# Car still overheating

**URL:** <https://community.cartalk.com/t/car-still-overheating/86367>\
**Category:** Maintenance/Repairs\
**Created:** [August 2, 2014, 5:03am UTC](https://community.cartalk.com/t/car-still-overheating/86367 "2014-08-02T05:03:15Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![auto-owner](https://avatars.discourse-cdn.com/v4/letter/a/50afbb/32.png) [@auto-owner](https://community.cartalk.com/u/auto-owner)\
**Post date:** [August 4, 2014, 2:43am UTC](https://community.cartalk.com/t/car-still-overheating/86367/21 "2014-08-04T02:43:32Z")

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pilotcar94  
_Also the 2k rpm drop I spoke of is at highway speeds_

**You mean every time your compressor kicks on, you drop 2K rpm, quickly? And thus lose all that speed?**

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**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\
**Post date:** [August 4, 2014, 3:24am UTC](https://community.cartalk.com/t/car-still-overheating/86367/22 "2014-08-04T03:24:13Z")

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If activating the A/C compressor actually causes the engine to bog by 2k RPMs on the highway then there has to be a system pressure problem with the high side being through the roof.  
No wonder the engine is overheating.

My suggestion is to follow Tester’s comment about checking the pressures with a gauge set. If the high side is getting into that 300-400 PSI range then there’s an issue with the expansion valve, clogged condenser, or overcharge of the system.

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**Author:** ![pilotcar94](https://avatars.discourse-cdn.com/v4/letter/p/5e9695/32.png) [@pilotcar94](https://community.cartalk.com/u/pilotcar94)\
**Post date:** [August 4, 2014, 4:48am UTC](https://community.cartalk.com/t/car-still-overheating/86367/23 "2014-08-04T04:48:48Z")

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Yes it loses power instantly. Also fan is new even added and extra cooling fan still doesnnt help. I think yall are right about the ac being messed up will bring it up to ac mechanic.

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**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\
**Post date:** [August 4, 2014, 5:08am UTC](https://community.cartalk.com/t/car-still-overheating/86367/24 "2014-08-04T05:08:09Z")

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So you’re turning 3000 rpms on the freeway

Then the ac compressor engages, and you’re turning 1000 rpms on the freeway

Did I get that correct?

[Previous page](https://community.cartalk.com/t/car-still-overheating/86367.md?page=1)