I went to auto zone to do diagnostic on my car because in the middle of traffic my car was overheating auto zone did the test and

ANSWER : The vehicle should not have been driven home with the engine overheating. It’s possible that you may have now blown a head gasket and damaged the engine. The fan relay connection, if it is melted, would be due to the fan motor overheating the circuit, and the cooling fan motor, relay and connector would need to be replaced. Since you overheated the engine until it blew the head gasket and warped or cracked the cylinder head, you may now have major engine damage to go with the fan problem.

ANSWER : There are reports that the replacement alternators will not communicate with the engine computer and will not charge correctly. I recommend using only the manufacturer approved replacement part. It can be new or remanufactured but approved for use in the vehicle. Some lower cost alternators on the aftermarket will have charging problems since they will not communicate with the ECM on the vehicle and will stop charging.

ANSWER : Hi there – you may have 2 related events here, a coolant leak, and a problem with the heater system. The current issue may be air inside the cooling system, which can cause overheating, and a lack of heater function. The lack of heater function could have 5 causes: the engine is not getting up to correct temperature (center of the gauge) due to a malfunctioning thermostat, the heater control valve is not letting hot coolant into the heater core, there is a restriction in the heater system that is preventing adequate hot coolant flow through the heater core, the heater fan is not working to transfer heat from the heater core to warm air for the passenger compartment, or the air blend doors inside the heater are not working properly to route warm air to the desired vents. I would recommend a heater system inspection](https://www.yourmechanic.com/services/heater-is-not-working-inspection) by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

ANSWER : Coolant leaks can occur because of cracked hoses, leaking gaskets, faulty water pumps, or damaged radiators. When the coolant level goes low, the engine will start to overheat due to the low coolant level. I would first recommend giving the cooling system a visual look over. If it is not obvious where the coolant leak is coming from, I would recommed having the cooling system pressure tested in order to determine the leak source. If you would like to have your cooling system pressure testedcoolant is leaking inspection, consider YourMechanic, as a certified technician can come to your home or office to inspect your cooling system.

ANSWER : Hello. From what you describe it would appear that the aftermarket alarm system may be having an issue. If the alarm has done this since it was installed then it may be possible that it is wired improperly, or that there is an issue with the alarm system control module. It may be possible that the two alarm systems are interfering with each other somehow, perhaps due to an issue with the transponders or remotes. I would recommend referring to the alarm system manufacturer, or the shop or technician that installed the alarm for more specific support or instructions.

ANSWER : Hi there. It is possible that you have a vacuum leak or perhaps the transmission mounts are loose, as usually these symptoms are common with worn out motor mounts. When the AC is activated, it does create additional drag on the motor, which can make a small vibration even worse. It’s probably a good idea to have a professional mechanic come to your location and try and replicate the symptoms you are describing by completing a car is shaking or vibrating inspection.

ANSWER : It sounds like you may have a cooling fan not working. The cooling fan draws air across the radiator to lower the temperature of the coolant. This occurs at a specific temperature and a fan switch, usually on the radiator, turns the fan(s) on when the coolant temperature reaches that threshold. When the car is moving, the fans are not needed as air flows across the radiator due to the movement. When you’re moving slowly or at a stop, the vehicle needs the fans to be operational to prevent overheating. If the fans are not coming on, the temperature of the coolant continues to rise until the vehicle ultimately overheats.

The root cause of the problem could be as simple as a fuse/relay, or it could be a fan switch, fan motor(s), or a wire harness issue. A quick visual inspection of the fuse can determine if that is the cause. Also, a check for battery voltage at the fan motors with the engine running and warmed up can determine if you have a fan motor inoperative. If there is battery voltage and good ground for the fan motors when the engine is hot, then the electrical system is operating properly and the fan motor is the culprit. I strongly recommend an experienced technician aid in diagnosing to prevent the replacement of unneeded parts. YourMechanic has several available technicians that can assist you with finding the cause of the car overheating issue, and provide an estimate and direction of repair.

ANSWER : Hi there. What had happened is the wrong key set the security to the vehicle. This is to prevent the vehicle from starting with the wrong keys. Try removing the battery cables (+) and (-) for 13 minutes. During that time, put the original key in the ignition and turn it on. Activate everything in the car even though there is no power. Then remove the key and hook up the battery cables. The computer should have reset and reset the security. If the security is still being tripped, then I recommend seeking out a professional, such as one from Your Mechanic, to help you