The fan blows cold air, but will not give warm air. All the settings are set to warm (90). Checked all fuses that are listed in owners book, all ok. Have added some coolant, less than 1 gallon. What to do next?
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Re: warm air from heater
You might have got air in the system since it was low . also check the 2 hoses going into the heater core , to see if they are both hot . if only one , or none are hot , the core might have air in it or is clogged up . if you dont get heat by the end of the day , take both the heater hoses off @ the motor and put one end of the hose to the water hose, and aim the other to the ground . change up the hoses so that it gets flushed both ways if its clogged that will clean it out. if those things check out , it might be that the hot / cold switch has gone bad
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The only way for you to use the heater system to cool the engine is by having the temp setting to highest setting and highest blower speed. That will then make your heater ocre a cooling device for the engine. When you turn on the a/c system, it does not cool the engine, and it shuts itself off whent he engine gets hot to protect the engine. That's when it blows warm air.
So check the fuse I talked about. and email me direct as I said. We need to run 12 volts from teh battery direct to the cooling fan. I will tell you how to make a test jumper to make sure the cooling fans work. You have 2 relays and 2 cooling fans, and I don't think they all quit at the same time. I think they are good. but testing will tell us
I'm no 'expert' but it sounds like possibly 2 different problems. Your heat comes from warm/hot coolant circulating through the heater core, and the fan blowing air through/over it. If your thermostat is not opening the coolant won't circulate. Thermostat is a not too difficult or costly starting place. No air flow leads me to think you have a blower motor issue, perhaps start with the fuse. Hope this helps.