A/C only blows on setting 1,2,3,4. Not the highest setting. Heater only blows cold air as if it were still on A/C setting.
Nov 10, 2017 at 9:38 AM
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STEVE W.
CERTIFIED EXPERT
15,113 POSTS
With those issues it is either a failure of the HVAC control module or the Totally Integrated Power Module (TIPM) Those control all of the system.
To test them and find out where the issue is requires a dealer level scan tool to run specific tests. TIPM failures are very common. They are not a DIY item as they need to be configured to match the vehicle they are installed in using the scan tool.
Nov 11, 2017 at 7:16 AM
JJONIETZ
MEMBER
2 POSTS
SO I am guessing it is beyond just replacing the resistor?
Nov 14, 2017 at 1:27 PM
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STEVE W.
CERTIFIED EXPERT
15,113 POSTS
No resistor to replace. All of the parts are in those two units.