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Old 09-26-2021, 08:05 AM   #1
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Dash Heater

Have a 2004 Fleetwood Revolution and am not getting any heated air out off the dash or defrost vents. Checked the heater hoses which were not even warm so thought I might have a blockage in the heater cores. Flushed both cores and found no evidence of blockage or scaling at all. When I disconnected the heater hoses, I had to plug the lines from the engine to keep the coolant from running out so I don't believe there is any blockage in those lines. After flushing, I started the engine and let it get up to temp which the gauge showed it to be about 175. Still no heat. I then checked the heater hoses and when squeezing them I could feel no pressure or flowing coolant. Now I am at a loss because I do not know how the coolant gets from the engine to the heater cores. Not sure if it comes right off the water pump or if it has some kind of flow valve or what. I could really use some help here.

Thank You

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Old 09-26-2021, 08:43 AM   #2
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Did you bleed the heater core?
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Old 09-26-2021, 08:47 AM   #3
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Welcome to iRV2.

On my Freightliner chassis , there are shut off valves beside the transmission on both heater hoses .
Freightliner routes the heater hoses to the front of the chassis , with the valves shut off so the cooling system can be filled at the rear of the coach . Coach builder hooks up the dash HVAC system , opens the valves and tops up the coolant .
Some owners turn the valves off for better A/C performance.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 09-26-2021, 02:42 PM   #4
"Formerly Diplomat Don"
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Somewhere in your system is a heater control valve, to keep hot water from running through the heater core when the A/C is on. It should be where you disconnected the hoses near the heater core. Typically, they rust either open or closed. It should look something like the photo below.

You can also take the two hoses you disconnected and connect them to each other to test and see if coolant is flowing forward and the hoses get warm.

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Don & Mary
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dash, heat, heater

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