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Old 07-23-2021, 07:23 PM   #1
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Heater Core Replacement?

I have a 2008 Fleetwood Discovery, freightliner chassis, Cummins 6.7L, 350HP. Entire rig is in exceptional shape but have just noticed the passenger side floor between the front captain seat and the dash is obviously swelling. Some sort of water issue. It’s apparent. I think I may smell a little antifreeze smell when I run the heat (which I seldom do). However, I do have to add about a quart of water every 1000 miles or so (minimal). I suspect a heater core leak. Questions are:
1. How to access the heater core.
2. Best way to disassemble the dash to replace the flooring? It would seem to be a huge deal on the flooring part. Thanks.
3. Would Fleetwood be of any assistance with procedure for removing dash or heater core?
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Old 07-24-2021, 06:12 PM   #2
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Before you go to a lot of work, check the heater hose clamps. If loose they will allow antifreeze to squirt through the 2 firewall openings. KISS (Keep It Simple S GRIN) Made that very mistake on my ol Bounder.

Richard
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Old 07-25-2021, 08:54 AM   #3
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Thank you sir. The hose visible on the outside are not leaking. Is the core easy to remove to view it?
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Old 07-26-2021, 11:01 AM   #4
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Quote:
Originally Posted by Marty G. View Post
Thank you sir. The hose visible on the outside are not leaking. Is the core easy to remove to view it?
No the core is not easy to remove. HVAC from Denso. https://www.densoheavyduty.com/hvac-systems You will need to remove the panel in front of the passenger. Which I think requires removing the right side of the dash.
The AC will need to be drained and the evaporator removed to get to the heater core.


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Old 07-31-2021, 01:18 PM   #5
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Thank you for the insight. When you say, “drained”, do you mean “depressurization” as in I’ll have to recharge the system?
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Old 07-31-2021, 01:21 PM   #6
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You could go to home depot and buy a lever valve and simply block off the heater core for now, until you decide about the floor.
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Old 08-01-2021, 11:20 AM   #7
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Thank you for the insight. When you say, “drained”, do you mean “depressurization” as in I’ll have to recharge the system?
Exactly.

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Old 08-01-2021, 02:39 PM   #8
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Look back around the sides of the engine, locate the hoses there, some coaches have shut off valves by the engine.
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