HVAC System Fault Analysis Cases

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

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1996 Jeep Cherokee Violent Shimmy at 55 MPH
1996 Jeep Cherokee
The owner reports that their 1996 Jeep Cherokee experiences a violent shimmy or shake at speeds around 55 mph. This issue began approximately three mo...
shimmy track bar suspension
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1998 Oldsmobile HVAC Panel Control Malfunction
1998 Oldsmobile Other Models
The owner reports that the HVAC system in their 1998 Oldsmobile is not functioning properly. While the air conditioning works fine, air only comes out...
HVAC Oldsmobile Actuator
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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...
Audi A4 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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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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1987 Honda Accord Sputtering and Shaking Symptoms
1987 Honda Accord
The owner reports that their 1987 Honda Accord sputters and shakes during acceleration, particularly when the A/C is on. This issue occurs intermitten...
Honda Accord Sputtering
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Ram HVAC Blend Door Actuator Ticking Noise Diagnosis
2010-2020 Dodge Ram
The owner reports a persistent ticking noise when the ignition is turned on, and sometimes even when the key is not in the ignition. They suspect a fa...
HVAC actuator blend door
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1998 Buick Century Low Air Flow from Vents
1998 Buick Century
The owner of a 1998 Buick Century with climate control reports low air flow from the vents regardless of the setting (windshield, floor, mid). While t...
HVAC cabin air filter blower motor
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1997 Pontiac Trans Am Heater Issue Diagnosis
1997 Pontiac Trans Am
The owner reports that the 1997 Pontiac Trans Am is not producing adequate heat. After replacing the thermostat and filling the coolant, the vehicle w...
heating_system thermostat blend_door
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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...
coolant_leak intake_manifold Buick
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2004 Cadillac Escalade EXT A/C Blend Door Issue
2004 Cadillac Escalade EXT
The owner of a 2004 Cadillac Escalade EXT reports an issue with the air conditioning system. While driving with the A/C on, heat unexpectedly starts b...
Cadillac Escalade EXT A/C system
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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...
Mitsubishi Mirage HVAC
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Heater Not Blowing Warm Air into Cabin
1996 GMC Safari
The owner of a 1996 GMC Safari reports that warm air is not blowing into the passenger compartment. They have already replaced the thermostat and vacu...
GMC Safari HVAC
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1985 Chevrolet S-10 4WD Vacuum Issue Diagnosis
1985 Chevrolet S-10
The owner replaced the actuator and vacuum line on their 1985 Chevrolet S-10 4WD, but now the truck remains stuck in 4WD. The only way to disengage 4W...
Chevrolet S-10 4WD
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1995 Ford Explorer HVAC Vent Control Issue
1995 Ford Explorer
The owner reports that the air conditioning system in their 1995 Ford Explorer is malfunctioning, as air is blowing out of the window and floor vents ...
HVAC vent control vacuum actuator
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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...
Chrysler Town and Country AC noise
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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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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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