Yes, I mean the one behind the glove box on passenger side (its called a blower resistor).
Got it. NOW - do you really have the solid state blower speed control module that costs $80-100 that goes with the automatic/digital HVAC control system with rotary knob temp control like this
View attachment 16695
or you have the cheaper $30-40 resistor pack that goes with the manual HVAC controls that have up/down temperature sliders?
View attachment 16694
You say you have the automatic system, but the proper speed control module for that does not have 7 wires. Only the manual system has seven wires.
History: when it went out in July, we went to our dealer to buy the replacement resistor. They said that part had been replaced with a different one. Problem was that the old one had seven prongs, the replacement had five.
The dealer is a goofball, or something else is weird here. See my question above.
We had to do some splicing and get it connected.
Where did the instructions come from?
It worked, but our car surged and would die at idle if the air cond was used.
That's a simple issue, and (as odd as it may sound) involves a $5 cleaning of your throttle body. Nothing directly connected to the HVAC system except the idle can't stay constant when the AC compressor cycles on and off. It's a sticky throttle body problem.
We took it to a mechanic and he fixed the wiring and the car wouldn't die anymore.
What exactly did he fix? Did it also involve a throttle body cleaning?
However, the fan stopped going on sometimes. It would have to be in low or off when car started to get it to work.
Depends on the exact nature of the miswiring.
Last week it wouldn't work at all. So, we went online to buy another blower resistor on Saturday - found that Advanced Auto had the replacement for our Envoy that had seven prongs like the one that came with the vehicle.
That would be because you have the manual, not the automatic, HVAC system.
So we had to buy a pig tail to get it back to original manner. Problem was there were 7 colored wires, 3 small black. One of the colors (green) didn't match the instructions online (which said there would be a blue wire).
Can you post a link to these on-line instructions? Might clear up a lot. I know about a 7-wire connector, but not another one nearby with 3 black.
We used the green where the blue would go. We are guessing its a wiring issue
As an electrical engineer with a 38 year career, I can assure you that guessing is bad.
- the car is fully loaded with every option you would want, which is a curse if you have electrical issues.
Do you have the rotary temp controls or the up/down sliders?
We do not own anything to check currents. Is this easy and is this something that could be purchased at a retail store since it's Sunday night? Such as Walmart?
Walmart, and any auto parts stores, have them. Harbor Freight has some real cheapies that are good for a first timer. But let's figure out what kind of system you have first.
Thank you for any assistance!
PS forgot to say that everything looked fine with the resistor that we took out that had been replaced in July. It didn't have condensation or any melting or signs of issues.
Here are pictures of the three various possible modules.
Manual module. 7 wires input, 2 wires output to the blower
View attachment 16690
Same one, different view
View attachment 16691
Automatic module. 3 wire control input, 2 wires output to the blower. Old and new style
View attachment 16693
Automatic module (newest style). 5 wire connector harness. 3 still used for inputs, 2 for outputs
View attachment 16692