# 2009 MDX making noise like pressure releasing **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [November 23, 2015, 4:33am UTC](https://community.cartalk.com/t/2009-mdx-making-noise-like-pressure-releasing/91788 "2015-11-23T04:33:34Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![amb2k](https://avatars.discourse-cdn.com/v4/letter/a/d26b3c/32.png) [@amb2k](https://community.cartalk.com/u/amb2k)\ **Post date:** [November 23, 2015, 4:33am UTC](https://community.cartalk.com/t/2009-mdx-making-noise-like-pressure-releasing/91788/1 "2015-11-23T04:33:34Z")
I have a 2009 Acura MDX. This morning I was sitting in my car for a few minutes after turning it on. All of the sudden I heard a very loud noise like air pressure being released. Then there was white smoke coming into the cabin that smelled like burnt rubber. I turned off the car then turned it back on, and again this sound began after it idled for a couple minutes. Then my husband came home from work to check it out, and of course it did t do it. But we think the exhaust smoke may be a little whiter than normal and has a slight burnt smell to it. Any suggestions would be greatly appreciated. Thank-you! ---
**Author:** ![amb2k](https://avatars.discourse-cdn.com/v4/letter/a/d26b3c/32.png) [@amb2k](https://community.cartalk.com/u/amb2k)\ **Post date:** [November 23, 2015, 4:34am UTC](https://community.cartalk.com/t/2009-mdx-making-noise-like-pressure-releasing/91788/2 "2015-11-23T04:34:43Z")
Btw the sound lasted for about a second, stopped, then continued every 10 seconds or so ---
**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 23, 2015, 4:48am UTC](https://community.cartalk.com/t/2009-mdx-making-noise-like-pressure-releasing/91788/3 "2015-11-23T04:48:18Z")
One of two things have happened. Either the heater core or the evaporator for the AC system has ruptured. Tester ---
**Author:** ![amb2k](https://avatars.discourse-cdn.com/v4/letter/a/d26b3c/32.png) [@amb2k](https://community.cartalk.com/u/amb2k)\ **Post date:** [November 23, 2015, 5:02am UTC](https://community.cartalk.com/t/2009-mdx-making-noise-like-pressure-releasing/91788/4 "2015-11-23T05:02:07Z")
Thank you so much. My husband is convinced it’s the head gasket (he tends to be a fatalist and assume the worst) any chance it could be that? ---
**Author:** ![MY\_2\_CENTS](https://avatars.discourse-cdn.com/v4/letter/m/22d042/32.png) [@MY\_2\_CENTS](https://community.cartalk.com/u/MY_2_CENTS)\ **Post date:** [November 23, 2015, 6:55am UTC](https://community.cartalk.com/t/2009-mdx-making-noise-like-pressure-releasing/91788/5 "2015-11-23T06:55:12Z")
It’s not the head gaskets(s). I agree with @Tester on this. ---
**Author:** ![knfenimore](https://avatars.discourse-cdn.com/v4/letter/k/9fc348/32.png) [@knfenimore](https://community.cartalk.com/u/knfenimore)\ **Post date:** [November 23, 2015, 5:29pm UTC](https://community.cartalk.com/t/2009-mdx-making-noise-like-pressure-releasing/91788/6 "2015-11-23T17:29:12Z")
If it smelled like burnt rubber, it oil that spewed. Heater core would give a sweet smell. A/C hose or oil sensor would be my guess. You’ll need to have it towed, because leaking oil is a fire hazard. ---
**Author:** ![amb2k](https://avatars.discourse-cdn.com/v4/letter/a/d26b3c/32.png) [@amb2k](https://community.cartalk.com/u/amb2k)\ **Post date:** [November 23, 2015, 6:11pm UTC](https://community.cartalk.com/t/2009-mdx-making-noise-like-pressure-releasing/91788/7 "2015-11-23T18:11:08Z")
Thanks so much - it didn’t smell like burnt oil, different smell than that - I know it’s hard to describe smells. But just dropped it off at the shop, I will update when I hear what it is. ---
**Author:** ![amb2k](https://avatars.discourse-cdn.com/v4/letter/a/d26b3c/32.png) [@amb2k](https://community.cartalk.com/u/amb2k)\ **Post date:** [November 23, 2015, 10:05pm UTC](https://community.cartalk.com/t/2009-mdx-making-noise-like-pressure-releasing/91788/8 "2015-11-23T22:05:32Z")
Apparently the AC relief valve blew and coolant got on the frame causing the smoke. Thanks for your help!