NickMues

if I turn temp down to 85 or less, the air comes out at an ambient temperature.
Anyone run into this or have any ideas?

Patsgarage

Check to see if the blend door is closing below 90*, if so it may be the programmer.

jv9999

I would guess temp sensor, but the controller has self-diag features if you google it.

NickMues

update: now it's working!
one thing I noticed, when it was not working the temperature selections where incrementing / decrementing by 5 degrees at a time (75, 80, 85, 90 etc).
now that it's working, they inc / dec by 1 degree at a time (75, 76, 77 ...).

bcrich1975

I would love to hear about an actual solution to this! My car is freeze or burn. There is no in between. A/C works fine @ lowest temp setting. Will also blow cool ambient temp. air at that setting. Can only get heat if set to 90 degrees. If I try to shoot for a comfortable temp like 72, cold is the only option. There is no in between. Wish I knew what part to go after. I've done all the rudimentary tests. Zero trouble codes in A/C controller (elec.) and have observed blend door movement as normal. I literally keep my hand perched on the shifter to turn heat on and off every few minutes to be my own form of actual temp. control. Incredibly annoying. (Car is a 92 base w/ elec. climate control)

mbooch

I also have this issue on my 96. In my car the heater core was recently replaced so I'm assuming it's not that. I also can get heat but only when I turn it all the way up and it's not really that hot. AC works fine. I did not notice the 5 degree increment until you get to the extents of the temp settings.
I'm going to try the blend door next. It appears that the blend door can cause it to only blow cold (no heat) or blow hot (no AC). I found this post that midway down mwm1993 shows how to visualize whether the door is moving before you replace it:
https://www.corvetteforum.com/forums...-corvette.html

Oklahoma Adam

I have the same problem with my 1990.