Has been starting hard, almost like fuel starvation. when safari starts it runs fine, full power, no hesitation. If safari has not been sitting for more than two or three hours it starts ok. 97 Safari sat in driveway one day(24 hrs or more) now cranks ok but no start, tried so many times (2 or 3 seconds at a time) battery is getting weak. I have battery on a charger right now.

SOURCE: 97 GMC Safari - best type thermostat, location, temp?

The owners manual will tell you the temp you should use, but you can also look at the old one when you pull it out as it will have the value stamped on it. As for the brand, most are all okay. I use stant brand since that's what the local parts store carries. To find the thermostat under the hood, follow the top radiator hose to the engine block and a domed housing. It's under the housing.

SOURCE: 96 safari hard cold start

you have to remove the tank from vehicle and if you do this replace all parts sending unit pump sock and pulsator

SOURCE: hard cold start 96 safari

Check fuel presure.I believe its 61 to 65 psi, with little or no drop off in ten minutes.V-6 access port for fuel presure is at left rear of engine,(remove dog house to access). Fuel pump is in fuel tank.Use AC Delco only, there is a updated wire harness conector for these.

SOURCE: Hard start 1997 Gmc 4.3 Safari

take a fuel pressure tester pressurise fuel system dont crank .look at gauge at fuel pressure if it drops from 41 psi to 30 psi in .10 mins. you have a leaking fuel injector or injectors.flooding out engine

SOURCE: vent selector stuck on defrost (knob turns - no

There's a good possibilty that you have a vacuum line off. When the heater controls lose vacuum, the heater will go into the defrost mode. There should be a small line, about 1/8 inch in diameter, that goes from the engine to the firewall. It's most likely on the passenger side.