High or Low Temperature Control Effort

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
DEFINITION: The temperature control operates with either too much or too little effort.
1	Were you sent here from Symptoms or another diagnostic table?	Go to Step 2	Go to Symptoms - HVAC Systems - Manual in HVAC Systems - Manual
2	Is one of the following a concern of the customer: The temperature control operates with little or no resistance. The HVAC outlet air temperature is constant, regardless of the temperature control setting. While driving the vehicle the temperature control setting changes. Does the temperature control operate too freely?	Go to Step 3	Go to Step 7
3	Idle the engine at normal operating temperature. Cycle the temperature control from the coldest setting to the warmest setting. Does the temperature change from cold to hot?	Go to Step 17	Go to Step 4
4	Inspect the connections of the temperature control cable. Is the temperature control cable disconnected from the temperature door?	Go to Step 15	Go to Step 5
5	Inspect the temperature control cable and linkage at the temperature door, while operating the temperature controls. Does the temperature door move while operating the temperature controls?	Go to Step 22	Go to Step 6
6	Inspect the cable casing while operating the temperature controls. Does the cable casing move, instead of the cable, while operating the temperature controls?	Go to Step 19	Go to Step 16
7	Inspect the HVAC control module for any debris or obstructions that would increase the effort to operate the temperature controls. Are there any obstructions?	Go to Step 21	Go to Step 8
8	Disconnect the temperature control cable from the temperature door. Operate the HVAC control module with the temperature control cable disconnected. Does the HVAC control module bind now?	Go to Step 10	Go to Step 9
9	With the temperature control cable disconnected: Manually operate the temperature door. Inspect the door for binding. Does the temperature door bind with the cable disconnected?	Go to Step 20	Go to Step 10
10	Disconnect the temperature control cable from the HVAC control assembly. Operate the HVAC control module with the cable disconnected. Does the HVAC control module bind now?	Go to Step 17	Go to Step 11
11	With the temperature control cable disconnected at both ends: Extend the cable in both directions. Inspect the cable for binding. Does the temperature control cable bind?	Go to Step 18	Go to Step 12
12	Inspect the temperature control cable for kinks or bends from incorrect routing. Repair the cable or routing as necessary. Does the temperature cable still bind?	Go to Step 18	Go to Step 13
13	Operate the HVAC control module with the temperature control cable disconnected. Does the HVAC control module bind now?	Go to Step 17	Go to Step 14
14	Assemble the temperature control system. Is the action complete?	Go to Step 22	-
15	Connect the temperature control cable to the temperature door linkage install the cable retainers. Is the action complete?	Go to Step 22	-
16	Repair the lack of heating or lack of cooling condition. Refer to Engine Fails To Reach Normal Operating Temperature . Is the action complete?	Go to Step 22	-
17	Replace the HVAC control module. Refer to HVAC Control Module Replacement in HVAC Systems - Manual. Is the repair complete?	Go to Step 22	-
18	Replace the temperature control cable. Refer to Temperature Control Cable Replacement in HVAC Systems - Manual. Is the repair complete?	Go to Step 22	-
19	Secure the temperature control cable casing. Is the action complete?	Go to Step 22	-
20	Repair the binding door. Is the repair complete?	Go to Step 22	-
21	Remove the debris. Is the action complete?	Go to Step 22	-
22	Operate the system in order to verify the repair. Did you find and correct the condition?	System OK	Go to Step 2