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Old 12-15-2018, 10:18 AM   #1
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Location: Sidney KY
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Low heat

Just started recently having lukewarm heat. Heat gauge was a little low so I replaced the tstat and no difference. Heat is not as hot as before, if I run the fan speed on low it gets fairly hot but when i increase the fan speed the heat will turn to blowing cool. I turn it back to low speed and after a bit its warm. Any ideas on what I should check first ?

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Old 12-15-2018, 01:46 PM   #2
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Make sure you have very hot coolant in both of the heater core hoses. I would also check your blend door, if it's broke or stuck in the fresh air mode, you will be getting cold air mixed with the heated air.
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Old 12-16-2018, 06:39 AM   #3
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Check hoses for heat in and out like stated. If you have it on low and not high and have a little heat that’s most likely a restricted heater core or low coolant level/air
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