Question about 2004 Chevrolet Impala

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Not getting heat in cab put new heater core in an thermostat still nothing back flush the core still nothing

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  • wterpstra1 Oct 20, 2008

    anti-freeze is not circulating through my heater core. I thought the core might be plugged so I replace the heater core but still no heat. The hoses going into and out of the heater core are cold even after the truck is warmed up. What do I need to do to get heat.

  • harleyrider1 Jan 27, 2009

    2004 chevy impala 3.4l the cab gets warm then cold warm cold. it had a small waterpump leak, i replaced that, but still doing same thing. i also flushed the motor

  • needs heat May 11, 2010

    how do you purge air in cooling system plus no vacume lines

  • yadayada
    yadayada May 11, 2010

    Is the coolant hose hot going into the heater core?? Have you purged the air from the cooling system??

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2003 checy impala--no heat in cab peoblem--I have changed out the heater core and power flushed twice and it works for about two weeks each time and then returns to the no heat condition again. frustraTED NEED POSSIBLE SOLUTIONS.

Posted on Nov 30, 2008

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Is the blower running at all? Also, make sure the main air intake vent is free of obstructions.

Also, a vacuum leak could cause the actuator to not function correctly. I'd check into the vacuum lines if all else fails. I've had too many cars here with heat/air problems due to vacuum loss and the actuators not switching correctly.

Posted on Sep 10, 2008

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It could be your blend door or not enough flow through your heater core. Try removing the heater hoses at the heater core and flushing both directions with a garden hose!

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Flushing the system and adding new antifreeze would have been my first suggestion, so, thanks for mentioning that.

We should check a couple of other things.

1. Start the engine, let it run for 6 to 8 minutes, ( with the heater off ), to allow the engine to reach normal operating temperature. Then, turn your heat and fan wide open, then listen to the engine to see if you hear a click, you should be able to hear the thermostat open up to circulate the coolant. If you do not hear a click, you may have a stuck, or partially stuck thermostat.

If the thermostat doesn't open, the hot water/coolant will not flow in to the heater core.

2. In the back of the engine, on the fire wall, locate the inlet and outlet hoses to the heater core. They are both usually about 1 inch in diameter. Carefully feel each hose. Both should be hot. If only one is hot it's because you have blockage somewhere preventing the circulation of coolant to the heater core.

The most common area for blockage is in the heater core itself. Sometimes flushing doesn't clear it out.

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I have a 1997 Saturn SL2. I have no heat. We have replaced the thermostat, the water pump and flushed the system. Still no heat! What's next..replacing the heater core or power flushing? If its...


It is your heater core, there is nothing else left.

The heater housing is usually under the dash, and it must be removed to gain access to the heater core.Procedures for removing a dash, and heater core vary. But for the core:
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"remove the panels" or "split the case"1c3d50c.gif (Usually screwed together.)
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check if both heater hoses going into firewall are hot.. if only one is hot then your heater core is stopped up..you can take both lines loose and take a water hose and back flush,,, force hose on one inlet of heater core for a minute and then the other.. keep going to you get a good flow...make sure heater valve is open, not just valve position take loose and confirm clear..last make sure your thermostat is not stuck open keeping engine from comming up to temperature

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1 Answer

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i don't know realy if there is a fuse (though i doubt it) but issues with heatting may be this will help.

If the carpet under the heater core is damp, or if antifreeze vapor or steam is coming through the vents, the heater core is leaking.
Remove it and install a new unit (most radiator shops will not repair a leaking heater core.
If the air coming out of the heater vents isn't hot, the problem could stem from any of the following causes:
  • The thermostat is stuck open, previnting the engine coolant from warming enough to carry heat to the heater core. Replace the thermostat.
  • There is a blockage in the system, Preventing the flow of coolant through heater core. Feel both heater hoses the firewall. They should be hot.if one of them is cold, there is an obstruction in one of the hoses or in the heater core,or the heater control valve is shut. Detach the hoses and back flush the heater core with a water hose. If the heater core is clear but circulation is impeded, remove the two hoses and flush them out with a water hose.
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1 Answer

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If u have issues with heatting may be this will help.

1- If the carpet under the heater core is damp, or if antifreeze vapor or steam is coming through the vents, the heater core is leaking.Remove it and install a new unit (most radiator shops will not repair a leaking heater core.

1 - If the air coming out of the heater vents isn't hot, the problem could stem from any of the following causes:
  • The thermostat is stuck open, previnting the engine coolant from warming enough to carry heat to the heater core. Replace the thermostat.
  • There is a blockage in the system, Preventing the flow of coolant through heater core. Feel both heater hoses the firewall. They should be hot.if one of them is cold, there is an obstruction in one of the hoses or in the heater core,or the heater control valve is shut. Detach the hoses and back flush the heater core with a water hose. If the heater core is clear but circulation is impeded, remove the two hoses and flush them out with a water hose.
  • If flushing fails to remove the blockage from the heater core, the coremust replaced.

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2 Answers

My heater not working, i replaced thermostat and radiator hoses, had radiator flushed and rodded, and still no heat. What is wrong?


Too much blockage in heater hoses or heater core.
Bypass valve may be stuck on "bypass" .

1. Remove bypass "Tees", but don't discard.
Replace with straight-through hose fittings.
The core may start leaking under the water pressure since there is no bypass hose.

Once the heater starts working, put Tees back in place. You need bypass protection or the engine will overheat.

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