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Old 01-18-2019, 09:37 AM   #1
Join Date: Dec 2018
Posts: 14
Help! Safely removing heater

Hello all,

So Ive watched 10+ videos of others removing their heaters. My bus is a mini bird and I need some advice before moving ahead. 1999 GMC stv 6.5 detriot diesel.

Electrical: how do I safely disconnect the wires from the heater. Even with the engine off these are still connected to the battery correct?

Heater removal: I plan to:
Drain coolant from pipes from underneath the bus
Connect the lines with a copper u joint to close the loop
Secure connections with pipe clamps

Please let me know if you would do things differently. I haven't even gotten to drive my bus yet, paranoid if frying something crucial.

Thanks everyone!
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Wantabus is offline   Reply With Quote
Old 01-18-2019, 06:27 PM   #2
Join Date: Jan 2019
Location: New Mexico
Posts: 27
Year: 1984
Coachwork: TMC
Chassis: MC-9
Engine: Detroit 6v92 TA
Rated Cap: More than I need
The wires should only be live when the switch is on for the heater. You will need to find the fuse and pull it and disconnect the wires leading from the switch to the blower. I would pull the wires all the way out if they are easy to get to otherwise just clearly mark on both sides what they wear for and that they have been taken out of service. You will thank yourself later. As far as the coolant lines if you can take them apart in the engine compartment. The more of the old system you remove the less it can bother you in the future
Stngllhm is offline   Reply With Quote
Old 01-18-2019, 07:00 PM   #3
Bus Geek
o1marc's Avatar
Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 10,482
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
That switch can be repurposed and possibly use the old wiring in place
o1marc is offline   Reply With Quote

electrical, heater, heaterhowto, safety

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