Common questions

Why is my hot water heater still hot after plugging in?

Why is my hot water heater still hot after plugging in?

That certainly points to a restricted heater core. If the heater core was plugged but the coolant was able to circulate around it without exchanging any heat then the outlet hose would still be hot. There is something else going on here. As a disclaimer, I have never been a professional mechanic but mechanical systems don’t defy logic or physics.

Why is my car heater core not working?

Low coolant in the radiator can be a major reason the heater core isn’t getting enough fluid circulating into it to warm the vehicle. Fill the radiator and overflow tank as needed with equal parts antifreeze and water.

What should I do if my water heater core bursts?

Depending on your water pressure, some hoses can run up to 100 lbs. per square inch of water pressure–which can easily burst a heater core seam. Add a little more pressure until it blows the gunk out of the heater core. This is messy, so don’t be wearing your Sunday best. Replace the hoses to the heater core and tighten the clamps.

How can I tell if my heater core is plugged?

You have all the symptoms of a plugged heater core. Inlet and outlet temps of the heater hoses should be very close. Just because you have flow in and out of the heater core connections doesn’t mean the core isn’t plugged. The inlet and outlet are on the same side of the core.

Low coolant in the radiator can be a major reason the heater core isn’t getting enough fluid circulating into it to warm the vehicle. Fill the radiator and overflow tank as needed with equal parts antifreeze and water.

That certainly points to a restricted heater core. If the heater core was plugged but the coolant was able to circulate around it without exchanging any heat then the outlet hose would still be hot. There is something else going on here. As a disclaimer, I have never been a professional mechanic but mechanical systems don’t defy logic or physics.

Depending on your water pressure, some hoses can run up to 100 lbs. per square inch of water pressure–which can easily burst a heater core seam. Add a little more pressure until it blows the gunk out of the heater core. This is messy, so don’t be wearing your Sunday best. Replace the hoses to the heater core and tighten the clamps.

How can you tell if your heater core is clogged?

One of these hoses is an inlet to the heater core coming from the radiator; the other is an outlet coming from the heater core. If the inlet hose is hot/warm and the outlet hose is cold, you can pretty much determine your heater core is clogged.

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Ruth Doyle