# Civic a/c compressor

**URL:** <https://community.cartalk.com/t/civic-a-c-compressor/74335>\
**Category:** Maintenance/Repairs\
**Tags:** civic, honda\
**Created:** [August 28, 2012, 1:44pm UTC](https://community.cartalk.com/t/civic-a-c-compressor/74335 "2012-08-28T13:44:31Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![4L60E](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/4l60e/32/2560_2.png) [@4L60E](https://community.cartalk.com/u/4L60E)\
**Post date:** [August 28, 2012, 1:44pm UTC](https://community.cartalk.com/t/civic-a-c-compressor/74335/1 "2012-08-28T13:44:31Z")

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I put a used compressor on a 98 civic and when the a/c is off, pressure is over 100psi. (low side). When a/c is on, pressure falls slowly and sometime I have speed engine up get it to 45psi. Do you think compressor is weak or bad expansion valve?

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**Author:** ![GSragtop](https://avatars.discourse-cdn.com/v4/letter/g/7c8e57/32.png) [@GSragtop](https://community.cartalk.com/u/GSragtop)\
**Post date:** [August 28, 2012, 3:26pm UTC](https://community.cartalk.com/t/civic-a-c-compressor/74335/2 "2012-08-28T15:26:11Z")

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Your low side pressure should fall when the AC is running. Just like the high side pressure should go up. Is the air getting cold??