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Title: Cool air at idle with heater on.
Post by: 396375 on November 07, 2017, 10:54:06 PM

My 2010 MKS has a problem with cool air coming in when the heater is on at idle.Once the car starts driving the heat comes in and everything is fine.I have replaced the blend door module behind the glove box.I'm thinking there is another one that is the problem.
Thanks

Title: Re: Cool air at idle with heater on.
Post by: SHOdded on November 08, 2017, 12:31:32 AM

Usually this is due to low coolant or perhaps an air pocket in the cooling system. Make sure the coolant is at or slightly above the COLD FULL mark when engine is off/at ambient.

Title: Re: Cool air at idle with heater on.
Post by: ZSHO on November 08, 2017, 06:58:10 AM

X2 - probably have an air pocket in the system.
Stat original ? Z

Title: Re: Cool air at idle with heater on.
Post by: Brucelinc on November 08, 2017, 09:04:50 AM

Very common issue. As Shodded said, add coolant to a bit ABOVE the cold full line when the engine is cold.

Title: Re: Cool air at idle with heater on.
Post by: Blackhawk on November 08, 2017, 09:50:29 AM

This, and keep doing it every couple days until it stops lowering.

Quote from: Brucelinc on November 08, 2017, 09:04:50 AM
Very common issue. As Shodded said, add coolant to a bit ABOVE the cold full line when the engine is cold.

Title: Re: Cool air at idle with heater on.
Post by: 396375 on November 08, 2017, 10:29:09 AM

Thanks guys.I'll give it a try.

Title: Re: Cool air at idle with heater on.
Post by: 396375 on November 09, 2017, 06:08:37 PM

3 Quarts later I have continuous heat.Thanks to all.

Title: Re: Cool air at idle with heater on.
Post by: SHOdded on November 09, 2017, 06:28:46 PM

Awesome! Enjoy.

Ecoboost Performance Forum

Ecoboost Performance => Troubleshooting, Maintenance, TSB Articles => Troubleshooting => Topic started by: 396375 on November 07, 2017, 10:54:06 PM