Question about 2005 Chevrolet Impala

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2005 Impala Leaking Coolant and no heat

Radiator held 16 lbs pressure. No leaks detected. I think its one or both of the following. Bad thermostat and/or bad water pump.

Leaking is minor. Seems to occur after the car has fully cooled down. More fluid leaks when the heater is on. But again, its only after the car has cooled.

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  • J. S. Montel
    J. S. Montel Nov 08, 2008

    2005 Impala leaking and overheating. I'll try pressure test then check thermostat if water pump isn't the problem.

  • Anonymous Mar 17, 2014

    heater core clogged to make car over heat

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  • Chevrolet Master
  • 2,122 Answers

Hi lfortunato,

Try the radiator cap, if that doesn't work check your interior heater controls.... as you've already pressure tested, it sounds unlikely to be the pump..... If it was defective it would have leaked with that pressure. The thermostat may also cause the problem, if it's stuck open....

Regards Johngee10

Posted on Sep 28, 2008

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  1. Drain the radiator and recycle the engine coolant.
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To install:
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NOTE The water inlet must be installed within 5 minutes of applying the sealant.

  1. Install the thermostat in the water inlet, with the jiggle valve at the topmost (12 o'clock) position.
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  3. Install the bypass hose to the water inlet, using a new clamp.
  4. On 1993-98 3.0L engine models:
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    2. Install the A/C high pressure line bracket and tighten the bolt to 45 inch lbs. (5 Nm).
    3. Install the upper radiator hose bracket and tighten the bolt to 34-48 ft. lbs. (46-65 Nm).




NOTE Allow the sealant to dry for at least 30 minutes before adding coolant.

  1. Fill the cooling system. Run the engine and check for leaks.

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