Cadillac Repair: In-car temperature is not working fine, grad celsius, aspirator

Question
HI
I got a '88 Fleetwood 4.5L FWD. I realized that the in-car temperature in my car is reacting pretty slowly. When it's hot outside and I set my temperature on the ECC the in-car temperature is going down very slowly. like one degree (Grad Celsius) in 5 minutes. I check that in my diagnostic. The AC keeps cooling although the in-car temperature has already reached the desired temperature or less. I check that with a seperate thermometer I'm holding in the car. The AC keeps cooling because the in-car temperature sensor is showing a temperature that is higher than the in-car temperature. I checked the sensor for itself and I got also a second one to compare both of them. Both are working the same. When I touch the sensor the diagnostic shows me immediately a rise of the temperature. When I blow to it the temp goes down pretty fast. The sensors should work fine then. I also checked the aspirator and the aspirator tubes/hoses. The airflow is good, no plugging. I really don't know what it could be. Thanks for any help. Romy

Answer
You will need simple electrical schematics, Test procedures and picture locations of the components within the system that is causing you problems of which can't be done on this website which only allows one picture. I do not have a website so you will have to e-mail: onlineautohelp@msn.com in order to obtain the information.