Hello,

I noticed that occasionally when I start my Grand Prix 1998 the external temperature reading shows low or negative numbers, e.g. -29F, even if the temperature is over 100F outside. This seems to cause A/C to blow warm/hot air since it thinks that temperature outside is cool enough and doesn't need additional cooling.

When I start driving the car and reach and maintain the speed of 65 mph or higher the temperature reading starts climbing and in a couple of minutes A/C starts blowing cold. I can achieve the same effect by cracking the driver and passenger windows open.

Online I found another complaint about a similar problem and the recommendation was to change temperature sensor. So, I changed the temperature sensor but that didn't fix the problem.

Any thoughts on this?

Thanks,

Alec