the driver side seat warmer in their 2005 Saturn Vue activates, as the indicator light comes on when switched on, but it does n...
seat warmer Saturn Vue 2005
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2008 Chevrolet Malibu Head Valve Diagnosis
2008 Chevrolet Malibu
The owner reports that their 2008 Chevrolet Malibu experiences engine warming issues while idling, particularly at red lights, leading to a mechanic's...
Chevrolet Malibu head valve
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2007 Chrysler Pacifica Overheating and Warning Lights
2007 Chrysler Pacifica
The owner reported that while driving their 2007 Chrysler Pacifica on a cold morning, the temperature gauge quickly shot to hot after about 4.5 miles ...
Chrysler Pacifica Overheating
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Thermostat Location for 2006 Volvo S40 T5 AWD
2006 Volvo S40
The vehicle owner reports a significant coolant leak every time the car is driven. A Volvo mechanic suggested that the thermostat is sticking and need...
Volvo S40 thermostat
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Cadillac Deville Heater Blowing Cold Air Diagnosis
1992 Cadillac Deville
The owner of a 1992 Cadillac Deville reports that the heater is blowing cold air, despite having replaced the thermostat and flushed the heater core. ...
Cadillac Deville Heater
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2006 Hyundai Tuscon Coolant Loss Diagnosis
2006 Hyundai Tuscon
The owner reports losing coolant even when the vehicle is not running. Two mechanics have inspected the vehicle, performing a pressure test that showe...
coolant_loss internal_leak heater_core
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2005 BMW 325i Cooling Fan Issue
2005 BMW 325i
The owner reports that after starting the car, the cooling fan begins to run within 10-15 minutes, accelerating to a loud noise reminiscent of an airp...
BMW cooling system fan noise
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1990 Chevy Van Overheating with No Heater Output
1990 Chevrolet Van
The owner reports that their 1990 Chevy Van is running hot and there is no hot air coming from the heater vents. Despite back flushing the system and ...
Chevrolet heating system thermostat
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