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No fuse behind radio. Don't waist your time. Did you check fuses under the hood? Use a test light to check fuses easily. Do it with key in accessory position. Check to see if anything else quit working. Radios usually have a fuse for accessory and one for memory. Either will stop radio from working. (Sorry) if after market radio it will have fuse behind power plug behind radio.
If vents are controlled by vacuum a loss of vacuum would cause servos to go to a rest position and usually air only comes out of floor and defrost vents. Diesel engines need a vacuum pump because they unlike a gas engine have no or very little vacuum.
He's right if you brought it to me I would tell you I'm going to replace the regulator. I wouldn't waist time trying to fix.
Are you replacing the clutch discr or the clutch master cylinder? To remove master cylinder pop rod off of clutch pedal remove Bolts securing it to fire wall disconnect line. Take look at a new one you'll see what has to come off.
Your hot cold blend servo (actuator) is possibly bad. I believe the passenger servo is located on top of dash behind radio. The driver blend servo is at bottom of dash on passenger side of transmission hump. Try disconnecting battery negative cable and leave off for about 20 minutes. This will make system reboot if there's a communication failure. Worked for me a couple of times.
Don't forget the simplest. Check fuses!
Yea have a second opinion. Ask them if they did a compression test on it. If compression is within 10% compared to other cylinders chances are its not the head.
4.0l or 5.6l both have timing chains. 3 to be exact.1 primary and 2 camshaft chaines. With Nissan"s in particular if oil changes aren't done at proper intervals and wrong viscosity the primary chain tensioner goes bad causing excessive chain slack. Very costly. Depending on shop labor $800-$1000. Parts $300-$400
On this particular engine you have to disconnect the fuel line feed into the fuel rail. A proper fuel injection pressure tester should have multiple adapters to hook up to different systems. This Chrysler doesn't have a shrader valve.
You need to check if your Optima has a transponder chip in your key. If fault in system (bad antenna ring) security thinks someone is Trying to (hotwire) car and shuts down computer. Ie no ignition or fuel. Try spraying starting fluid in air box. If car runs no fuel. Make sure when key is turned on you hear fuel pump run for about 2 seconds then stop. If not check fuel pump relay.