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Rob, when the battery is disconnected for any reason a couple of things happen, and frankly it's a design error on the GMT360 platform (Envoy/Trailblazer). Your mechanic did not make an error here. Issue #2, your vent actuators blew out when the battery was re-connected back up, it happens, it's common. Issue # 1 is a little more complicated. The flashing light means misfire, is a seperate issue and a coincidence. Pull the codes out with a scanner and report back, may be bad coil pack, happens and is common. Idle problem and starting to die is an easy fix, betting it only happens when the AC or defrost is on. Disconnect fuse #10 and #28 under the hood. Remove the throttle body and clean it with a sensor safe spray like Seafoam. Drive it around for the computer to relearn the newly cleaned throttle body. Idle problem will be fixed.
Throttle body needs to be cleaned, make sure both front side and rear side are cleaned thoroughly. Also, disconnect battery while performing cleaning, this will reset computer and allow it to relearn to the newly cleaned throttle body.
Sounds like you may have disconnected the battery. Does the rough idle only happen when the defroster or A/C is on? If so clean your throttle body with throttle body cleaner with the battery disconnected. When finished, drive it for 5 or so miles with the defroster / AC off to let the computer relearn the settings. This will solve your problem.
Sounds like ac compressor is dragging.It might be that rpm is to low also.Step on the accelarator and if you have a tach bring rpm up to 700 to 800 in drive which is were it should run with ac on. With ac off rpm should read around 600 in drive.
if the compressor works and your freon is charged it may be the blower flapper door....disconnect battery for 10 minutes and then re-connect to reset the electronics that control the flapper
TRY DISCONNECTING THE BATTERY FOR 5 MINUTES AND SEE IF IT COOLS AGAIN, SOUNDS LIKE A TEMP CONTROL BLEND DOOR PROBLEM. DISCONNECT THE NEG CABLE OF THE BATTERY.
tom disconnect the battery for 5 minute hook it up and try it if ac work sometime computer shot out you disconnect and it reset the computer it hapen to me on my 98 540 good luck pierre
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