how to remove dash on 98 isuzu tropper

Here is a guide that will help with replacing a heater core. Please review this and the attached material below from the manual:

https://www.2carpros.com/articles/replace-heater-core

You will find the attached process on how to remove the dash and the heater core unit. Then I attached the process on how to remove the heater core from the unit.

Please run through all this material and let us know if you have other questions. Thanks