9th generation of Chevrolet's full sized SUV, based on the GM GT800 platform.

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Only one hose that goes to the heater core is hot and not getting any

Why is my suburban is not getting any heat I flush the heater core and still nothing change the thermostat and still the same and only one hose is hot

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@razer1318 when you opened the system and changed the fluid did you bleed the system . It sounds like you have a air lock in the heater core. follow this video to bleed the system . It also helps to turn the heater on high without the fan and also to raise the front end of the vehicle to help with moving the coolant through the engine. Repeatedly squeezing the rad hose also helps to push out air. Hope this helps

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@razer1318 check your heater hoses and make sure they are not blocked and check where the hoses connect to ensure they are properly installed.

From the manual:

HEATING SYSTEM PERFORMANCE

WARNING: Avoid contact with moving parts and hot surfaces while working around a running engine in order to prevent physical injury.

1. Were you sent here from Too Cold in Vehicle? If so, go to next step. If not, go to TEST N: TOO COLD IN VEHICLE under SYMPTOM TESTS.

2. Start the engine. Allow the engine to idle. Does the engine reach a normal operating temperature? If so, go to next step. If not, go to step 9 .

3. Allow to idle. Select the FLOOR mode. Select the minimum blower speed. Select the maximum temperature setting. Feel the temperature of the inlet and outlet hoses at the heater core. Does the inlet hose feel warmer than the outlet hose? If so, go to step 7 . If not, go to next step.

4. Install a thermometer into the I/P center air outlet. Secure a thermometer to the heater core outlet hose. Select the PANEL mode. Select the maximum blower speed. Select the maximum temperature setting. Record the temperature at the I/P center air outlet and the heater core outlet hose. Compare the recorded temperatures.

Are the temperatures similar? If so, go to next step. If not, go to step 6 .

5. Inspect and repair the cowl, the recirculation door and the heater/vent module case for cold air leaks. Perform the necessary repairs. After the repairs are complete, go to step 1 0 .

6. On Avalanche, Escalade, Suburban, Tahoe & Yukon: Start the engine and allow to idle. Depress the mode control button until the LOWER position is displayed. Select the lowest blower speed position. Turn the temperature control knob to the maximum hot position. Check the temperature of the heater inlet and outlet hoses by feel. (The air temperature around the hoses must be at least 85°F (24 °C). Does the heater inlet hose feel warm and the heater outlet hose feel cold? Go to step 10 .

On 3500 HD, Cab & Chassis, Sierra & Silverado: Inspect the temperature door operation. See SYMPTOM DIAGNOSIS under TROUBLE SHOOTING. Perform any necessary repairs. After repairs are complete, go to step 10 .

7. Turn engine off Backflush the heater core. Start the engine. Select the FLOOR mode. Select the minimum blower speed. Select the maximum temperature setting. Feel the temperature of the inlet and outlet hoses at the heater core. Does the inlet hose feel warmer than the outlet hose? If so, go to next step. If not, go to step 10.

8. Replace the heater core. After repairs are complete, go to step 10 .

9. Repair the cause of low engine temperature concern. After the repairs are complete, go to next step.

10. Operate the system in order to verity the repair. Does the system operate correctly? If so, system is okay. If not, go to step 2 .

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