I would start by checking the thermostat, it may not be opening.
The sister vehicle of the Isuzu Trooper is the Acura SLX
1999 Isuzu trooper
A 1999 to 2001 Acura SUV and a 1999 Isuzu Trooper are different vehicles with distinct dimensions and designs, meaning they are not directly interchangeable. The Acura SUVs from that era, such as the Acura MDX or RDX, have different body styles and specifications compared to the Isuzu Trooper. Therefore, parts or components from an Acura SUV are unlikely to fit a 1999 Isuzu Trooper without significant modifications.
In the fuel tank
blown fuse?
how to set the timing on 3.5 liter engine on a trooper 98
ATF-III
Its under the intake
Automatic is a gm 4l-30e unit.
No, this is not an interference engine.
A 1994 Isuzu Trooper and a 1999 Isuzu Trooper share a similar platform, but there may be differences in dimensions, engine specifications, and mounting points due to changes in design and engineering. Generally, parts like engines or transmission components may fit, but it's essential to verify compatibility for specific components. Always consult a professional mechanic or refer to official service manuals for accurate information before attempting any swaps.
Radio antennae are located in the rear side windows.