ffirst the head lights, if i leave the switch in the auto position they will want to shut off and on, day or night!! i also hear a niose under the dash close to where my head light swicth is located whitch has a sound like a relay clicking. second the heater i have replaced the control unit and when i did the fan only worked on high. evertthing else works fine hot to cold and flow direction any suggesstions
We'll start with the heater. Your problem isn't the switch but the blower resistor which is located near the blower motor on the passenger side of the interior. If you can get yourself under the dash you'll see a few wires leading to a slim connector very close to the firewall. It is held in by two screws. It's a very easy fix and very, very common in GM cars. The headlight problem is either a relay or the switch itself. Call the dealer and ask if there is a separate relay for the Day/Night sensor, if so swap it our with one you know is good from within the fuse box. Since it only happens on auto it has to be related to that system, so if it isn't a relay then it's either the switch or the Day/Night sensor. Good luck.
The problem is your ignition switch. I had the exact same problem with 00 grand prix. Blower motor would only work on high (sometimes) and never on lower settings. and turning it to lower setting the headlights would go out. replaced ignition switch and all is well.
ok seems such as you have a foul a/c head unit. Which it particularly is the peace that has each and every of the a/c heater controls on it. I surely have a 2001 grand prix and that i melted on in it. in spite of the reality that it in no way did effect my headlights. i'm specific if there's a quick in it even with the undeniable fact that it o.k. probable ought to. Now for as your opposite lighting fixtures no longer working examine your bulbs first they do burn out. no longer probable annoying to ensure them actual person-friendly to get right of entry to from the trunk under the carpet. in the event that they or good it must be your impartial change is undesirable. wish this helps you alongside your way.