Hey Ween,
I honestly wouldn't put another dime into it. The PT is known for being a trouble-prone vehicle. Once you pay to fix all of its current issues, a new batch will probably crop up. Your year model in particular seems to be the worst. Sorry.
Based on the current trade-in value of the car (around $3000), sinking $1800 into it seems like a bad idea.
In your first post, you stated they don't make them anymore, but in fact, they do. The 2010 model is available currently.
Here's a rough estimate of the trade-in amount:
https://www.kbb.com/used-cars/chrys...ion=fair&id=2084&category=wagon&mileage=37000
So, if you drop another $1800, you're going to have $4800 in a $3000 vehicle. If I were you, and I just loved PT Cruisers, I would take that beast to another dealer, take the $1800 and the car and use them for trade toward a 2010. You can buy the 2010 models for $14,000 or less with a little negotiation. Now you've got a brand new car, with a very low monthly payment ($175/month for 5 years against $9000 after trade-in/down payment).
I would never sink that much money into repairs for a car that's going to be basically worthless in a couple of years. Get the trade value out of it now.
Regarding your job situation, if you were to find yourself out of work in a year, and the car you have now DOES break down, you are not going to have reliable transportation while seeking out a new job, which is going to make finding that new job extremely difficult. A new car bought now would be covered under warranty.