WHICH HOLES DO I USE TO FLUSH HEATER CORECHANGED...

  • Tiny
  • Anonymous
  • 2007 Chevrolet Uplander
  • 130,000 miles

Which holes do I use to flush heater core
changed thermostat still no heat

Thursday, November 29th, 2012 AT 7:00 PM

1 Reply

  • Tiny
  • freemba
  • Expert
  • 1,142 posts

Before flushing and with engine at normal operating temp. Check both heater hoses to see if they are hot---they should be. If one is hot and the other is not, suspect a clogged heater core.
Post results and let me know if more assistance is needed.

Disconnect both heater core hoses at the firewall. Use a water hose to run water (at a high rate of speed) through the heater core. Doesn't matter which hose you use as the inlet or outlet during flusing. I usually flush through both hoses (one at a time).

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Sunday, December 2nd, 2012 AT 7:17 PM

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