# 2017 Infiniti QX50 - No heat

**URL:** <https://community.cartalk.com/t/2017-infiniti-qx50-no-heat/172026>\
**Category:** Maintenance/Repairs\
**Tags:** infiniti\
**Created:** [November 6, 2020, 2:41pm UTC](https://community.cartalk.com/t/2017-infiniti-qx50-no-heat/172026 "2020-11-06T14:41:40Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Meek](https://avatars.discourse-cdn.com/v4/letter/m/ce73a5/32.png) [@Meek](https://community.cartalk.com/u/Meek)\
**Post date:** [November 6, 2020, 2:41pm UTC](https://community.cartalk.com/t/2017-infiniti-qx50-no-heat/172026/1 "2020-11-06T14:41:41Z")

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Cool air is coming out of the vents when I put the heat on

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**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [November 6, 2020, 6:20pm UTC](https://community.cartalk.com/t/2017-infiniti-qx50-no-heat/172026/2 "2020-11-06T18:20:26Z")

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I suspect the control valve is stuck. If your Infiniti is still under the bumper-to-bumper warranty have a dealer look at it.

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**Author:** ![oldnotdeadyet](https://avatars.discourse-cdn.com/v4/letter/o/a6a055/32.png) [@oldnotdeadyet](https://community.cartalk.com/u/oldnotdeadyet)\
**Post date:** [November 6, 2020, 9:06pm UTC](https://community.cartalk.com/t/2017-infiniti-qx50-no-heat/172026/3 "2020-11-06T21:06:06Z")

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This symptom could be caused by very low coolant levels. If that turns out to be true, let the dealer diagnose why, and then fill and bleed the system.

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**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [November 7, 2020, 10:41pm UTC](https://community.cartalk.com/t/2017-infiniti-qx50-no-heat/172026/4 "2020-11-07T22:41:18Z")

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I thought of low coolant but the OP didn’t mention overheating or running hot. There may be air trapped in the heater core though.

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [November 8, 2020, 7:58pm UTC](https://community.cartalk.com/t/2017-infiniti-qx50-no-heat/172026/5 "2020-11-08T19:58:54Z")

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The HVAC system in your vehicle has two separate blend doors. One for the drivers side, and one for the passenger side.

Not one common blend door.

The blend doors are what control whether hot or cold air enters the cabin.

The two things that control the blend door positions are the HVAC control module,

![image](https://global.discourse-cdn.com/cartalk/original/3X/a/b/ab8b2591a76360625d4ffb8e9c4d47b57919c286.png)

And the body control module,

> **[5 Common Symptoms of a Failing Body Control Module (BCM) - Module Experts](https://moduleexperts.com/5-common-symptoms-failing-body-control-module-bcm/)**
>
> If your BCM malfunctions, you will notice a negative effect on the operation of your vehicle. Watch out for these symptoms.

Unfortunately, the only way to determine if either of these is the cause of the problem is with a factory level scanner.

Tester