# Car heater acting really weird **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** mini, coopers\ **Created:** [December 2, 2017, 2:22am UTC](https://community.cartalk.com/t/car-heater-acting-really-weird/109901 "2017-12-02T02:22:26Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![pdenton20](https://avatars.discourse-cdn.com/v4/letter/p/cc9497/32.png) [@pdenton20](https://community.cartalk.com/u/pdenton20)\ **Post date:** [December 2, 2017, 2:22am UTC](https://community.cartalk.com/t/car-heater-acting-really-weird/109901/1 "2017-12-02T02:22:27Z")
Car heater acting really weird. I already know my heater core is plugged so this is really just more of a curiosity thing but the driver side vents blow Luke warm air on low but the passenger side vents blow cold. What would cause this? ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [December 2, 2017, 2:23am UTC](https://community.cartalk.com/t/car-heater-acting-really-weird/109901/2 "2017-12-02T02:23:33Z")
> [@pdenton20](#): > > What would cause this? A plugged heater core. 😜 ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [December 2, 2017, 2:28am UTC](https://community.cartalk.com/t/car-heater-acting-really-weird/109901/3 "2017-12-02T02:28:00Z")
Another possibility is one or more of the vent doors that direct the path of the hvac air flow are not working. On newer cars those are often small electro-mechanical actuators, servos, and who’s failures – not just in minis but many makes of cars – are a frequent source of complaints here. I wouldn’t make sense to presume that’s the problem of course until the heater core is working. ---
**Author:** ![pdenton20](https://avatars.discourse-cdn.com/v4/letter/p/cc9497/32.png) [@pdenton20](https://community.cartalk.com/u/pdenton20)\ **Post date:** [December 2, 2017, 2:49am UTC](https://community.cartalk.com/t/car-heater-acting-really-weird/109901/4 "2017-12-02T02:49:05Z")
Right. It was just a curiosity question mostly. Usually I though when a heater core went out it affected all of the air flow and not just one side lol ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [December 2, 2017, 2:56pm UTC](https://community.cartalk.com/t/car-heater-acting-really-weird/109901/5 "2017-12-02T14:56:19Z")
why wont you change the heater core if it is plugged? maybe the tech could look at the blend doors at the same time ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [December 3, 2017, 1:02am UTC](https://community.cartalk.com/t/car-heater-acting-really-weird/109901/6 "2017-12-03T01:02:29Z")
Sometimes a blocked heater core can be reversed flushed and get it working again. A diyer could figure out a way to hook up a garden hose so the flow – accessed at the firewall – ran through the heater core backward. Could be a big, drenching, messy job though, especially if done in the dead of winter… ---
**Author:** ![pdenton20](https://avatars.discourse-cdn.com/v4/letter/p/cc9497/32.png) [@pdenton20](https://community.cartalk.com/u/pdenton20)\ **Post date:** [December 7, 2017, 2:09am UTC](https://community.cartalk.com/t/car-heater-acting-really-weird/109901/7 "2017-12-07T02:09:09Z")
I’m going to. Just don’t have the money right now. Dealers want way too much to do it and haven’t found anyone else yet who will do it