Heater won’t work from center vents

ANSWER : Hello and thank you for contacting YourMechanic. The issue is the blend doors are not adjusting correctly when you adjust the thermostatic switch. Check the wiring in the dash for any loose contacts to the blend doors. Also check the blend doors for any debris trapped in them causing them to stick on the tracks. If you need further assistance troubleshooting your vehicle, then seek out a technician, such as one from YourMechanic, that can assist you with the heater.

ANSWER : As unfortunate as it is, your vehicle would be considered flood damaged. Diagnosing electrical problems in a flood damaged vehicle is nearly impossible. This would take many hours or even days to determine which wiring harnesses and circuits have been affected. Then nearly all of the wiring under the dash would likely require replacement as well as many sensors and switches. On a BMW vehicle, the amount of wires and switches are likely more than that of a lower end vehicle. Due to the inefficiency in cost, you would likely be able to purchase another BMW like yours for less than what it would cost to fix your car. Many insurance companies would consider this type of damage to total out the vehicle unfortuantely.

ANSWER : I would first look at the diagnostic trouble codes. Those codes are available because the check engine light is on. If the fuel pump is not running (momentarily) at key on, that fault alone will prevent the car from starting as there will be no fuel pressure. Pump output and pressure can be directly tested and you can also check for electrical power to the pump. To find out why the engine will not run, the recommended diagnostic is a no start diagnostic. If you request that service, the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

ANSWER : Hi there. Sure would appear a lot is going on electrically all at once. This could be, a problem in the PDC (power distribution center). The PDC is typically located under the hood and contains numerous fuses and relays. I don’t believe any one fuse will resolve all of the electrical issues. There is a possibility, it is not a power supply issue. It may be, the result of a poor electrical ground common to the inoperative components. Proper circuit testing should be performed. This would confirm the cause of multiple electrical failures. I recommend having your vehicle’s electrical problems be diagnosed and repaired by a certified technician, such as one from YourMechanic.

ANSWER : The problem you are describing likely stems from an intermittent electrical fault in the wiper circuit. The windshield wiper system uses a small electric motor to move the wiper arms that you see on the windshield. That electric motor is controlled through a switch, relay, fuse, and wiring. One, or more, of those electrical components has failed although it is also possible that the mechanical arms are binding (seized, if the lubricant has dried out) thus causing the electric circuit to the motor to overload. Regardless of the underlying fault, if you request a non functioning wiper diagnostic/repair, the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

ANSWER : You possibly have a dead battery. Batteries that are "partly" dead can often still run lights, dash lights and so forth but will not have enough power to run the starter motor and start the car. The very first thing to do is be sure you have a fully, 100% charged battery that passes a load test. If the battery passes a load test be sure it is NOT a marginal pass in which case you should simply install a new battery to reduce diagnostic headaches. Batteries are a VERY important component in a car’s electrical system. Once you have a fully functioning, preferably new battery (fully charged before you leave the store), if the starting system still does not function, there are only a relatively limited number of causes. Broadly, either the starter motor/solenoid assembly is faulty or the electrical circuit supplying the motor has a fault. That circuit begins at the battery and includes grounds, wiring (some of which is very heavy cabling), fuses, relays, the ignition switch and terminations. Basically, the starter is either getting power or it isn’t. If the starter motor is getting power but it doesn’t work, the starter is condemned and replaced. Alternatively, if there is no power to the starter, then the starter circuit is traced until the fault in the circuit is found. Notably, faults can include high resistances, due to corrosion, wire strand breaks, or loose terminals, which can only be diagnosed using a voltage drop test. If you desire that a certified mechanic resolve this promptly, please simply request a no start diagnostic and the responding mechanic will get it diagnosed and repaired for you, including installing a new battery if required. Please let us know if you have further concerns or questions as we are always here to help you.

ANSWER : Having a poorly performing climate control system can be difficult. From what I’ve found, Nissans generally don’t have the best performing climate control when it comes to the heater. You’v stated that it can blow cold on one side and warm on the other. If you have dual zone climate controls, make sure they are set to the same temperature. If the climate zones are set the same, or you have a single zone climate control system, a trip to the dealer might be necessary to check the operation of the climate control and see if Technical Service Bulletin (TSB) NTB14-113 applies to your vehicle.

ANSWER : Using the wiring diagram from the factory service manual what you want to do is see if the gauges have either a common power source or a common ground. If they do, then basically you track down that circuit to find the interruption. Of course, that tracing may lead you to a common fuse or relay as well. If they all failed at the same time, there is a possibility of a unique failure point which, again, you have to track down using the wiring diagram. If no wiring fault is found, it is possible that the cluster is malfunctioning. If you want these steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an electrical component/circuit diagnostic and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.