Heat Not Working
Post Fiend
Joined: Apr 2004
Posts: 6,473
Likes: 4
From: Lafayette, IN
I agree with broncoderek. These trucks are notorious for trapping air in the upper parts of the coolant system (which includes the heater core) when the coolant has been drained and replaced.
Start cold, run without the radiator cap, and fill the overflow bottle to the "COLD" mark. Turn the heater on all the way (fan and temp all the way to hot), and leave the windows open. Top off the coolant as the truck warms up and you see the coolant level drop. THEN if you don't get heat in the cab and the hoses are not hot, start messing with the heater core.
Jason
Start cold, run without the radiator cap, and fill the overflow bottle to the "COLD" mark. Turn the heater on all the way (fan and temp all the way to hot), and leave the windows open. Top off the coolant as the truck warms up and you see the coolant level drop. THEN if you don't get heat in the cab and the hoses are not hot, start messing with the heater core.
Jason
Posting Guru
Joined: Apr 2011
Posts: 1,119
Likes: 1
From: Hartland, WI
Amazon.com: Lisle 24610 Spill-Free Funnel: Automotive
Makes life a lot easier for these kind of jobs. You'll be able to see the air pockets bubble up when they escape with one of these.
Makes life a lot easier for these kind of jobs. You'll be able to see the air pockets bubble up when they escape with one of these.
Elder User
Joined: Jan 2008
Posts: 635
Likes: 0
I agree with broncoderek. These trucks are notorious for trapping air in the upper parts of the coolant system (which includes the heater core) when the coolant has been drained and replaced.
Start cold, run without the radiator cap, and fill the overflow bottle to the "COLD" mark. Turn the heater on all the way (fan and temp all the way to hot), and leave the windows open. Top off the coolant as the truck warms up and you see the coolant level drop. THEN if you don't get heat in the cab and the hoses are not hot, start messing with the heater core.
Jason
Start cold, run without the radiator cap, and fill the overflow bottle to the "COLD" mark. Turn the heater on all the way (fan and temp all the way to hot), and leave the windows open. Top off the coolant as the truck warms up and you see the coolant level drop. THEN if you don't get heat in the cab and the hoses are not hot, start messing with the heater core.
Jason
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mlelah
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Jan 10, 2015 02:27 PM
