Fan only works on highest speed. 2008 Volkswagen Passat

ANSWER : Hi there, thanks for writing in about your 2008 Volkswagen Passat. If the blower motor resistor and connector are good, then the only other thing that can cause the problem is the blower control switch or connector. Check the resistor to make sure you have good connections and that the resistor is not blown again. If you need help having this checked, a qualified professional from YourMechanic can come to your car’s location to inspect the cooling system and have this corrected.

ANSWER : The blower not working is most likely due to a fault with the blower resistor. When you go to high blower speeds the A/C may disengage the compressor if the cycling switch cycles or the high pressure switch gets over pressurized, shutting the compressor off. The first thing to do is to get the blower working correctly then test the A/C pressures using A/C gauges. If you’d like to get this fixed, consider YourMechanic, as a certified technician can diagnose your A/C issue and fix it accordingly. Good luck.

ANSWER : Hi there. It’s likely that the root source of your problem is an electrical relay or an electrical short somewhere in the system that is creating this problem. It’s incredibly difficult to pinpoint the source of this type of problem without being there to complete an onsite inspection, so it might be best to have a professional mobile mechanic come to your location and complete an AC not working inspection, to help you find the issue.

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. In both cases, when an AC system is not working and a warning light is coming on the dashboard, typically a professional mechanic will complete the same initial inspection, which is to download the stored error codes that triggered the warning light initially. This tends to give them an idea as to what is causing the problems. This could be something as simple as an electrical relay that is faulty or loose or an indication of a computer related "glitch". Either way, the best way to move forward is to have a professional mobile mechanic complete a check engine light inspection.

ANSWER : Hi there. There could be an issue with the electrical wiring to the fans from that connect to the coolant temperature sensor. Check the wiring for any loose connections or any corrosion that could keep the sensor from making a connection to the fans.

For the engine stalling only when hot, there could be an issue with the coil packs getting too hot. Check the condition of the coil packs and see if the harness is plugged in correctly. Make sure that the coil packs are mounted away from any additional heat source. If the coil is getting too hot, then the windings are expanding causing a break in the current making the coil stop generating a voltage making the engine stop running. When the coil cools down, the windings colaps and cause them to create the voltage needed to make a spark. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your stalling issue.

ANSWER : Hi there – the lack of slow or intermittent motor speed can be caused by 2 issues: failure of the switches on the steering column stalk, or within the motor pulse control inside the motor housing. You’re going to need a voltmeter to check power to the motor for low speed to isolate this one to either the motor or the switch. I recommend an electrical 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 : 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.