Hello everyone, this is my first post.

Not too long ago, I did some work on my 1993 Cutlass Supreme Convertible that got the Electronic Climate Control back into an operational state.

The problem is that the PO removed the motor from the heater blend door actuator arm over the summer and moved the arm to full cold. Well, this was great for summer, but it'* colder now. He kept the old part so I would have something for a reference when replacing it.

I ordered the replacement from rockauto.com and attempted to install it a couple of days ago. I dialed the temp up to 90, watched the motor move, then opened the blend door , then put the motor on the arm and fastened it down. That was one of the most PITA jobs I've ever done on a car... The motor appeared to be responding to input from the ECC control panel, so I didn't give it much thought after I was done.

The problem now is that it seems to get stuck on heat. It was cooler that nite, so I dialed in a little heat. When I tried to turn the heat down, nothing happened. It was like it had gone to full-on, boiling hot heat. I even pushed the Cooler button all the way down to 60, and the fans came on full speed and blew nothing but extremely hot heat.

Since then, I've tried taking the ELEC 15amp fuse out, unplugging the motor, replacing the fuse, re-plugging the motor, and starting the car. The EEC will start back up set to 75deg, but once again, boiling hot air comes out of the vents regardless of temperature.

Today, I tried disconnecting the battery and unplugging the motor. Someone told me that reconnecting the battery causes the motor and the blend door arm to go through a synchronizing process. Well, there was a change, but it went all the way to full cold and stayed there regardless of the temperature setting.

Entering diagnostic mode by pressing Outside Temp and BiLevel at the same time shows a code of 00. When the motor'* unplugged, it will show code 00, then code 05.

What have I done, or not done, that was wrong? I know it'* installed in the right direction cause it will only fit one way. This is getting frustrating, and I'm hoping that these experiments haven't broken the new motor in some way.

Any advice or suggestions would be appreciated.

Thank you,
-Bill

What is code 5 ?

Is there a way to watch the moter turn? If its turning and the door not moving, there'* a problem.

Some guess'*
door is off
door axel broken
moter not working
moter broken (gear inside)

These kind of problems are usally related to Fords, you might get some insight by watching the videos over at heater treater.com

Since you can display the codes through the use of the climate controls, I'll assume that this has an electronic climate control. Not having worked on the exact model you have, I can't say for certain if this holds true in your case. But from what you've said, I suspect that either the climate control, or the body control module, (aka, the convenience center) has a problem.

I've had problems with this type of system in the past, but mostly the problem was the switching of the AC from the dash outlet to the floor outlet whenever the engine was under a load, such as when climbing a steep grade.

If the motor is vacuum operated, the controller manifold might be leaking, but if the motor is electric, it could be the BCM.

Just a thought.

Code 05= air temp valve control circuit.

I figured out that I'd been trying to install the actuator onto the flap arm the wrong way. A little fiddling, and I got it on correctly. This *almost* solved the problem. The actuator responded to input from the ECC control panel.

But while driving earlier this evening, it seemed stuck on hot. So, I did the diagnostic thing, and got a code 105, which is the intermittent air temp valve motor circuit fault.

Trying to decide if this warrants checking the wiring in the area of the control panel. Someone did some really bad stuff in that area when they installed a fancy radio, amp, and sub. My attempt to put everything back to rights might have resulted in a less than ideal connection.

But it seems as though I'm on the right track.

Thanks, y'all

Hi, I just purchased a 1993 Oldsmobile Cutlass supreme convertible from a previous owner. I am also having issues with the electronic climate control. Air is blowing from the vents however its cold air. I changed the thermostat and changed the water. I need to know where the heater blend door or the heater blend door actuator arm is located?
Thanks

Ok, this isn't the easiest thing to explain, and it might help you to buy a copy of the FSM on ebay.

To find the blend door actuator arm, first remove the large trim panel under the dash on the passenger side of the car. Once that'* out of the way, you'll be able to see an electrical box, and above it a smaller box with colored tubes running in and out of it. That is the vacuum actuator for the climate control. The blend door motor is an assembly mounted roughly beside and above those two items. You can tell what it is because it has a four-wire connection running out of it. You'll have to remove the electrical box and the vacuum actuator before you can remove the blend door actuator. The blend door actuator attaches at its top to the blend door arm.