I've always done most of the work on my cars myself, and this forum has definitely helped out quite a bit! In addition to the usual brake jobs, oil changes, tune ups, etc., this forum has helped me to replace my bearing hubs, convinced me to add a trans cooler, and install a front receiver hitch. My next job to tackle is the HVAC mode actuator. In all my wildest dreams, I would have never thought that replacing my battery would have led to the actuator being damaged. Who would have known? Anyway, thanks everyone for the help you've offered me and continue to give to each other.
This forum rocks!
- Thread starter jfkmk
- Start date
Welcome! Nobody ever guesses right off the bat that:
1) A battery disconnect or discharge can cause HVAC issues
2) A battery disconnect can cause fluctuating idle that sometimes stalls the engine, but goes away when the AC is off, that you can fix for $4 worth of throttle body cleaner
3) Deteriorating motor mounts can cause a 10 Hz vibration at idle that's worse in DRIVE but goes away in NEUTRAL
4) GM would leave a red wire with a ring lug hanging in mid air near the fuse block with ZERO documentation what it does
5) That a scan tool failure can be caused by front fuse #13 that runs the accessory outlet
6) You have to change your transfer case fluid every 50K miles or you're looking at a world of $$ hurt
7) A numbnutz can try to jump start you, use attractively positioned studs with RED and BLACK wires near the battery, but they're really both 12V and the idiot just blew your 125A megafuse that takes out your radio and interior lights, but lets you start the engine when they jump start you properly to the battery terminals
8) Putting LED lamps in backwards can blow a stupidly named fuse (TBC) under the rear seat that will take out half of your interior lights
9) That a cold start might leave you with only 11V from the battery to run your vehicle for up to 30 seconds before the alternator takes over with a rush and gives you the 14V you're expecting
10) A HVAC blower component can fail in a way that your blower runs on after you take the key out of the ignition, and you have to search for the right fuse to prevent this from draining your battery in a few hours
11) You have essentially a NOISY-ASS shop vac under the driver's seat (on the frame rail) that runs for 30 seconds on a cold start, and it it fails, it will honk off the check engine light
12) Thermostats often fail in the open position, leaving you running too cold, and if left unfixed, can cost you a $500 catalytic converter
There are more - this is just the highlights of the GMT360 platform.
1) A battery disconnect or discharge can cause HVAC issues
2) A battery disconnect can cause fluctuating idle that sometimes stalls the engine, but goes away when the AC is off, that you can fix for $4 worth of throttle body cleaner
3) Deteriorating motor mounts can cause a 10 Hz vibration at idle that's worse in DRIVE but goes away in NEUTRAL
4) GM would leave a red wire with a ring lug hanging in mid air near the fuse block with ZERO documentation what it does
5) That a scan tool failure can be caused by front fuse #13 that runs the accessory outlet
6) You have to change your transfer case fluid every 50K miles or you're looking at a world of $$ hurt
7) A numbnutz can try to jump start you, use attractively positioned studs with RED and BLACK wires near the battery, but they're really both 12V and the idiot just blew your 125A megafuse that takes out your radio and interior lights, but lets you start the engine when they jump start you properly to the battery terminals
8) Putting LED lamps in backwards can blow a stupidly named fuse (TBC) under the rear seat that will take out half of your interior lights
9) That a cold start might leave you with only 11V from the battery to run your vehicle for up to 30 seconds before the alternator takes over with a rush and gives you the 14V you're expecting
10) A HVAC blower component can fail in a way that your blower runs on after you take the key out of the ignition, and you have to search for the right fuse to prevent this from draining your battery in a few hours
11) You have essentially a NOISY-ASS shop vac under the driver's seat (on the frame rail) that runs for 30 seconds on a cold start, and it it fails, it will honk off the check engine light
12) Thermostats often fail in the open position, leaving you running too cold, and if left unfixed, can cost you a $500 catalytic converter
There are more - this is just the highlights of the GMT360 platform.
Geeze, Roadie, you're scaring me!
At least with the forum, I'll be able to more easily diagnose and repair my Envoy. Good thing I got it at a good price, or it wouldn't be worth all this hassle.
At least with the forum, I'll be able to more easily diagnose and repair my Envoy. Good thing I got it at a good price, or it wouldn't be worth all this hassle.
