# 96 chevy Blazer trany burping

**URL:** <https://community.cartalk.com/t/96-chevy-blazer-trany-burping/38233>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet, transmissions, blazer\
**Created:** [October 17, 2009, 6:39pm UTC](https://community.cartalk.com/t/96-chevy-blazer-trany-burping/38233 "2009-10-17T18:39:10Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![jnalder](https://avatars.discourse-cdn.com/v4/letter/j/958977/32.png) [@jnalder](https://community.cartalk.com/u/jnalder)\
**Post date:** [October 17, 2009, 6:39pm UTC](https://community.cartalk.com/t/96-chevy-blazer-trany-burping/38233/1 "2009-10-17T18:39:10Z")

</div>

I have a 96 chevy Blazer; automatic and 4x4, that is building back pressure in the transmission and burping out the vent next to the dipstick. I’ve talked to a couple mechanics and had them drive it and they say the transmission is running well, they just don’t know why it is building backpressure. Two weeks ago I had the transmission flushed and the problem stopped until yesterday, now it is back at it. I’m ready to take it to a transmission specialist. I live in a rural area so that involves taking at least half a day off work. Does any one know what possible could be wrong and how I can fix this problem?

---

<div class="post-metadata">

**Author:** ![hd72mm](https://avatars.discourse-cdn.com/v4/letter/h/9fc29f/32.png) [@hd72mm](https://community.cartalk.com/u/hd72mm)\
**Post date:** [October 17, 2009, 8:51pm UTC](https://community.cartalk.com/t/96-chevy-blazer-trany-burping/38233/2 "2009-10-17T20:51:49Z")

</div>

Vent not working right, can it be unscrewed and cleaned?  
Even if it is building pressure it should be venting all the time not every once in awhile.

---

<div class="post-metadata">

**Author:** ![transman618](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/transman618/32/24_2.png) [@transman618](https://community.cartalk.com/u/transman618)\
**Post date:** [October 17, 2009, 10:25pm UTC](https://community.cartalk.com/t/96-chevy-blazer-trany-burping/38233/3 "2009-10-17T22:25:23Z")

</div>

Oil pump worn, trans overfilled, fluid contaminated with engine coolant. Definately let the trans shop look at it.

transman