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i recently bought a 04 pontiac boneville and i am having issues with the heater sometimes when you turn the heater on it will just blow cool air from outside other times if the car has been running for a long time the heater will eventually start blowing warm air i suspect possible clogged heater core
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The first thing I would do after making sure the system is full of coolant is replace the thermostat. It’s a low cost repair and will rule out low engine temperature as the cause of the peoblem.
🙂 I am sorry that you are having a problem. You need to warm up the engine again and turn on your heater. If it feels cold, then lift your hood and look for your heater hoses. There should be two small hoses going from the engine to the firewall on the passenger side. BEING CAREFUL, feel the hoses for being hot. You just need to touch the hoses and see if it feel warm to hot. If only one hose feel warm or hot and the other hose does not, you have a clogged heater core in the dash. If both hoses fell hot, you have a failure under the dash. The most common failure of the heater is the air mixer door on the heater/air conditioning assembly under and inside the dash. The mixer door has a tendency to tear up the fiberglass assembly that holds the door. Good Luck and let us know what you find.
The first step in any situation like this is to check for air in the cooling system.
http://www.ericthecarguy.com/faq/solving-automotive-hvac-problems?start=5#HeaterProblems
the problem was a clogged heater core i flushed it and it works great but the problem was also a bad thermostat mine was broken and wasnt allowing coolant to flow at maximum output into the engine also had a bad water pump
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