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Ron
Ron, ASE Certified Technician
Category: Cadillac
Satisfied Customers: 33460
Experience:  34 year as an ASE Tech
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Heat works perfectly on driver side but on passenger side it

Customer Question

Heat works perfectly on driver side but on passenger side it has to be on 90 to get some heat
JA: Have you checked the coolant level? Has there been any leaking from the hoses?
Customer: No leaks
JA: What is the model of your '90 Cadillac?
Customer: 2005 sts
JA: Are you fixing your STS yourself? What have you tried so far?
Customer: Nothin
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 20 days ago.
Category: Cadillac
Expert:  Ron replied 20 days ago.

Hello. My name is ***** ***** I am happy to assist you today. Give me just a moment to review your post, and I'll be right back with the help you need.

Expert:  Ron replied 20 days ago.

Your 2005 has to blend door actuators, one on the LH side and on on the RH side and the common cause for the type of problem you are having is in most cases caused by a failing RH side blend door actuator. You can test this by removing the actuator and closing the blend door by hand and see if the heat returns. See the Actuator location in the link below.

https://dl.dropboxusercontent.com/u/104923897/Blend%20door%20RH%20Nove%2018.pdf