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Is the valve for the heater core supposed to stay open? 2000 chevy Monte carlos

Posted by tenisha hunter on


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k spencer

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The butterfly valve should open and close, at your discretion, .being a 2000 model, it could work off vacuum , most australian & american cars of that era where / are vacuum operated , otherwise its has to be cable, or unlikely electric, with a solenoid .

but to answer your question, no, it should not stay open,

if ever you need to change your anti freeze, in the radiator, you should keep this valve open, as it will eliminate airlocks within the cooling system. .... if it is stuck open, 1st locate the valve, and check that it not look corroded, or damaged in anyway, you should see it activate ,when you have another person moves the lever inside , if not, look for a hose off, vacuum hose, will be a lil more tricky, as good chance it will be under the dash. . listen for hissing noises. .. the heater valve is not made to last forever, and do fail. .an easy buy from your after market auto store.

hope this info helps, kipp

Posted on Jan 21, 2015


Terry Hair

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There is no "valve" for the heater core. The heater core circulates hot water all the time. There is a hose usually just past the outlet of the water pump that provides enough pressure to cycle the coolant through the core. What turns the heat on and off is/are "blend doors" located inside the heater box under the dashboard. When you operate the heat controls, you adjust the blend doors so as to pass more (or less) air thru the heater core. If you have heat at all times, then you most likely have a broken control head or damaged blend door/actuator.

Posted on Jan 21, 2015

  • Terry Hair Jan 22, 2015

    WSith all due respect to Mr. Spencer, I respectfully disagree about a "butterfly" valve. GM stopped using them years ago for the simple reason that they DO corrode and fail too easily. Back in the days before auto A/C was common, these valves were used in place of the blend door that is used today. If you Google heater valve, or if you look at AutoZone or Rock Auto or Advance Auto, you wll find NO reference to a coolant valve. The only thing you may find is a blend door actuator, and that controls the flapper inside the heater box to route the blower air thru the A/C coil or the heater, or both. This is how you control inside temperature.



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SOURCE: replacing heater core on 2004 monte carlo

REMOVAL PROCEDURE 1. Remove the fuel injector sight shield. 2. Drain the cooling system. Refer to Draining and Filling Cooling System in Cooling System. 3. Use J 38185 in order to position aside the heater hose inlet and outlet clamps at the heater core. 4. Disconnect the inlet and outlet heater hose from the heater core. 5. Remove the RH Instrument Panel Closeout/Insulator panel. 6. Remove the LH Instrument Panel Closeout/Insulator panel 7. Remove the floor carpet. 8. Remove the rear floor air outlet duct from the holes in the floor reinforcement. 9. Disconnect the rear floor air outlet duct from the heater air outlet cover. 10. Remove the rear floor air outlet duct. 11. Remove the heater air outlet cover screws (2). 12. Remove the heater air outlet cover heat stakes (1) with a small chisel. 13. Remove the heater air outlet cover from the HVAC module assembly. 14. Remove the heater core cover screws (2). 15. Remove the heater core cover heat stakes (1) with a small chisel. 16. Remove the heater core cover from the HVAC module assembly. 17. Remove the heater core from the HVAC module assembly. 18. Remove the heater core foam seal (1) from the HVAC module assembly

Posted on Nov 08, 2009

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