HVAC System Fault Analysis Cases

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

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1997 Buick Park Avenue A/C and Heating Issue
1997 Buick Park Avenue
The owner of a 1997 Buick Park Avenue reports an issue with the air conditioning and heating system. The compressor activates, but no warm air is prod...
Buick Park Avenue Heater Core
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1989 Chrysler New Yorker Auto Temp A/C Issue
1989 Chrysler New Yorker
The owner reports that their 1989 Chrysler New Yorker is stuck in HEAT mode despite selecting the lowest temperature setting (65°F) on the Auto Temp c...
HVAC Auto Temp Control Chrysler New Yorker
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1999 Honda Accord AC Delay and Non-Engagement Issues
1999 Honda Accord
The owner reports that the air conditioning system in their 1999 Honda Accord takes 10-15 minutes to start blowing cool air and sometimes does not eng...
Honda AC system compressor engagement
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2000 Mitsubishi Diamante Heater Core Issue
2000 Mitsubishi Diamante
The owner reports that the heater core in their 2000 Mitsubishi Diamante was leaking antifreeze. A friend disconnected the heater hoses and used anoth...
Mitsubishi Diamante heating system overheating
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1999 Subaru Legacy Viscous Connector Troubleshooting
1999 Subaru Legacy
The owner of a 1999 Subaru Legacy is experiencing issues related to the viscous connector after a transmission replacement. They are unsure if the con...
Subaru viscous coupling drivetrain
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1998 Saturn SL1 Accelerator Issue Diagnosis
1998 Saturn SL1
The vehicle owner reports an issue with their 1998 Saturn SL1 where the accelerator seems unresponsive. They’ve noticed irregular idle behavior, and s...
Saturn SL1 throttle
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1998 Cadillac Catera Heater Issue Diagnosis
1998 Cadillac Catera
The owner of a 1998 Cadillac Catera is frustrated after spending $3,800 on repairs, only to find that the heater is not working. The technician claims...
Cadillac Catera heater issue
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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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1996 Audi A4 Heater System Bubble Issues
1996 Audi A4
The owner reports that their 1996 Audi A4 has persistent air bubbles in the heating system, which affects heater performance. They have replaced the r...
Audi heating system coolant
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Steering Shaft U-Joint Replacement Analysis
2000-2007 Ford Focus
The vehicle owner is inquiring about the possibility of replacing just the U-joint on the steering shaft that connects to the rack and pinion instead ...
steering replacement u-joint
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Engine Light and Heater Issues in Peugeot 307
2001-2008 Peugeot 307
The owner of a Peugeot 307 1.4 petrol reports that the engine management light began flashing upon purchase, indicating issues with the catalytic conv...
Peugeot 307 engine light
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Heater Hose Repair for 2000 Ford Windstar 3.8L
2000 Ford Windstar
The owner reported a heater core hose on their 2000 Ford Windstar 3.8L snapped off at the intake manifold. The hose connects to a 'T' behind the engin...
Ford Windstar heating system
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1997 Isuzu Rodeo Blower Motor and Resistor Issue
1997 Isuzu Rodeo
The owner reports that their 1997 Isuzu Rodeo is not blowing air from the HVAC system. Initially, the blower functioned poorly on lower settings, but ...
Isuzu Rodeo blower motor
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Toyota Sienna P0116 Code Diagnosis and Repair
2000 Toyota Sienna
The owner reports a P0116 code for their 2000 Toyota Sienna at 119,000 miles. The code indicates a coolant temperature sensor circuit range/performanc...
Toyota Sienna P0116
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Cooling Fan Not Engaging at Normal Temperatures
2012-2015 Ford Focus
The owner of a Ford Focus reports that the cooling fan is not activating as expected, particularly during idle or in traffic. Although it operates cor...
cooling_system fan_relay temperature_sensor
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Rear Heater Hose Removal for 1999 Chrysler Town & Country
1999 Chrysler Town & Country
The owner is attempting to remove the heater supply and return tubing for the rear heater on a 1999 Chrysler Town & Country with a 3.8L engine. The tu...
Chrysler Town & Country heating system
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ECM Replacement and Reprogramming Challenges
extracted_year Lexus extracted_model
The vehicle owner is experiencing multiple issues with their Lexus, ultimately determining that the ECM is faulty. They have acquired a used ECM onlin...
ECM reprogramming Lexus issues
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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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