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Can you hook up heater hoses the wrong way?

Updated: 9/19/2023
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13y ago

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of course you can!

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13y ago
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Q: Can you hook up heater hoses the wrong way?
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the hoses hook to the back of the engine one on the right and one on the left, best way to work on these is from the underneath.


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The easiest way to check is to feel the heater hoses going into the firewall. Check the hoses from a cold start and check that both hoses get uncomfortably hot at about the same rate. This is a good indication that coolant is flowing.


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I would disconnect both heater hoses from the engine, then fabricate a way to connect a garden hose to one of the hoses leading to the heater, then gently turn on water supply for a minute, then attach garden hose to opposite heater hose and flush again, then reattach both hoses to engine and top off coolant reservoir.


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Would the engine get hot on a 2001 expidition if the heater hoses were backwards?

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Where is the heater control valve on a 1995 Astro and how do you replace it?

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If heater core is plugged would there be any heat?

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How do you flush a heater core?

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