Heater stopped blowing warm

2003 OLDSMOBILE ALERO
145,000 MILES • 6 CYL • 2WD • AUTOMATIC
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ZACHARY AUSTIN
  • MEMBER
  • 1 POST
Okay, so few weeks ago heater stopped blowing warm only blows cold now. some times the car will get to warm and push antifreeze out the overflow. car has never gotten to more then little above the half line. also, all the hoses connected to cooling and heating system get really hot. Help
Feb 14, 2018 at 7:45 PM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Good morning.

Possible causes:

1. Thermostat stuck open.
2. coolant level low.
3. heater core clogged with debris.
4. leaking head gasket allowing super heated coolant into the system.

Has the car overheated at any time?

Roy
Feb 15, 2018 at 1:28 AM
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