1. Bad pressure switch. 2. Bad pressure switch pigtail. 3. The system is low on freon.
Yes
No they will not.
depending on model of truck.
Diagram of 1990 chevy truck steering column
yes, they should be identical.
Yes it will.
Which engine?
That would be the 700R4
Yes they will.
NO. It has a cable.
In the truck!
YES. Those 2 engines are the same. NO difference. It is a direct bolt in.