HVAC System Fault Analysis Cases

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

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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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HVAC System Temperature Control Issue
1998 Lincoln Navigator
The owner reports that when the A/C is turned on in their 1998 Lincoln Navigator, it cools down quickly but then the air becomes warm to hot after a f...
HVAC Blend Door Actuator Temperature Control
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2000 Mitsubishi Montero Overheating Diagnosis
2000 Mitsubishi Montero
The owner reports that their 2000 Mitsubishi Montero is overheating despite having replaced the thermostat and fan clutch. They attempted to bleed the...
Mitsubishi Montero overheating
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2001 Subaru Impreza AC Fan Low Air Flow Issue
2001 Subaru Impreza
The owner reports low airflow from the air conditioning fan in their 2001 Subaru Impreza. Although the fan operates at all speed levels, the air volum...
Subaru Impreza HVAC
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2003 Chevy Monte Carlo Climate Control Not Functioning
2003 Chevrolet Monte Carlo
The owner of a 2003 Chevy Monte Carlo SS reports an A/C issue where the driver's side blows hot air while the passenger side emits slightly cool air. ...
Chevrolet Monte Carlo A/C System
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Cooling Fan Wiring Issue Diagnosis
2004 Pontiac Grand Am
The owner of a 2004 Pontiac Grand Am is experiencing cooling fan issues. The purple wire connected to the cooling fan appears to be improperly attache...
Pontiac Grand Am cooling fan
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1999 Kia Sportage Engine Cooling Problem Diagnosis
1999 Kia Sportage
The owner of a 1999 Kia Sportage is experiencing engine cooling issues, particularly suspecting a malfunctioning temperature sending unit and possible...
Kia Sportage cooling system
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2002 Oldsmobile Alero Heater Problem Diagnosis
2002 Oldsmobile Alero
The owner reports that the heater in their 2002 Oldsmobile Alero is not functioning properly. Initially, they suspected a heater core issue, but after...
Oldsmobile Alero heater
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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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2000 Jeep Cherokee Overheating Diagnosis
2000 Jeep Cherokee
The owner of a 2000 Jeep Cherokee reports that despite replacing the radiator, hoses, thermostat, water pump, and electric fan, the engine temperature...
Jeep Cherokee overheating
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2004 Chevy Blazer Antifreeze Smell Diagnosis
2004 Chevrolet Blazer
The owner of a 2004 Chevy Blazer reports smelling antifreeze through the vents. A previous diagnostic inspection found no issues, suggesting a new rad...
Chevy Blazer heater core
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2002 Honda Civic Heater Acting Up
2002 Honda Civic
The owner of a 2002 Honda Civic EX reports that the heater is slow to produce heat, even when the engine is warm. They have performed a complete coola...
Honda Civic heater issues
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2000 Ford Escort Thermostat and A/C Issues Diagnosis
2000 Ford Escort
The owner reported that the air conditioning is not working effectively, especially when the outside temperature rises. They mentioned that the thermo...
thermostat air conditioning Ford Escort
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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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1998 GMC Jimmy Air Conditioning Not Working
1998 GMC Jimmy
The owner reports that the air conditioning system is not functioning properly, as the vents only blow hot air regardless of the settings. Previously,...
GMC HVAC AC issues
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1989 Volkswagen Jetta Coolant Temp Gauge Inop
1989 Volkswagen Jetta
The vehicle owner reported that the coolant temperature gauge on their 1989 Volkswagen Jetta is inoperative. They mentioned that they replaced the pri...
Volkswagen Jetta coolant temperature gauge
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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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2002 Oldsmobile Silhouette Overheating Issues
2002 Oldsmobile Silhouette
The owner reports that their 2002 Oldsmobile Silhouette is experiencing overheating issues. The vehicle's cooling fans are functioning correctly, and ...
Oldsmobile Silhouette overheating
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