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Heater core function

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Old Dec 17, 2021 | 10:16 PM
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Default Heater core function

Am I correct. If the heater cable is in the close position the water does not flow through the heater core?
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Old Dec 17, 2021 | 11:51 PM
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I assume you have a pre '88. Yes, the valve shuts off coolant when closed. GM eliminated that valve in '88 up.
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Old Dec 18, 2021 | 06:47 PM
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Originally Posted by jv9999
I assume you have a pre '88. Yes, the valve shuts off coolant when closed. GM eliminated that valve in '88 up.
Yes it is a 1984. This was a florida car and the heater has not been used in 16 years.. It is the orginal heater core.. If I do not use heater or defroster can I assume the heater core will not leak or that the fluid inside has evporated. Is there any way to remove water if it us still in the core?
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Old Dec 18, 2021 | 07:22 PM
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Most owners when there heater core started leaking just by-passed it! This was no fluid enters or exit.

To replace isn't the easiest job!
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Old Dec 18, 2021 | 11:45 PM
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Originally Posted by ps374
Yes it is a 1984. This was a florida car and the heater has not been used in 16 years.. It is the orginal heater core.. If I do not use heater or defroster can I assume the heater core will not leak or that the fluid inside has evporated. Is there any way to remove water if it us still in the core?
The heater core still pressurizes with the valve closed as the valve only blocks one side. If you want to eliminate it, you need to bypass it.
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Old Dec 19, 2021 | 06:57 PM
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Originally Posted by jv9999
The heater core still pressurizes with the valve closed as the valve only blocks one side. If you want to eliminate it, you need to bypass it.
Can you explain this a little better. I have the facftory FSM and it gives little info on the operation of the heater system. Anything you want to know about AC.
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