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The presence of the valves usually restrict the coolant flow into the heater core.

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11y ago

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Why would water not flow though the heater coil?

Heater core plugged? Heater core airbound? Thermostat not opening to allow coolant flow?


In a 1998 Subaru outback the heater blower works but no warm air?

In Subarus the temp control for the heater does not control the coolant flow, just airflow past the heater core. If you get no heat, there is no coolant in the heater core -- either there is no coolant or it is not circulating.


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What controls the flow of hot water to the heater core on a 1993 Pontiac Sunbird?

Thermostat has to open to allow fluid flow. The supply hose to the heater core is located before the thermostat, forcing the coolant through the core even as the coolant is heating up. Water pump has to work properly to cause fluid to flow. Temperature control (lever) has to operate properly to allow fluid flow. System must not be air-bound to allow fluid flow Heater core must not be plugged


Why do I get no heat after replacing heater core in 1995 jimmy?

Your system could be low on coolant to flow through the heater core. You may also have a blockage somewhere preventing coolant flow into the heater core. If you can hear your blower motor blowing, perhaps the dash was put back into place incorrectly and the heat is being diverted away from it's intended path.


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What would cause the heater in a 1998 Chrysler Concord to blow cool air?

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The supply hose to your heater core is hot but the return is not?

This would indicate relatively low coolant flow and heat is turned on.


How do you change the heater core of a 1997 corolla and what are the symptoms of a bad heater core?

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