Heater Problem....
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New User
Joined: Jul 2003
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Heater Problem....
My 2000 F-250 7.3 Diesel Super Duty truck heater will put out heat even when I have the vent switch to outside air and it's cool outside.
Anyone know what might be happening? I was once told there is some sort of device that cuts off the heater on hard pulls or hauls, but can't find any info on it now.
Thanks in advance for your help.
Anyone know what might be happening? I was once told there is some sort of device that cuts off the heater on hard pulls or hauls, but can't find any info on it now.
Thanks in advance for your help.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
There is no provision on a Superduty to cut the coolant flow from the heater core, so the coolest your vent will ever be is about the same temp as the radiator. I don't believe you are having a malfunction.
You can cool off the vent, and the a/c by installing a shutoff valve in the heater core line.
You can cool off the vent, and the a/c by installing a shutoff valve in the heater core line.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,111
From: Rio Rico, AZ.
I have the same problem even with the heater core shut off valve installed and closed. It's especially warm after sitting in the hot sun for an hour after a long drive. I've tried running the vent for up to 5 minutes with no sign of it cooling off. I have the coolant flow stopped via a manual valve under the hood. I have no idea why it blows so warm for so long other than the housing is just warm from engine heat. I just end up turning on the AC or turning the controls to off and opening the windows.
Fleet Mechanic
Joined: Aug 2003
Posts: 1,769
Likes: 95
From: Phoenix, AZ
Here's the fix when it is on Max A/C.
http://www.dieselsitetoo.com/index.a...ProdID=21&HS=1
I know of another link where a PSD owner used a Ford Ranger valve and controlled the opening and closing with a switch in the cab.
http://www.dieselsitetoo.com/index.a...ProdID=21&HS=1
I know of another link where a PSD owner used a Ford Ranger valve and controlled the opening and closing with a switch in the cab.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,111
From: Rio Rico, AZ.
I have something similar to that already installed and mine will still blow heat for a long time. As in for up to 5 minutes before I give up and turn on the AC or just shut it off and open the windows.
Posting Guru
Joined: Oct 2003
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From: Baltimore
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I should have mentioned that I can turn on the A/C and it will cool down, but if I go back to vent, after it cools down the ducts, it will still go to some heat, rather than the cool air outside.
If it's 50 degrees outside and I get heat from the vents, I can go to A/C and cool off the vents, switch back to vent and get the warm/hot air again. This is an intermittant problem.
Thanks for your response.
If it's 50 degrees outside and I get heat from the vents, I can go to A/C and cool off the vents, switch back to vent and get the warm/hot air again. This is an intermittant problem.
Thanks for your response.
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Elder User
Joined: Jul 2002
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From: Kingsland, GA
Don't forget that the air inlet and some ducting for the ventilation system are right next to exhaust components (namely, the passenger exhaust header and turbo). May not be much you can do except use the A/C a little more. Heck, you're already paying the gas tab for the rig, what's a little more!?!?
