Question about 2004 Chevrolet Malibu
Look at the temp on your scanner data
What do you usually see on other vehicles
Why would you bypass a heater core?
What does that prove?
Customer needs heat
Use an infared gun & combustion gas tester
Posted on Jan 13, 2013
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Posted on Jan 02, 2017
SOURCE: 1994 CAPRICE CLASSIC LS
had same problem need to flush out the heater core .. plus make sure you do not have a air pocket in the coolant system after you changed the T-stat
Posted on Oct 17, 2008
After replacing the thermostat, you must bleed the air from the cooling system.
To bleed air from the 2.2L and 2.5L engines, remove the plug or sensor on the top of the thermostat housing. Fill the radiator with coolant until the coolant comes out the hole. Since the plug is made out of steel and the thermostat housing is aluminum, it is a good idea to apply an anti-seizing compound or Teflon® tape on the plug threads prior to installation. Install the plug and continue to fill the radiator. This will vent all trapped air from the engine.
Any trapped air in the heating system will have to be displaced by coolant. Once the cooling system is filled, with the radiator cap off, turn of the heater at it's highest setting. Start the engine and allow it to reach operating temp. You should see a drop in the coolant level as the air in the heating system is displaced by coolant. Add coolant to the proper level and replace the radiator cap.
Keep a close eye on the coolant level for at least the next couple of weeks. The cooling system is a "closed" system. Any significant decrease in coolant level indicates a problem.
If you have any questions, let me know.
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Drive safe and be warm.
Posted on Feb 02, 2009
Check heater control valve to make certain it is opening and allowing coolant to get into the heater core.
This is usually located to the rear of the engine close to the firewall. Coolant hoses should run to it and away from it to carry hot coolant inside the car.
Posted on Oct 10, 2009
first of all the water pump doesn't have a heater, all the water pump does is cycle water (coolant) throughout the cooling system, the heater is up inside the dash behind the glove box.
I would feel the two 3/4" heater hoses that run from the engine into the heater core, if both of them are hot (providing the engine is at full temp) it one is hot and the other is cold maybe the heater core is plugged.
Posted on Jan 11, 2010
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