On the 90' Formula, the heat doesn't work. By this, I mean that the air blows out normally at all the vents on all the different settings but there is no heat. It appears that the "temporature slider" doesn't seem to work since cold air only blows out of the vents and it takes very little effort to move it from side to side when it used to require more effort. I opened up the dash to look inside and everything seemed to be plugged in and working properly. I noticed the mechanism that the slider controls but it goes into the firewall and I didn't notice, nor did I see, any problems. What could this be? Thank you very much.

 

i am having a similar problem. i have the push button controls and a slider and just yesterday i slid to heat and still got cold. i am guessing we are going to have a time getting answers though. if i find out anything i'll post you back.

 

I fixed the problem. All I did was mess with some of the hoses and the electrical connection under the hood, and that solved the problem. I wish I had a more definate answer but that is all I did.