A/C Performance
A/C Performance Hello everyone. Was gonna pick your brain and see if you can help. I just moved down to TX and have low A/C performance witch I cant have down here 
First i dont feel like my blower motor is blowing hard enough. If i drive on the highway with max fan and a/c sometimes freezes. It just got a brand new evaporator so i know its not clogged and i just put in new blower motor and while replacing it i reached my hand inside to make sure no leaves and stuff was inside. Any way to make it blow harder? Maybe different squirrel cage that will fit it? I also get low to no A/C at idle, it will just start blowing warm air. Its 383 with decent cam in it and only runs 8psi vacuum on idle (11 or so highway). Is ac/heater core gate vacuum operated? how much does it need if it is? or my AC radiator needs cleaning? its a bit nasty. I know its a long post but thanks in advance for reading it. I just wanna be cool ��
First i dont feel like my blower motor is blowing hard enough. If i drive on the highway with max fan and a/c sometimes freezes. It just got a brand new evaporator so i know its not clogged and i just put in new blower motor and while replacing it i reached my hand inside to make sure no leaves and stuff was inside. Any way to make it blow harder? Maybe different squirrel cage that will fit it? I also get low to no A/C at idle, it will just start blowing warm air. Its 383 with decent cam in it and only runs 8psi vacuum on idle (11 or so highway). Is ac/heater core gate vacuum operated? how much does it need if it is? or my AC radiator needs cleaning? its a bit nasty. I know its a long post but thanks in advance for reading it. I just wanna be cool �� Last edited by sofixy89; Jul 9, 2017 at 02:48 PM.
The lack of vacuum may be inhibiting proper operation of the warm/cold flap. Seems plausible given that you have better performance of the system on the highway when the engine sees higher revs than at idle.
Can you hear the compressor cycling?
Can you hear the compressor cycling?
TECH Veteran
Joined: Dec 2008
Posts: 4,143
Likes: 61
From: Little Rock, AR
OP, if you don't have the proper tools/skills to check out the system, I would have it professionally evaluated. Even the proper amount of charge will affect how the system operates.
thanks for all the input. I will have pressures checked. Also installed the new cage from 2001 alero to give it a bit more flow. ( had to trim it and all kinds of stuff to fit but was worth it)
TECH Enthusiast
Joined: Jan 2013
Posts: 686
Likes: 76
From: Thibodaux LA
check to see if the coil is engaging on the compressor. mine will work intermittently. i put the scanner on it and it says coil is on meaning its sending voltage to it buy its not engaging. the clearance is probably too much. good luck on your findings
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On The Tree
Joined: Apr 2016
Posts: 168
Likes: 0
From: Wichita, KS
Lolz, my A/C is the removal of my t-tops and rolling down my windows. Almost positive my AC system has a leak. I was able to jumpstart the compressor with some 12v wire, then I put the refigerant in it but it won't hold any pressure at all. Any suggestions?