Reply
 
Thread Tools Display Modes
 
Old 11-16-2014, 06:08 PM   #1
New Member
 
Join Date: Jun 2014
Posts: 7
Year: 1998
Coachwork: Thomas
Chassis: 3800
Engine: Diesel, international
Defrost help!!!!

I have a thoms 3800 with a T444e Diesel. I removed the rear heater and looped the two lines together this summer while finishing the inside. We finished the floor and are ready to take it hunting and I can't get the heater/ defrost to work. I have turned the valve on inside and opened the valves on the engine. Blowers work but no heat. What have I done.
Bureau602 is offline   Reply With Quote
Old 11-16-2014, 09:15 PM   #2
Bus Crazy
 
Join Date: Nov 2011
Location: Sault Ste. Marie, Ontario
Posts: 1,439
Year: 1997
Coachwork: Thomas
Chassis: B3800 Short bus
Engine: T444E
Rated Cap: 36
Re: Defrost help!!!!

Do the coolant hoses get warm to the touch? If all the valves are open and the hot coolant is flowing, then I'm suspicious that the problem lies in the "loop" you created when removing the rear heater. With the way my Thomas' coolant system is plumbed it made the most sense to actually terminate the rear heater lines, instead of looping them. The front and rear heaters were tee-ed off, not inline. Plugging the rear heater lines forces all coolant to go through the main heater core.
__________________
My build page: Armageddon - The Smell of Airborne Rust
jazty is offline   Reply With Quote
Old 11-16-2014, 09:56 PM   #3
New Member
 
Join Date: Jun 2014
Posts: 7
Year: 1998
Coachwork: Thomas
Chassis: 3800
Engine: Diesel, international
Re: Defrost help!!!!

The lines do get warm. Does the defrost come the heater by the door or the heater by the driver. The loop I made is the supply and return from the rear heater connected about 12 inches from the heater by the drivers seat. Several people on here had succes with it.
Bureau602 is offline   Reply With Quote
Old 11-17-2014, 08:49 AM   #4
Bus Crazy
 
Join Date: Nov 2011
Location: Sault Ste. Marie, Ontario
Posts: 1,439
Year: 1997
Coachwork: Thomas
Chassis: B3800 Short bus
Engine: T444E
Rated Cap: 36
Re: Defrost help!!!!

In my bus the defrost came from the heater next to the driver. Actually, I think the one by the door was also connected to the defrost vents. It's a smaller heater, though, so would likely just be helping out. The big one is the driver side heater. It's easy to open for inspection, too. There are a couple screws on the faceplate. Once you remove them you can pull the whole panel off and see all the heater components. That's the one that would be affected by looping the lines (Iess coolant being pushed through that core, since the path of least resistance is to follow the open, looped path).
__________________
My build page: Armageddon - The Smell of Airborne Rust
jazty is offline   Reply With Quote
Old 11-26-2014, 08:28 AM   #5
Site Team
 
bansil's Avatar
 
Join Date: Nov 2011
Location: MNT CITY TN
Posts: 5,044
Re: Defrost help!!!!

big air bubble in the heater core?

if both lines get hot that wouldnt be the case, does the actual heater core get hot to the touch?

if it does and the fans work, is there a manual vent open close? maybe it's blowing hot air but it cant get to the windshield
__________________
Our build La Tortuga
Accept the challenges so that you can feel the exhilaration of victory.
George S. Patton
bansil is offline   Reply With Quote
Old 11-26-2014, 08:57 AM   #6
Bus Nut
 
Join Date: Sep 2014
Posts: 546
Re: Defrost help!!!!

Q...did it work before?
__________________
Don and Mary
dond is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Virginia Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 03:40 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.