Question about 2006 Pontiac Grand Prix

1 Answer

What should the temperature of the heater core inlet hose be?

The hose from the radiator to the engine block is reading just over 200 degrees but the inlet hose to the heater core is only reading just over 150 degrees. Since the coolant is running through the engine block before going into the heater core inlet hose, shouldn't it be reading at least the temp of the hose leading from the radiator to the engine block? The heat is not working well in the car, especially when it is below freezing outside, and we think it may be because there is a clog/blockage of the heater core inlet hose coming from the block. We have already replaced the water pump, thermostat, radiator cap and coolant temp sensor and we have had a coolant flush and fluid replacement done all within the last 2 weeks. I also did a manual reset of the HVAC actuator with no results. The heater core and blend doors seems to be working just fine. Please help!!!!!!

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  • Tracie Steele
    Tracie Steele Nov 14, 2014

    Well that's not true at all. And I am speaking of the heater core, NOT the water pump. There are hoses that run directly from the back of the engine block into the heater core and back. The heater core is located in the cabin behind the dash and you can clearly see all of the lines running through the firewall from the engine compartment. The heat used to work much better than it is now so there clearly is a problem that is not related to recirculating the cabin air......

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  • Pontiac Master
  • 44,435 Answers

Heater hoses run from the rear of the block to the water pump. One hose into the heater should be hotter than the other because heat is transferred in the heater in the car. . The cooling system draws water from the bottom of the radiator ( water pump inlet)which is always cooler than the top hose and dispenses it throughout the engine and heads including the heater core. It is then pushed past the thermostat with all the heat from the engine to the top of the radiator where it is cooled down by the air passing through the radiator . Check that the air vent for the cabin is set to recirculated cabin air and not fresh air from the outside as it will require recirculated air to increase in temperature to work properly

Posted on Nov 14, 2014

Testimonial: "Well that's not true at all. And I am speaking of the heater core, NOT the water pump. There are hoses that run directly from the back of the engine block into the heater core and back. The heater core is located in the cabin behind the dash and you can clearly see all of the lines running through the firewall from the engine compartment. The heat used to work much better than it is now so there clearly is a problem that is not related to recirculating the cabin air......"

  • 1 more comment 
  • Bill Boyd Nov 14, 2014

    as you describe the set up there is nothing that will move the water through the heater core. Water needs a high pressure side and a low pressure side to move so all you are getting is water from the back of the block that is cooling inside the heater core and relying on the same cooling water to reheat the heater core . get a diagram of the cooling system from a workshop manual as there is a possibility of a system cooling problem

  • Tracie Steele
    Tracie Steele Nov 14, 2014

    What? The water is being pumped through the heater core by the circulation of the running vehicle. There is an inlet hose and an outlet hose running from the back of the engine block to the heater core. I know exactly what I am talking about but NO idea what you are talking about.

  • Bill Boyd Nov 14, 2014

    no matter --your the one with the problem and if you know what you are talking about then why have you not fixed it instead of arguing about what you know.

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What should the heater core inlet hose temperature be?


It sounds as if you have a blockage in your heater core itself. You can usually remove both hoses from the core at the firewall and using compressed air, blow backwards into the heater core until it is cleared. While you are there I would suggest changing the plastic elbows that come off of the engine if they have not been changed already as they are known to crack and cause problems. They are even remaking them in metal instead of the plastic.

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Garry Phinney, I read over your solution, as well as the other ones provided. I forgot to mention that I put a cardboard in front of the radiator already. Also, as I mentioned, the dealer did a backflush...


heater cores in a new car will not be blocked but the heater water flow can be blocked. Remove the heater hoses of the heater core and join the two hoses together and clamp securely Now place a garden hose on one of the heater pipes an see if the water flows out of the other pipe . If not turn on the heater control and see if it does. If not run the engine and move the control and if you still do not get a flow then the fault will be in the control, selector switch or the tap actuator. . If ok then reconnect the heater hoses and clamp tight . It may be necessary to pressure bleed the air out of the system as an air lock will not allow sufficient water through the core to warm the car. The heater will be at engine operating temperature regardless of the ambient air temperature because the thermostat in the engine will only allow enough coolant into the radiator to maintain a constant 85 -95 degrees c. The only core that will fit the car will be one designed for that area but you may get an aftermarket core to fit as manufacturers do not make cores but use items made by radiator manufactures . However you will not have to replace the core . If the heater system is not working as designed to then it is a warranty problem and the dealer is legally required to fix it for you. If you cannot get satisfaction to your problem then contact the customer service division of the manufacturer and state your concerns very plainly.

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2006 grand prix heater only blows cold air. both heater hoses are hot blower motor works fine.


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Poor Heater System Performance CAUTION
Check all fluid levels and adjust as needed, before operating vehicle for extended periods at idle.
  1. Start the engine.
  2. Idle the engine until the thermostat opens (upper radiator hose will be hot) Is the engine at normal operating temperature (approx. 200° F)? If yes, go to the next step. If no, go to step 16.
  3. Set the mode selector to FLOOR mode.
  4. Set the heater control selector to the warmest temperature setting.
  5. Set the blower speed the lowest setting.
  6. Carefully feel the inlet and outlet heater hoses at the heater core. Is the inlet heater hose significantly hotter than the outlet heater hose? If yes, go to step 14. If no, go to the next step.
  7. Set the mode selector to PANEL mode.
  8. Select the maximum blower speed.
  9. Select the warmest temperature setting.
  10. Place a thermometer into the center I/P PANEL air outlet and affix a second thermometer to the heater core outlet heater hose.
  11. Record the temperature at the center I/P PANEL air outlet and at the heater core outlet heater hose. Are the two temperature readings about equal? If yes, go to the next step. If no, go to step 13.
  12. Inspect and repair the cowl, cowl area, recirculation door, and the HVAC evaporator/heater core case for cold air leaks. Repair any problems found, go to step 17.
  13. Inspect the temperature door operation. Repair any problems found, go to step 17.
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  16. Check for low engine temperature problems, Repair or replace as needed, go to step 17.
  17. Operate the system in order to verify the repair. If the system operates properly, the repair is complete. If the heater still does not work properly, repeat the entire procedure.

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1 Answer

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