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S10 Air Flow Problems

HogWinslow on Thu July 07, 2011 12:00 PM User is offline

Year: 2004
Make: Chevy
Model: S10
Engine Size: 4.3L
Refrigerant Type: 134A
Ambient Temp: 70
Pressure Low: 30
Pressure High: 160
Country of Origin: United States

2004 Chevy S10



185,000 miles

High Side reading is 160

Low Side reading is 30

Outside Temp is 70

I've never had A/C problems in the past. The air blew hard and was ice cold. About a week ago I noticed that the air flow seemed to get stronger and then lessen. It was no big deal, I still had A/C.

Well it has gotten worse. Now it goes from tons of air flow to none. I live in the mountains and I noticed that it reacts to the throttle position. When I go up the mountain and my foots into the throttle I get little air flow. But when I go down the mountain and I'm on the brakes I get good airflow. Last night I used the defroster to clean the windshield and it wouldn't put all the airflow to the windshield. It was still putting a good amount of flow to the dash vents.

I've read in past posts that somehow the 4X4 can effect the vacuum in the A/C. For the past two years I had a problem getting the 4X4 to lock in. About six months ago I engaged the 4X4 in the driveway and it made a huge bang so loud my wife came running out of the house to see what happened. I haven't had a problem with it since.

Any ideas on where to start?


GM Tech on Thu July 07, 2011 2:06 PM User is offline

Black vacuum line is cracked or broken near the check valve-- trace from vacuum reservoir back to intake port....

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Edited: Thu July 07, 2011 at 2:06 PM by GM Tech

HogWinslow on Sun July 10, 2011 1:27 AM User is offline

Come to think of it, the truck is showing codes for a leak in the vent (evap) system of the fuel tank. I think it's a P0049. Would this have anything to do with the vaccum leak?


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