Why does it blow cold still

Asked by Richard Jan 08, 2018 at 10:23 AM about the 1993 GMC Sierra 1500 C1500 Standard Cab LB

Question type: Maintenance & Repair

I have a 1993 gmc c1500 my heater is blowing
cold air still I've replaced heater core brand new
I've replaced thermostat brand new I've replaced
thermostat brand new I've replaced radiator brand
new I dnt kno what else I need to do

2 Answers
45,285

jamnblues answered 7 years ago

wow- that's a lot of replacin' there- instead of guessing (which is what I'm doing here) you should have started with the controls that turn on the heater valve-

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3,800

olds403 answered 7 years ago

Are the heater hoses warm where they go from the engine into the heater core ???One comes off the water pump the other from the top of the intake manifold . Check to make sure the coolant isn't restricted on account of rust or debri

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