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Cold heater when idling

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Old Apr 7, 2019 | 02:15 PM
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Cold heater when idling
Hey guys..heater blows hot when running down the highway but when at idle it turns cold..any ideas?
 
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Old Apr 7, 2019 | 02:30 PM
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From: NW IA
Partially plugged heater core
Water pump going south
Low on coolant
Thermostat needing replaced
 
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Old Apr 8, 2019 | 01:54 PM
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From: Spanaway
Originally Posted by navistarnut
Partially plugged heater core
Water pump going south
Low on coolant
Thermostat needing replaced
That was what I was also thinking.
 
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Old Apr 8, 2019 | 07:19 PM
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My 6.0 did the same thing when the headgaskets went south.are you getting any puking from the degas tank?
 
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Old Apr 9, 2019 | 07:25 AM
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Originally Posted by KIDkiser
My 6.0 did the same thing when the headgaskets went south.are you getting any puking from the degas tank?
So did mine, that's an early sign of head gasket failure. I did all of the above and got my answer when I pulled my heads.
 
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Old Apr 9, 2019 | 09:08 AM
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Perhaps you could do a coolant pressure test as well. There is plenty of info on this on the forums.

Rob
 
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Old Apr 9, 2019 | 03:05 PM
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From: Spanaway
I think the least amount work step would be just to check the coolant level and coolant temp.
 
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Old Apr 9, 2019 | 05:29 PM
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Originally Posted by Yahiko
I think the least amount work step would be just to check the coolant level and coolant temp.

Simple and cheap checks are always the best way to start.
 
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Old Apr 9, 2019 | 08:38 PM
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From: Spanaway
Originally Posted by 69cj
Simple and cheap checks are always the best way to start.
So true. I find that it's best to not bother the Check Book/Credit Card holder unless really needed.
 
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