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most times-a backfire is caused by being slightly out of time or bad valves--not sure of your year make or model of car. Sometimes the timing will jump and cause the firing order to be wrong and you'll get a backfire and the car will run ruff
Maybe, maybe not, It's most likely a bad rear seal or worn main bearings but check the oil filter just to be safe. Sometimes things go wrong when changing the oil filter that can cause similar symptoms.
1) old gasket left behind.
2) cross threaded filter.
3) loose filter.
4) damage gasket or defective new filter.
the a/c clutch should cycle on and off 4 to 7 times/miunte depending on air temperature. if it's cycling n & off several times/minute, you are probably low on R134a. Add a can to see if the cycling lessens. get a hose kit with a gauhe on it that tells you if you are getting overcharged.
Test the fan by unplugging it, and jumping off the battery. This will tell you if the fan motor itself is working or not. If it works, post back and I'll tell you how to check the engine codes, a sending unit on the engine could be nfg and causing the fan to not come on. If the fan doesn't come on when jumped, replace the fan motor.