2004 Pontiac Montana Questions

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Fan just stopped working all together. No fuse issues or relays burnt either
I've replaced water pump heater core thermastat radiator put bars in it Incase of cracked head gasket but it keeps running hot and dying help please
While driving my RPM went up and my van stuttered a little. It mostly happened after a complete stop and then pushing on the gas. It also happened while pulling in to parking lot. What causes this?
Can I recharge my A/C or do I need to let a mechanic do that? And if I can, how do I get the freon and how do I charge it?
On a drive in real bad rain all of a sudden my fuel gauge acted up. First it went to low then full. Now its stuck on full and service engine light on?!? It drove fine unsure what it could be.
I tested the brake light wire at the tail light and there was no power when i pressed on the brakes. I was hooking up a trailer and convertor all the other lights work on the car and trailer. I disconnected the brake light wire from the convertor and tested the wire with a test light to confirm there is no power on the wire
Did a scan and it said it was intermittent high voltage to the MAP sensor. Replaced sensor and still has the same problem. Took it back to get a scan again and same fault pops up. Was told it could be a leaky vacuum hose. When trying to start it sounds like it has a misfire. Sometimes it will be rough for a second or two after starting then go away. There is no problems once its running.
Possible cable problems as there was slack cable hanging out at back of door opening
I have recently had a used instrument cluster installed into my 2004 Montana van. Now my radio says "locked". How do i get rid of this lock and have my radio back on?
The van runs great once you can get it started.
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