heater problem (recently replaced rad and water pump)
Thread Starter
|
Professional
Joined: Jun 2005
Posts: 204
Likes: 0
From:
RE: heater problem (recently replaced rad and water pump)
ORIGINAL: SeVeReDiStOrTiOn
Doubt it's the heater core....notice any dampness on the passenger side floor or smell antifreeze? EDIT:What year is your truck and have you ever flushed the system?
I still think it's the mixer door...i'd look into it more if I were you. You usually won't hear the mixer when changing the temp....the routing doors you will though.
Doubt it's the heater core....notice any dampness on the passenger side floor or smell antifreeze? EDIT:What year is your truck and have you ever flushed the system?
I still think it's the mixer door...i'd look into it more if I were you. You usually won't hear the mixer when changing the temp....the routing doors you will though.
2003 1500QC 4.7 2WD
Champion
Joined: Mar 2004
Posts: 2,703
Likes: 2
From: Bremen, GA.
RE: heater problem (recently replaced rad and water pump)
Something to ponder....
MAXIMUM HEATER OUTPUT: TEST AND ACTION
Engine coolant is provided to the heater system through two heater hoses. With the engine idling at normal operating temperature, set the temperature control to maximum heat position, the mode control to the floor position, and the blower motor control to the highest speed position. Using a test thermometer, check the temperature of the air being discharged from the floor outlets. Compare the test thermometer reading to the Heater Temperature Reference chart.
Ambiant air temp 60f/15.5c70f/21.1c80f/26.6c90f/32.2c
minimum air temp at144f/62.2c 147f/63.8c150f/65.5c 153f/67.2c
floor outlet
If the heater outlet air temperature is below the minimum specification, refer to Group 7 - Cooling. Both of the heater hoses should be hot to the touch. The coolant return heater hose should be slightly cooler than the coolant supply heater hose. If the return hose is much cooler than the supply hose, locate and repair the engine coolant flow obstruction in the cooling system. Refer to Group 7 - Cooling for more information.
OBSTRUCTED COOLANT FLOW
Possible locations or causes of obstructed coolant flow are as follows:
[ul][*]Faulty water pump.[*]Faulty thermostat.[*]Pinched or kinked heater hoses.[*]Improper heater hose routing.[*]Plugged heater hoses or supply and return ports at the cooling system connections.[*]Plugged heater core. [/ul]
If proper coolant flow through the cooling system is verified, and heater outlet air temperature is low, a mechanical problem may exist.
MECHANICAL PROBLEMS
Possible locations or causes of insufficient heat due to mechanical problems are as follows:
[ul][*]Obstructed cowl air intake.[*]Obstructed heater system outlets.[*]Blend-air door(s) or actuator(s) not functioning properly.[*]Faulty blower motor system[*]Faulty A/C-heater control [/ul]
TEMPERATURE CONTROL
If the heater outlet air temperature cannot be adjusted with the temperature control on the A/C-heater control, the following could require service:
[ul][*]Faulty A/C-heater control.[*]Faulty blend door actuator(s).[*]Faulty, obstructed or improperly installed blend-air door.[*]Faulty related wiring harness or connectors.[*]Improper engine coolant temperature. [/ul]
MAXIMUM HEATER OUTPUT: TEST AND ACTION
Engine coolant is provided to the heater system through two heater hoses. With the engine idling at normal operating temperature, set the temperature control to maximum heat position, the mode control to the floor position, and the blower motor control to the highest speed position. Using a test thermometer, check the temperature of the air being discharged from the floor outlets. Compare the test thermometer reading to the Heater Temperature Reference chart.
Ambiant air temp 60f/15.5c70f/21.1c80f/26.6c90f/32.2c
minimum air temp at144f/62.2c 147f/63.8c150f/65.5c 153f/67.2c
floor outlet
If the heater outlet air temperature is below the minimum specification, refer to Group 7 - Cooling. Both of the heater hoses should be hot to the touch. The coolant return heater hose should be slightly cooler than the coolant supply heater hose. If the return hose is much cooler than the supply hose, locate and repair the engine coolant flow obstruction in the cooling system. Refer to Group 7 - Cooling for more information.
OBSTRUCTED COOLANT FLOW
Possible locations or causes of obstructed coolant flow are as follows:
[ul][*]Faulty water pump.[*]Faulty thermostat.[*]Pinched or kinked heater hoses.[*]Improper heater hose routing.[*]Plugged heater hoses or supply and return ports at the cooling system connections.[*]Plugged heater core. [/ul]
If proper coolant flow through the cooling system is verified, and heater outlet air temperature is low, a mechanical problem may exist.
MECHANICAL PROBLEMS
Possible locations or causes of insufficient heat due to mechanical problems are as follows:
[ul][*]Obstructed cowl air intake.[*]Obstructed heater system outlets.[*]Blend-air door(s) or actuator(s) not functioning properly.[*]Faulty blower motor system[*]Faulty A/C-heater control [/ul]
TEMPERATURE CONTROL
If the heater outlet air temperature cannot be adjusted with the temperature control on the A/C-heater control, the following could require service:
[ul][*]Faulty A/C-heater control.[*]Faulty blend door actuator(s).[*]Faulty, obstructed or improperly installed blend-air door.[*]Faulty related wiring harness or connectors.[*]Improper engine coolant temperature. [/ul]
Record Breaker
Joined: Jan 2007
Posts: 2,451
Likes: 0
From: CA
RE: heater problem (recently replaced rad and water pump)
You said both hoses are hot so I doubt it's a plugged core. I'd personally get to the mixer door and visual verify that it's 100% working....you could also swap out the HVAC control unit with someone else's and see if that's the prob. You're shooting yourself in the foot by not being 100% sure in your troubleshooting steps before moving on to the next possibility. Just my .02
Thread Starter
|
Professional
Joined: Jun 2005
Posts: 204
Likes: 0
From:
RE: heater problem (recently replaced rad and water pump)
ORIGINAL: SeVeReDiStOrTiOn
You said both hoses are hot so I doubt it's a plugged core. I'd personally get to the mixer door and visual verify that it's 100% working....you could also swap out the HVAC control unit with someone else's and see if that's the prob. You're shooting yourself in the foot by not being 100% sure in your troubleshooting steps before moving on to the next possibility. Just my .02
You said both hoses are hot so I doubt it's a plugged core. I'd personally get to the mixer door and visual verify that it's 100% working....you could also swap out the HVAC control unit with someone else's and see if that's the prob. You're shooting yourself in the foot by not being 100% sure in your troubleshooting steps before moving on to the next possibility. Just my .02
not sure how i'm going to get to the mixer door
Thread Starter
|
Professional
Joined: Jun 2005
Posts: 204
Likes: 0
From:
RE: heater problem (recently replaced rad and water pump)
ORIGINAL: nickbbb
I got one for you! my 2003 QC 1500 is blowing nice hot air on the passenger side but not on the driver side no matter what i do. anny suggestions?
I got one for you! my 2003 QC 1500 is blowing nice hot air on the passenger side but not on the driver side no matter what i do. anny suggestions?