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What would make your heat blow hot when your driving but blow cold when at idle

Tiny
MIMMS.THOMAS
  • MEMBER
  • 2002 SATURN SL1
  • 145,000 MILES
Ive replaced the water pump, thermostat and over flow cap but still does the same thing at this point I'm lost and don't know what else to look at
Wednesday, December 14th, 2011 AT 4:08 PM

4 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Sound like a restricted or clogged up heater core. Have you put any coolant stop leak in the coolant?
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Wednesday, December 14th, 2011 AT 4:11 PM
Tiny
MIMMS.THOMAS
  • MEMBER
  • 2 POSTS
No but it is a brown looking color how would I flush the heater core out
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Wednesday, December 14th, 2011 AT 4:16 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
I would remove both heater hoses then try flushing water thru it with a hose. If you have a air compressor turn the regulator way down and use a little compressed air to clear it.
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Wednesday, December 14th, 2011 AT 4:30 PM
Tiny
MIMMS.THOMAS
  • MEMBER
  • 2 POSTS
Both heater hoses go into my firewall right
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Wednesday, December 14th, 2011 AT 5:00 PM

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