Question about 2003 Pontiac Grand Am

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Heat not working and service engine light on

Last week I noticed that the heat was not working in my car. It will blow cold air, but not warm air. I also then noticed looking at the gages that the car is running just a little hotter than normal. Then this morning the service engine soon light came on? It is a 2003 pontiac grand am with 55,000 miles. What do think the problem might be so I know how much this could cost to fix?
Thanks,

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Many times no heat is the result of low coolant which means there isn't enough to properly flow through the heat core. Check the coolant level. If you're running hot it could also be from low coolant. If the coolant level is normal you may very well have a stuck thermostat. If you do have low coolant the next step is to find the reason why it's low.

Did you pull the codes yet?

Posted on Oct 05, 2009

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Posted on Jan 02, 2017

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http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html

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