As I am not the original owner of this Alfa, it is vary likely that the previous owner swapped his from a unit from Europe without the auto option. I'll look into it and seeWhile the parts eper shows only one HVAC panel style for the 91-93 USA 164, maybe the B version doesn't have the auto option, as the others, L and S, have. If your car has it, it would be the left hand button, second row, in the HVAC panel.
I see that all the used panels for sale on eBay, etc, show an auto button, so don't know about any of the panels being from the B.
If the car has the auto mode, there should be an interior temperature sensor in the overhead panel above the windshield, ie, a little fan behind several air vent slots in the rear of the panel. Also, there should be a small temperature sensor either at the base of the windshield under the hood in the middle near the rear of the hood, or it may be a small bulb sticking out under the left hand outside driver's mirror.
Steve owned a B model, IIRC, so he would know for sure.
Maybe you will just have to buy a used panel. Easy to install.
Yes I checked the relay and it's fine. However one of the wires going to that relay plug is very worn and exposed. It's a pink wire.If relay located under that tall square black plastic cover behind false fire wall near blower motor is your problem , you can rob one off the same type 50 Amp radiator cooling fan relays from top radiator support under middle plastic cover to test a/c blower motor.
Yes I did and I also tried some newer relay spares I have from my Mercedes stash. Results were consistentpink goes to 86 (your low current control, or power input), not good is wire is exposed, as this is hot when HVAC switch is on. Did you swap in the relay from the radiator cooling fan as Steve says is the equivalent, to see if problem goes away?
I had been assuming that this would be the case the whole time, but wanted to single out other possible suspects. At this point it's worth just trying it and if it doesn't work ill just relist and get back to square one. Thank you guys for all the help. I'll report back with what I find.I'm beginning to think that the problem may the Q21a master control unit, as it's the unit that triggers the blower relay and also determines 0-1-2-3-4 fan speed, either automically or manually. You may be interested to know that one is currently up on ebay for $44 "buy it now", with "make offer" option. While it's a gamble it is certainly a gamble worth taking in my opinion.
Model: ALFA 164 SEDAN. We are here to serve you and are always more than happy to hear from you. Part Grade Abbreviations. cc = Credit Card size units. C = Greater than 200k miles. B = Greater than 60k miles and less than or equal to 200k miles but greater than 15k miles per year.www.ebay.com