What have we done? New radiator and new thermostats and a new heater control. Our mechanic cannot seem to figure out what is causing it. But when the truck is sitting at an idle, the heat seems to be fine, with the winter front on, but going down the road, the heat just isn't sufficient. Hubby thinks that there is a valve somewhere sticking, question is where.
Another thing that makes us think that something is wrong, is when he has it set to vent, and then shuts the fan off, air blows through the vents like its turned on high.
Any ideas??? 2001 Freightliner FLD 120
N14 still issues with heat in cab after $$$
Discussion in 'Trucks [ Eighteen Wheelers ]' started by bullhaulerswife, Jan 4, 2010.
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1. At idle there is less heat loss and heat gained from exhaust under the floor. Try opening all valves in the system to max heat and run for 30 minutes or so with the radiator cap off. this is to remove an air left in the system after all the changes. Bump idle up to 1K.
The next Q is how is the actual coolant temp at speed? Again more heat loss at speed. If temp is too low likely a thermostat stuck open.
Hope this helps. The fan speed thing sounds like bad wire or switch, does the variable work on vent?bullhaulerswife Thanks this. -
Are all 4 valves open...He has a sleeper cab too?
What's the running temp going down the road?
Also...is there a manual fan switch?
I have to agree with Pawnd about the switch....bullhaulerswife Thanks this. -
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Hmmm...is that an OEM thermostat?
Some of those Chinese aftermarket parts fail right out the box..... -
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Great, no part number on the invoice, so I have no idea if it is OEM. Hmmmmmm
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Now you got me thinking.......
On my KW there's a resistor (?) on the plenum.....
It looks like a loose copper coil....that would go south and the heater wouldn't work.... -
You mean as in not produce heat? Or dead in the water, not work. LOL Makes no sense why the water temp is so cool with the winterfront on and completely closing in the grill, either.
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With low engine temps and the air control on vent, the heat will never be warm on very cold days.
Change thermostats and run the inside air on recirculate to keep the cold air out.bullhaulerswife Thanks this.
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