Location of engine # of 04 trailblazer ext with 5.3 v8

I found this

Ok, do the following procedure if it does not work try it again with a new key if problem still exists the ignition switch/passlock sensor needs to be replaced then the following procedure will need to be performed again.

1. Turn key into on position with engine off.
2. Bump key into start position for a second without trying to start it and leave key in on position.
3. Leave key in on position for at least 10 minutes and security light will turn off.
4. Turn key off and wait 5 seconds.
5. Repeat steps 1-4 2 more times for a total of 3 times/30 minutes
6. Vehicle should now start.

This vehicle is not equipped with a cabin filter

Possible that the fluid pump in the transmission is going bad.
Best bet is to take it to a reputable transmission shop and have it diagnosed.

I’m happy to help further over the phone at https://www.6ya.com/expert/jason_00b31cc8f593773a

4.2l engine cmp sensor located front right corner of the engine cylinder head. 5.3l engine cmp sensor location front of the engine block just above the crankshaft.

it has a chain if it is a v8 or v6.

yes there are 12, one for each valve if u have the 6 cylinder 4.2 liter and 16 if u have the V8 5.3 liter.

This problem is caused by a defective fuel gauge sending unit, it is located in the gas tank.

Is it possible you could get to them from the outside behind tire? Not sure just a thought.

On most GM V6/V8 engines the oil sending unit is on top of the engine near the firewall possibly under/behind the distributor. Look at the extreme rear of the intake manifold. On some others it is mounted near the oil filter. If you have a light it will just be a single wire. If you have a true gauge it may have a very small hose/line connected to it.

heat and air blower is not working on setting number 5