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Old 12-27-2004, 05:19 AM   #1
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Heater not working so well, how to flush heater core??

I don't want to change the heater core yet, so I want to try to flush it out so hopefully it will make it through this winter. How do I do this? Thank you.
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Old 12-27-2004, 07:16 AM   #2
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Quote:
Originally Posted by whiteponygt98
I don't want to change the heater core yet, so I want to try to flush it out so hopefully it will make it through this winter. How do I do this? Thank you.
Brent
Remove the hoses going to your heater core.

Take a waterhose, and a another 5/8" heater hose hose, Put it on the OUT side of the heater core (Yes reversed).

Flush the core out in reverse. This sometimes will get the junk out of the core.

If you have a 160 degree thermostat in your car, the heater wont get as hot as if you had a 190 thermostat in the car.
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Old 12-27-2004, 09:21 AM   #3
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Quote:
Originally Posted by Dac
Remove the hoses going to your heater core.

Take a waterhose, and a another 5/8" heater hose hose, Put it on the OUT side of the heater core (Yes reversed).

Flush the core out in reverse. This sometimes will get the junk out of the core.

If you have a 160 degree thermostat in your car, the heater wont get as hot as if you had a 190 thermostat in the car.
What he said but to add to the fix. Take the hose that goes to the heater core while flushing and cut a small slot in it and take a air hose that has a blow gun with a rod on it and insert it in the hose with the water running through it to flush the core blast air and water at the same time.
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Old 12-27-2004, 11:03 AM   #4
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The water hose and air trick can be a problem if: you apply too much pressure to the system. You could over pressurize the core and split a seam/connection. The system is designed for 13#/16 # with a margin over. Water can run 40# to 80# and air to 125#.
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Old 12-27-2004, 12:50 PM   #5
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Ya'll are badass. I reversed flushed the heater core and now mine works. Yeah! I just installed a new 306, Griffen radiator and stuff and my heater decided not to work. Well, thanks, it now blows hot.
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Old 12-27-2004, 01:46 PM   #6
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Quote:
Originally Posted by Dac
Take a waterhose, and a another 5/8" heater hose hose, Put it on the OUT side of the heater core (Yes reversed).
Which one is the "out" side?
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Old 12-27-2004, 03:08 PM   #7
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The lower one is the outside or return line. I just put the water hose right up to it and blasted it through. Run it both way for a few minutes.
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Old 12-27-2004, 04:23 PM   #8
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The lower one is the outside or return line. I just put the water hose right up to it and blasted it through. Run it both way for a few minutes.
MAKE SURE you put the hoses back on the right ports.

Trace the waterlines.

The line going to your intake (Metal tube to your INTAKE before the thermostat is the High Pressure line or the INLET tube for your core). The Line going to your waterpumpe is the Low Pressure Line or the Outlet tube of your heater core.
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Old 12-27-2004, 05:16 PM   #9
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Quote:
Originally Posted by bronzesink8
The water hose and air trick can be a problem if: you apply too much pressure to the system. You could over pressurize the core and split a seam/connection. The system is designed for 13#/16 # with a margin over. Water can run 40# to 80# and air to 125#.
Yeah all this is good info just be sure not to overpressurize the system. Zerex makes a good flush product called super flush it is a chemical flush that helps to break down clogging.
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