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Old 09-19-2017, 08:19 PM   #1
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defrost ?

I just bought a 2008 Fleetwood Southwind 35A, V10 gas, I tried to use the defrost driving home Sunday and it would just blow cold air. Am I missing something or should I see my mechanic. There is no smell of antifreeze and air blows hard just no heat.
I really like this coach and come from tripple towing for many years so have some idea of how systems work.
Thanks for all your help this site has been a great source of information over the years
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Old 09-19-2017, 09:52 PM   #2
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Do you have heat , when floor heat is selected ?
Engine temp gauge in the normal range ?

There is a water flow control that would need to be tested.

Some owners put an aux water shut off in the heater hoses to aide the dash A/C in hot weather ; worth a look.
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Old 09-20-2017, 06:57 AM   #3
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Some units turn on the air conditioner when placed in defrost mode. Turn the temperature knob all the way to hot.
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Old 09-20-2017, 01:12 PM   #4
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Thank you, no hot/warm on floor heat, knob turned all the way to hot, I will check for valve, where is the flow control located?
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Old 09-20-2017, 04:48 PM   #5
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Originally Posted by simply40 View Post
Thank you, no hot/warm on floor heat, knob turned all the way to hot, I will check for valve, where is the flow control located?
Heater flow control will be near the hose connection to the firewall side of the heater unit , above the radiator .
But , if a previous owner installed a shut off , that could be anywhere between the motor and the firewall; luckily on a gas front engine coach that's not far.
Here's a picture of the electronic flow control on my coach , some units are cable controlled .
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Old 09-22-2017, 10:23 AM   #6
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thank you Skip426 I will look for that valve
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Old 09-22-2017, 10:52 AM   #7
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You first need to determine who manufacture your HVAC. Early on Fleetwood used Denso HVAC with a blend air door and no water control valve. All electric, no vacuum. Not sure what Fleetwood used in 2008 but the may have switched to Evens Tempcon with a water control valve. Vacuum controlled.

Richard
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Old 09-22-2017, 06:58 PM   #8
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Thank you guys. I guess I have some work to do but at least now I know where to start
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