heat issues.

dirtscooter13 · #1 (**permalink**) 02-03-2013, 09:14 AM

when the truck gets warm i turn on my heat and it is hot for about 15 secs then goes cold. Is this a thermostat gone bad or something different?

**351fifty** · #2 (**permalink**) 02-03-2013, 09:31 AM

Sounds like heater core

dirtscooter13 · #3 (**permalink**) 02-03-2013, 09:36 AM

is there any way to check to make sure that is what it is?

dirtscooter13 · #4 (**permalink**) 02-09-2013, 08:34 AM

i am going to change out my heater core today. I am going to drain out the coolant out of the radiator what coolant should i get to replace it with?

AMSOILdealer · #5 (**permalink**) 02-09-2013, 10:40 AM

Try back flushing the heater core prior to replacing. Remove hoses and connect garden hose to return side, then reverse to check the flow.

**351fifty** · #6 (**permalink**) 02-09-2013, 01:07 PM

I used 2 gallons of extended life coolant and 4-5 gallons of purified water

dirtscooter13 · #7 (**permalink**) 02-09-2013, 03:24 PM

so i replaced my heater core today, i am glad i didnt take it to a shop and let them charge me for 8 hours worth of work it was simple. But was not the issue... i had to buy too heater cores because they offer a light duty one and a heavy duty one and i wasnt sure which one it took. any way after getting it all back together and driving back to the parts store when the truck got heated up i turned on the heat and it still blew cold air out... now i am upset ha so i returned the light duty heater core and told the guy that it didnt fix my problem. He recommended a radiator cap and sure enough for 6.99 before i left the drive way it was blowing out hot air.