A well serviced P38 should last a long time and, in general, be reliable. The heater core O-rings are a known problem. Blend motors on the climate control are another known problem. (the motors that open / close flaps on the system to direct air to floor, defrost, vents, etc) See if all of the positions on the CC work correctly and switch fairly quickly. If so, then fine. Does your a/c work? If not, and its no big deal, than don't worry about it. If you like a/c, or need it, repairs are $$$. How about the BeCM? (the large computer under pass seat) Is it the original? If it is, do all of your electronics in the car work correctly? This is a very expensive repair, around $1,000. They are known to fail, but if kept dry sometimes they work a very long time. How about your engine? Pull off the PCV hoses. (they are small short hoses which come up out of the valve covers (front drv. side, back pass side.) The one on the driver's side is shortest and goes into the intake just before plenum. The one on pass side goes from valve cover into side of plenum. Look inside them for milky white fluid. Check the inside of you roil fill cap for water / or the milky gunk. If you have this, possibly a headgasket repair is in your future. This can be pricey. If everything looks good here, keep up the good maintenance (oil changes are considered most important) but do things like change trans fluid, brake fluid, diff & t-case fluids, and the truck might be worth keeping. Many people will also swear by the LUCAS / GEMS system in the P38'a which ran from 1994-98 before the BOSCH system.