Heater does not work when the engine is idling?

2013 FORD F-350
188,457 MILES • 6.7L • V8 • TURBO • 2WD • AUTOMATIC
Avatar
JONATHAN CARINO
  • MEMBER
  • 3 POSTS
The truck listed above has a6.7 power stroke. The heater is not working while idling, only works when RPMs go up. The thermostat is good was just replaced and the radiators for both systems were replaced.
Dec 28, 2022 at 1:48 AM
Avatar
JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Hi,

It sounds like it is low on coolant. When the engine is cold, remove the radiator cap under the hood and see if the radiator is full.

https://www.2carpros.com/articles/car-heater-not-working

Let me know.

Joe
Dec 28, 2022 at 1:21 PM
Avatar
JONATHAN CARINO
  • MEMBER
  • 3 POSTS
the coolant is full and have done a vacuum fill to ensure no air is in the system and nothing, air is still cold, I forgot to add that at a certain point the coolant starts to rise excessively (viewing it at the degas bottle) and starts to overflow out the degas bottle.
Dec 28, 2022 at 9:59 PM
Avatar
JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Hi,

Does that happen if it is overheating, or does it happen at any temperature? I ask because that sounds like a head gasket issue. If compressed air is getting into the cooling system, this can happen. Do you notice any air bubbles in the coolant?

Take a look through this link and see if anything mirrors what you see. Also, let me know if the engine overheats.

https://www.2carpros.com/articles/head-gasket-blown-test

Let me know.

Joe
Dec 29, 2022 at 12:10 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle