2006 Chevrolet Impala No heat at idle

Tiny
JOHN HO10
  • MEMBER
  • 2006 CHEVROLET IMPALA
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 135,000 MILES
Had "no heat at idle" a couple years ago. Had thermostat replaced and eventually heat at idle returned after cooling system air purge that I did myself. And I do not have an air bleed valve that I can find on this engine
However, this same issue has reared its ugly head again. Coolant is "full" and temp gauge is always half-way between C and H. I followed this procedure:
1. Engine cool. 2. Remove rad cap. 3. Disconnect upper heater core hose from metal pipe on engine. 4. Added coolant to pipe until full. Raised (as high as possible) rubber hose still attached to heater core and filled with coolant. 5. Reconnected heater core hose to pipe. 6. Started engine, RPM's to 1500-1700 steady. 7. Top off coolant at engine before reducing RPM's to idle speed, and replace rad cap. 8. Attain normal operating temp and check for heat at idle. Monitor coolant in reservoir. I again have heat at idle.
Why does this continue to occur? What else might be happening? Should both heater hose temps be the same? If not, which one should be hotter? Has GM ever issued a "silent" recall on this air-in the cooling system problem? Since the car was new, I've heard water "gurgling" behind dash at start-up. Strange.
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Thursday, December 5th, 2013 AT 6:48 AM

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Tiny
HMAC300
  • EXPERT
If working ok both hoses should be about the same hard to tell temp without a guage of some sort. Pull your hvac fuse for 60 seconds it may reset your actuators. I fboth hoses are hot then your actuators aren't working correctly. It cold be a control head not sending power or the actuators themselves. Pictured is rh one it can be replaced by dropping glove box door and letting box come all the way out.
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Thursday, December 5th, 2013 AT 7:18 AM

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