No heat

Asked by Guru5WY98 Dec 31, 2017 at 03:18 PM about the 2009 Dodge RAM 1500 SLT Quad Cab 4WD

Question type: Maintenance & Repair

I had to boost my truck this morning is -36 a check engine
light came on and I have no heat now but blower fan
works coolant is full

3 Answers
103,435

KenF answered 6 years ago

Negative 36? I think I would be happy just having a truck that started at that extreme. You may have full capacity on the coolant, but the coolant itself may have degraded over time, when was it last flushed? Did any part of cooling system ice up? Since CEL was on, pull the codes.

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F_O_R answered 6 years ago

Maybe the thermostat stuck open. That level of cold plays havoc with everything.

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F_O_R answered 6 years ago

Make sure your coolant mix is rated for -40 or lower. You should probably have 60% anti- freeze - 40% water at those temperatures.

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