Notices
Maintenance & Repair 350Z up keep and diagnosing/fixing problems

Help diagnose A/C problem

Old 06-11-2018, 07:35 AM
  #21  
Z33Garage
Registered User
iTrader: (3)
 
Z33Garage's Avatar
 
Join Date: Jun 2011
Location: Orlando
Posts: 2,730
Received 20 Likes on 14 Posts
Default

I have been scouring the FSM and cannot find the self diagnose procedure. All I find is the SES light procedure, which I am assuming is not the correct one. Any links to the procedure and the faults?
Z33Garage is offline  
Old 06-11-2018, 01:52 PM
  #22  
Z33Garage
Registered User
iTrader: (3)
 
Z33Garage's Avatar
 
Join Date: Jun 2011
Location: Orlando
Posts: 2,730
Received 20 Likes on 14 Posts
Default

NM FOUND IT!

2005 350z
- High side (98 psi) (calls for w/ amb temp 152-194psi) idle
-low side (45psi) (calls for w/ amb temp 29-42psi) idle
-Pressures do not change with engine RPM
-BLOWS hot air
Compressor clutch works, in cabin blowing motor turns on, AC control switches work, all AC fuses and relays work.
-No leaks are found using UV light
-Compressor does not feel warm to the touch indicating mechanical binding of some sort.
-condenser is clean and free of debre
-System became hotter and hotter over the course of a week, till it finally blows only hot air.

Any ideas? I am literally about to change it all.
Z33Garage is offline  
Old 06-12-2018, 08:23 AM
  #23  
MicVelo
350Z/370Z Tech Moderator
MY350Z.COM
 
MicVelo's Avatar
 
Join Date: Oct 2014
Location: Northern California
Posts: 7,146
Received 2,021 Likes on 1,456 Posts
Default

Originally Posted by Z33Garage View Post
NM FOUND IT!

2005 350z
- High side (98 psi) (calls for w/ amb temp 152-194psi) idle
-low side (45psi) (calls for w/ amb temp 29-42psi) idle
-Pressures do not change with engine RPM
-BLOWS hot air
Compressor clutch works, in cabin blowing motor turns on, AC control switches work, all AC fuses and relays work.
-No leaks are found using UV light
-Compressor does not feel warm to the touch indicating mechanical binding of some sort.
-condenser is clean and free of debre
-System became hotter and hotter over the course of a week, till it finally blows only hot air.

Any ideas? I am literally about to change it all.
I don't usually advocate "throw parts at it" but, it sounds like it might be temperature switch/sensor. Possibly ambient temp switch (up front, down low in front of radiator.) No guarantees but a faulty ATS can cause problems such as yours. Not too expensive a part to replace.
MicVelo is offline  
Old 06-12-2018, 10:26 AM
  #24  
zakmartin
Registered User
 
Join Date: Feb 2009
Location: Seattle, WA
Posts: 2,820
Received 503 Likes on 372 Posts
Default

Based on your description that it's stuck on blowing hot air only, it's either what Mic said or it's a stuck blend air door or bad blend air actuator. It could also be a faulty temperature dial (I believe you can test the resistance on the dial with an multimeter.) Hopefully, it's not a failed A/C amp.

Honestly, since the failure has been incremental, I'm placing my bets on the blend air door or actuator, because I've seen that happen a few times before.
zakmartin is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Lt_Ballzacki
Brakes & Suspension
18
03-21-2019 06:01 PM
Uriyo_
Exterior & Interior
21
11-06-2015 05:59 AM


Thread Tools
Search this Thread
Quick Reply: Help diagnose A/C problem


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: