I can't seem to unscrew the coolant reservoir cap

So you mean it actually unscrews like removing a bolt?

Thank you I will try unscrewing it tomorrow let you know results

Cleared the codes today used jumper and then pulled #1 fuse for about 15 sec. After I rescanned for new codes. Got the same codes as had before with one less that one was 15 cts signal voltage high before I replaced coolant sensor
here is what I got now 14 cts voltage low, 27 & 28 gear switch problem I suspect that is why my speedo sometimes works and sometimes intermittent along with a tranny signal like a skip or a gear change then speedo works, 31 park/neutral switch I don't have meters to check that out, 42 est circuit open or grounded needs diagnostics, 46 power steering pressure switch needs diagnostics.I like that mitchell1 manual it gave me alot of useful diagrams etc for my car. And I did find the pcv valve today laying on flat surface of intake only prob bracket above it also wiring harness over it and alt. In way.I still may get it out myself it should pull right out from the grommet.