HVAC System Fault Analysis Cases
Detailed HVAC system diagnostics including air conditioning failures, heating system problems, and ventilation issues.
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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...
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1989 Toyota Corolla Cooling Fan Constantly On
1989 Toyota Corolla
The owner reports that the cooling fan is running constantly from the moment the engine starts, even when cold. Additionally, a check engine light has...
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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...
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1998 Chevy Suburban Rear Brakes Burning
1998 Chevrolet Suburban
The owner reports that the rear brakes of their 1998 Chevy Suburban keep burning and warping, leading to frequent replacements. In the past year alone...
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Diagnosing Coolant Leak in 1998 Chevy S-10
1998 Chevrolet S-10
The owner of a 1998 Chevy S-10 reports a significant coolant leak that has worsened over the past week. The leak originates from the middle of the eng...
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Coolant Leak into Throttle Body on 1999 Buick Park Avenue
1999 Buick Park Avenue
The vehicle owner reported coolant leaking from the throttle body, leading to rough engine operation. They noted previous repairs including the replac...
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1998 Audi A4 Overheating Diagnosis
1998 Audi A4
The owner of a 1998 Audi A4 reports that the vehicle is overheating despite having replaced the thermostat and temperature cooling sensor. They have a...
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1995 Isuzu Rodeo Blower Motor Diagnosis
1995 Isuzu Rodeo
The owner reports that the blower motor for the air conditioning system in their 1995 Isuzu Rodeo is not functioning. They have tested the circuit and...
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1996 Ford Escort Electric Fan Not Working
1996 Ford Escort
The owner reports that the electric cooling fan on their 1996 Ford Escort LX 1.9L is not functioning, leading to engine overheating issues. Previous r...
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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...
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2001 Mitsubishi Mirage Evaporator Replacement Guide
2001 Mitsubishi Mirage
The owner is attempting to replace the evaporator in a 2001 Mitsubishi Mirage. They have already removed the airbag, radio, and loosened the dash by f...
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Blower Motor Not Working Diagnosis
1995 Cadillac El Dorado
The owner of a 1995 Cadillac El Dorado with a V8 engine reports that the front blower motor is not functioning. They have attempted to replace the blo...
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Intermittent Rumble Noise from AC Engagement
2004 Chrysler Town and Country
The owner reports a rumbling noise when the air conditioner is engaged, primarily noticeable at idle or low speeds. The noise disappears when the vehi...
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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...
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2003 BMW Z4 Water Pump Replacement Diagnosis
2003 BMW Z4
The owner of a 2003 BMW Z4 is experiencing engine cooling issues, specifically related to the water pump. They have previously removed the entire cool...
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2001 Jeep Cherokee Heater Issues
2001 Jeep Cherokee
The owner of a 2001 Jeep Cherokee reports that the heater only blows cold air despite checking the blend doors, which are functioning correctly. They ...
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2001 Pontiac Grand Am Overheating and Fan Issues
2001 Pontiac Grand Am
The owner reports that their 2001 Pontiac Grand Am is overheating, and the engine fans are not operational. They've recently changed the oil and added...
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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...
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