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new ac compressor taking all power


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Mrusson
New User

Nov 6, 2018, 8:39 AM

Post #1 of 5 (105 views)
new ac compressor taking all power Sign In

We just replaced the ac compressor and now when it is engaged, the vehicle struggles when idling. It almost dies, recovers, almost dies, recovers, and then dies. If the ac is not engaged, the vehicle idles normally. When I asked my mechanic about it, he didn't have an answer and just said that the compressor must just be taking all the power. So, did I get a bad compressor or do I need a new mechanic? How best do I solve this issue?
The vehicle is a 2002 Oldsmobile Bravada.

**edited to add** my mechanic changed this out, not us doing a diy. We didn’t even make it out of the parking lot when we went back and asked about it. He just was stumped and said it didn’t have a problem when they tested it afterwards. Just told us to run it through 20-26 drive cycles and then if it is still doing it, bring t back and test for something else.


(This post was edited by Mrusson on Nov 6, 2018, 3:36 PM)


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 6, 2018, 8:58 AM

Post #2 of 5 (102 views)
Re: new ac compressor taking all power Sign In

? If you just replaced compressor and it was in fact burned out you can't just replace only that or it would "grenade" again almost right away. It's a whole procedure to diagnose to decide and still do every last thing right or expect instant failure up to worse off than before you did it!
So if that's what happened read this you probably need to start over again already!
http://autoforums.carjunky.com/...SOR_FAILURE_P116082/


If you really did this all right and it is the reason for excessive strain that too isn't good needs diagnosing again.


Normal would be the engine idle for the load added would automatically adjust to cover it almost not noticed by you. If anything messed with that any which way idle would normally drop isn't supposed to you have another problem especially if it can work properly now and all was done right.


Another is opinion: Even all done properly if the compressor was a reman not new it's a total crap shoot AYOR you can lose your shirt if you really need A/C you aren't going to like this mess,


T
Just add the proper charging procedure almost nobody follows except a pro. Must hold a vacuum fully. Oil replaced or system flushed and ready with new oil, compressor spun with oil prior to first run. Charge must be by the ounce not often mentioned how important that is an overcharge will kill a good system and way too low also for lack of oi. Not DIY friendly without comprehensive understanding of what you are doing. Another read on charging...…..
http://autoforums.carjunky.com/..._A/C_SYSTEMS_P45460/


Again mistakes easily set you back to worse than if you never touched it!



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 9, 2018, 12:23 AM

Post #3 of 5 (58 views)
Re: new ac compressor taking all power Sign In

mrusson: Quote your edit AFTER I posted? That's a reply comment now sequence is out of order.
Quoted ">
**edited to add** my mechanic changed this out, not us doing a diy. We didn’t even make it out of the parking lot when we went back and asked about it. He just was stumped and said it didn’t have a problem when they tested it afterwards. Just told us to run it through 20-26 drive cycles and then if it is still doing it, bring t back and test for something else.


(This post was edited by Mrusson on Nov 6, 2018, 5:36 PM) <"
It's all fine now just smacks of passing the buck and YES would say you need a new mechanic asked up top post. The snag now is what to do about what this cost you so far to the first person or place and what the end fix will cost due to improper work and the comment to just drive it around like you'll forget it all? Real A/C work isn't even for all techs or for all shops. It's "seasonal" work for so many places not worth the investment unless that's all you want to do which is a lot of nothing off season!


Tom



Discretesignals
Ultimate Carjunky / Moderator
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Nov 9, 2018, 12:51 PM

Post #4 of 5 (46 views)
Re: new ac compressor taking all power Sign In

What is the high side pressure doing? If it is too high, it will drag the engine down. I think you need to talk to the shop owner.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Nov 9, 2018, 12:53 PM)


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 9, 2018, 2:51 PM

Post #5 of 5 (36 views)
Re: new ac compressor taking all power Sign In

DS, OP came back to add that he/she didn't do this at all. Just suggests now only compressor so just sucked up junk right away already struggling. No mention of other stuff done or how failed just a "compressor replaced" and engine is fighting with it? That's all was my guess you can't just do that if it burned up would take out condenser and more as we know OP did ask if he needed a "new" mechanic. Answer should have been just "YES" from me,


Tom






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