Open both front doors and remove everything from the front seat to the firewall, no kidding.
To change the heater core in a 1988 Isuzu pickup, start by disconnecting the negative battery cable and draining the coolant from the radiator. Remove the dashboard or any components obstructing access to the heater core, typically located in the firewall. Disconnect the heater hoses from the core, unbolt it from its housing, and replace it with the new unit. Finally, reassemble everything, refill the coolant, and check for leaks.
first you will have to remove your heater hoses going to your motor to the firewall take them off at the firewall, then there is a big box on your firewall, there is a bunch of screws holding it on remove them you heater core will be inside it.
Remove the three 8mm screws holding it in
You'll need to pull much of the air shroud under the dashboard. Once you expose the heater core you'll need to disconnect it from under the hood. There are a few studs near the heater hose connections that hold the core in place. Pull them only after you've removed enough of the air shroud to get the core out.
same procedure as yesterday
what is the year model? 1995
A sweet smell indicates engine coolant. It you can't see any leaking from the hoses in the engine compartment, it's probably the heater core. With the smell coming from the vents too, it's most likely the heater core, but rule out easy fixes first.
under glove compartment take time removing
Remove your heater hoses from the core (cut them if necessary) and join the two ends with a heater hose coupling. Use screw ring clamps to secure the lines to the coupling. You can pick up all these parts at any major autoparts store.
Its your Heater core if it smells like a syrupy sweet smell if not then its your thermostat
Yes, in box behind dash, a very involved job, i did one in a 2003
Actually there is no real easy way, you must pick apart the complete dash to R/R correctly...if you shortcut you might just spring a leak!