![]() ![]() ![]() To fix the EPC light on a VW, we advise you to visit a local Volkswagen repair shop. The VW EPC warning light indicates a problem with the throttle pedal, throttle body, traction control, or cruise control. Under normal circumstances, your car should definitely have enough power to drive to the VW repair shop. When the EPC notification comes on in your Volkswagen dashboard, your car needs to be repaired as soon as possible. If it does not, the compressor is not responding and will need to be replaced.Fix the Volkswagen EPC light VW – Throttle body Now that you have manually given the AC compressor a command to turn on, it should turn on. ![]() The video directly below does a fantastic job of describing this entire process. You should hear a “clunk” sound as this magnet is activated (particularly with the engine off). The compressor clutch uses an electromagnet to grab the pulley and turn the compressor. But, first, you’ll need to locate the compressor relay. You can use a jump wire to determine if your Volkswagen Passat’s AC compressor clutch is activating properly. You can do this in under 2 minutes with a test light. The power going to the AC compressor relay is going to be fused, so check that fuse while you’re at it as well. If it looks good, it’s time to move on to testing the relay and seeing if you can manually get the compressor to turn on. Inspect the harness to make sure that it doesn’t have any opens or shorts. On the other hand, if it is turning freely, we need to determine why it’s not activating.īeing that the clutch compressor is just a few feet off of the road, it can accrue wiring damage over the years. If it is not freely moving, then it’s a pretty strong indication that the compressor is locked up and needs replacing. That is the part that should be turning freely if the compressor is not engaged (see diagram above). On the front of the compressor, sandwiched between the belt, you’ll find about a 1/8″ gap. You don’t want to turn the pulley where it is attached to the belt. Even with the key off, treat them like they can still come on. Obviously, you’d want to do this with the vehicle off. Your Passat’s AC compressor should freely turn by hand when it is not engaged. The AC compressor is getting a command to turn on but is no longer able to, which would indicate that it needs replacing. This indicates some form of wiring problem.Ģ. The clutch is not getting a signal to turn on. It could even be missing entirely without you noticing if it is an independent belt.Īfter inspecting the belt, there can only be two things left that could be happening:ġ. It may just be that the belt can’t turn the compressor anymore. Inspect the belt to see if it is cracked or shiny. If there are two belts, they’ll both be attached at the crank pulley. Or, it may be turned by an independent belt. Inspect Your Passat’s AC/Serpentine BeltĪs stated above, your Passat’s AC compressor may be turned by the serpentine belt that turns all of the engine accessories. Here’s how to about diagnosing why your AC is not turning on in your Volkswagen Passat:ġ. If that’s the case, jump to this article: Volkswagen Passat AC Not Blowing Cold. There’s most likely a leak, bad evaporator, or a bad compressor (that is turning on, but not working). ![]() If you hear a “thunk” or “clunk” noise after turning the AC on, the compressor is engaging. If this clutch doesn’t grab, the AC compressor will not turn on.īefore opening the hood to see if there is anything wrong with the AC compressor, start the Passat and turn the AC off and back on a few times. It uses a clutch to grab the pulley and cycle coolant through your Passat’s AC system. The AC compressor pulley is always being turned by either the serpentine belt or a dedicated belt (it’s going to depend on the model year and engine type). No matter where you live if your Volkswagen Passat’s AC compressor is not turning on, it can turn a pleasant commute into a nightmare (particularly if you have kids that are riding with you). ![]()
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