Ac odd issue
Thread Starter
Instructor
Joined: Aug 2021
Posts: 140
Likes: 11
From: Chicago
Ac odd issue
Hey guys,
Got a strange one. Checked my fan running perfectly. Both, hi and low side pressures within spec. Freon filled to 1.1 lbs.
At the evap core. It’s 34 degrees scanning with temp laser. Out of the vents it’s 68 degrees with dials set to 60.
Seems to get colder when moving. Kinda stumped on this. Tested the blender doors and they seem to all be working… unless they are slipping.
Only thing I haven’t done is replace that in cabin temp sensor, outside temp sensor or engine coolant sensor since I think all those are tied to the ac.
Also, ac is considerably colder when car is cold. If I shut it off and go run some errands. It struggles to get to a cool temperature. Unless driving for some time on expressway. Above 80 degrees out the car ac performance is also degraded.
Any help appreciated before I throw in the towel.
Got a strange one. Checked my fan running perfectly. Both, hi and low side pressures within spec. Freon filled to 1.1 lbs.
At the evap core. It’s 34 degrees scanning with temp laser. Out of the vents it’s 68 degrees with dials set to 60.
Seems to get colder when moving. Kinda stumped on this. Tested the blender doors and they seem to all be working… unless they are slipping.
Only thing I haven’t done is replace that in cabin temp sensor, outside temp sensor or engine coolant sensor since I think all those are tied to the ac.
Also, ac is considerably colder when car is cold. If I shut it off and go run some errands. It struggles to get to a cool temperature. Unless driving for some time on expressway. Above 80 degrees out the car ac performance is also degraded.
Any help appreciated before I throw in the towel.
Last edited by Petera90; Aug 23, 2023 at 08:00 AM.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,416
Likes: 3,972
From: Cape Coral, Florida
Sounds like restricted airflow across the condenser (gets colder when moving)…I’d also make sure it’s clean of sand and dirt or other debris…good idea to clean it maybe once every 2 years with air or water.
Safety Car
Joined: Aug 2017
Posts: 4,916
Likes: 2,322
From: Etobicoke (Toronto) Ontario
Just an observation, but the effectiveness of the cooling ability of your AC system is dependent upon the rate of heat exchange provided by the condenser. And the condenser sits up front, so it’s the first to get clogged with leaves, bugs, dirt, or anything else sucked up in there. Providing more air flow helps that situation somewhat, which is consistent with what you are observing at with higher speeds.
EDIT: c5diag beat me to it on that point
EDIT: c5diag beat me to it on that point
Melting Slicks
Joined: Apr 2019
Posts: 2,495
Likes: 1,163
From: Northern Wisconsin
If you're seeing 34 degrees at the evaporator, that is plenty cold, so the system is working. I know you said you investigated the blender doors, but it seems to me that the problem is there. Either a problem with the blender door itself, or the controls for the blender door.
Melting Slicks
Joined: Apr 2019
Posts: 2,495
Likes: 1,163
From: Northern Wisconsin
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
Thread Starter
Instructor
Joined: Aug 2021
Posts: 140
Likes: 11
From: Chicago
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,416
Likes: 3,972
From: Cape Coral, Florida
Thread Starter
Instructor
Joined: Aug 2021
Posts: 140
Likes: 11
From: Chicago
Thread Starter
Instructor
Joined: Aug 2021
Posts: 140
Likes: 11
From: Chicago
Cleaned the condenser and a **** ton of dust and leaves came out. The center vents read as follows: 56 degrees for passenger side. 63 for driver side.
Driver side vent by door 56 degrees. Passenger side vent by door 56.
all actuators seem to be working. Just don’t understand the center vents difference in temp. Unless there’s a vent seal leak…
Driver side vent by door 56 degrees. Passenger side vent by door 56.
all actuators seem to be working. Just don’t understand the center vents difference in temp. Unless there’s a vent seal leak…
