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Old 01-25-2022, 01:13 PM   #1
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National Tradewinds 2002 - front heater core location?

The MH is a 2002 National Tradewinds. It has a small coolant leak from the front. I notice it after a run, there is a small puddle in the front. I am looking for advice on how to inspect the heater core and hoses.

Is the core visible? Are the hoses visable? Is the best way to look underside and up or top side and down?

I do not want to start taking it apart until I know i am starting at the right place and going in the right direction.

Thanks in advance, Dan
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Old 01-25-2022, 07:20 PM   #2
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Is the puddle anti-freeze ??

The HVAC will , drip condensate ( water) from operation in A/C or defrost .
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Old 01-25-2022, 08:22 PM   #3
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Ah. Coolant.
We are in Oregon and it is 40 degrees. :( Only the heater is operaitonal, no AC yet.

Dan
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Old 01-26-2022, 07:55 AM   #4
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I was thinking about this. The AC unit was worked on by the PO. Even at 45 degrees if the AC were running it cause the symptom.

Can someone provide the location of the fuse and the wireing dagram showing the location?
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Old 01-26-2022, 10:10 AM   #5
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What chassis is your coach on ?
Freightliner chassis have shut off valves in the heater hoses beside the transmission .

Can you see the HVAC housing , to see what brand of dash unit National installed ?
Evans ?
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Old 01-26-2022, 03:41 PM   #6
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Thank you for the photo. The chassis is Spartan with a Cat 3126e. I will go climb around the dash and look underneath.

The dash is molded, I do not know if it lifts off or not. I will look for the HVAC; it should be easy to determine if the AC unit is on by the temps in the AC lines.

Dan
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Old 01-26-2022, 06:28 PM   #7
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The picture I've posted is the outside of the firewall , above the generator , on my Newmar.

When I had a coolant leak out front , it was coming from the electronic water control ( Ranco ) valve , green circle on left at the top.
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Old 01-26-2022, 08:27 PM   #8
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Attached is a photo looking up.
There are visable drops of red fluid from what I beleive is the heater control valve.

As a second question what is the black cylinder on the right?

Thanks, Dan
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Old 01-27-2022, 08:50 AM   #9
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Quote:
Originally Posted by dansawyer View Post
Attached is a photo looking up.
There are visable drops of red fluid from what I beleive is the heater control valve.

As a second question what is the black cylinder on the right?

Thanks, Dan
The leak appears to be from the water flow valve .
The black cylinder , if I'm seeing the connections to it correctly , is the A/C system receiver/dryer.

Boy am I glad that Newmar gave my coach a " hood " to open up the front cap for access to HVAC and wiring .
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Old 01-27-2022, 09:01 AM   #10
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In this copy of your picture ; the green arrows are the A/C lines and the yellow arrow one of the A/C refrigerant service fittings .
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Old 01-27-2022, 02:31 PM   #11
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I have created a specific thread in the general Class A forum asking the general quesition regarding identification and sources.
'Heater control valve'

Thank you all for helping get to the point. Dan
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Old 01-30-2022, 12:19 PM   #12
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I went back yesterday and checked. The coolant drop was higher then the outlet of the heater control valve. I believe the leak is higher up. I have a radiator tester. I hope it fits. I will charge the system to 7 psi and then look for sources.
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