Passat (B5) :: 1999 1.8t - Power Is Kicking In And Out When AC Turned On


Jun 1, 2013

A couple of times since the weather has warmed up, a strange situation occurred with this car.

Turn on the a/c...interior cools off normally. After a while being on though...presumably when the motor is nice and hot...the engine starts acting weird. The temp gauge is right where its supposed to be, but here's the symptoms.

Press the throttle to speed up..and the motor slows down stumbles real bad. let up and it returns to pretty normal idle. if you floor it to get past the 'stumble zone' mostly it works right, but it feels like power is kicking in and out, to the point where you want to pull over because you're not sure if the car is safe to drive.

I'm talking stumble like the motor is about to kill. like its ignoring the input to open the throttle. This car has the hard wired throttle cable, so it can't be anything with an electronic throttle. If we drive around and never turn on the a/c....the symptoms do not occur.

What to check for this? No check engine lights on other than the typical abs lights.

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