heater blows cold

2005 MAZDA TRIBUTE
146,000 MILES
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PALMERPJ
  • MEMBER
  • 1 POST
After replacing antifreeze, the heater blows cold when at idle or slow speeds. It is hot when driving on highway Flushed radiator and put in new antifreeze. Heater used to get hot as soon as car warmed up. Now the heater is cold unless driving faster than 20-30 mph.
Mar 10, 2012 at 9:31 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
It sounds like the heater core maybe plugged or the heater control valve is not opening completely.
Mar 10, 2012 at 9:32 PM
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