Take a deep breath, relax, one thing at a time.
TEMPERATURE SENDING UNIT
The temperature sending unit should not be that difficult to remove...
Drill/Drill bits and an Easy-Out.
Amazing deals on this 10Pc Set Screw Extractor at Harbor Freight. Quality tools & low prices.
www.harborfreight.com
Testing the gauge and wiring is very simple.
1)Remove the single wire connector from the sending unit.
2)Connect a jumper wire to the metal terminal in the harness connector and a known good ground.
3)Turn the key to the "on" position.
4)The gauge needle should move all the way to "Hot".
5)If it does, replace the sending unit.
6)If it does not the issue is with the wiring, instrument cluster or gauge.
NOTE; The temp gauge in these cars is not accurate, the needle/gauge reading will read differently in cold and hot weather, this is normal due to the placement of the temperature sending unit in the block.
Chrysler even issued a TSB about "Gauge Fluctuation" in cold weather.
RADIATOR
If this is a 2.2L VNT you are not going to find a radiator, it is discontinued by Mopar, Valeo (the original manufacturer) stopped producing them years ago and the aftermarket never made them. (only 900 VNT's were produced, 1990 only)
When I needed one a radiator shop we dealt with found one for me in upstate N.Y., that was 15 years + ago.
The only radiators that will be listed are for the 2.5L turbo without an intercooler, the intercooler on the 2.2L VNT bolts to and supports the L/S (driver side) of the radiator.
My suggestion would be open a thread in the "Parts Wanted" section, be sure to list that it is a 2.2L VNT.
The Mopar part # for the VNT radiator is...
4401674, it fits 1990 Daytona, Lebaron and TC Maserati (G/J/Q Body)
Here are two listings for used VNT radiators.
ARIZONA PARTS (Site User Name is "Marty Mopar, has been on TD for years)
4401674 are listed here. 1 found at 1 seller. View now.
www.rearcounter.com
CAR-PARTS.COM (A listing of junkyards across the country, if looking for the site make sure you place the hyphen (-) between car and parts or you will get the wrong site)
If you have any other questions, need info or assistance Please feel free to ask.