Weak heaters
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Weak heaters
My 2000 Expedition has these heater symptoms:
A/C works great, but heater does not put out max heat.
Fan works; but if Panel/Floor is selected then it does not blow out panel, but blows out elsewhere, like defrost. Rear heater is the same (low temp output). Could it be the computer in the selector head (temp probe?). If the front blend door was malfunctioning, would that effect the rear temp too?
Any suggestions?
A/C works great, but heater does not put out max heat.
Fan works; but if Panel/Floor is selected then it does not blow out panel, but blows out elsewhere, like defrost. Rear heater is the same (low temp output). Could it be the computer in the selector head (temp probe?). If the front blend door was malfunctioning, would that effect the rear temp too?
Any suggestions?
Junior User
Joined: Dec 2010
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I had this issue in our Merc Cougar..come to find out I drove it all summer w/ ac blowing out defrost for no reason..stuck my head up under the dash and found a vacuum hose disconnected from the vac pod. hooked it back up and all was blowing out the correct vent selections...
but we all know getting behind the dash of these beastly expeditions is next to impossible with out making a day or two of it.
expedition wise Im having heater issue's as well...dnt think its blend door as Ihear it move and the air temp changes...but won't get very warm at all..grrrr.
replied to put this topic next to the other heater issue in "Heellppppppp" thread.
but we all know getting behind the dash of these beastly expeditions is next to impossible with out making a day or two of it.
expedition wise Im having heater issue's as well...dnt think its blend door as Ihear it move and the air temp changes...but won't get very warm at all..grrrr.
replied to put this topic next to the other heater issue in "Heellppppppp" thread.
Fleet Owner
Joined: Apr 2008
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Your symptoms point towards a leaking vacuum hose. Check around the back half of the battery. The HVAC main vacuum hose runs there and corrosion from the battery tends to eat through the hose.
Junior User
Joined: Dec 2010
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lemme know if it helped..
Junior User
Joined: May 2007
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The tstat is low on my to-do-list, just finished doing the front end (bearings ball joints etc) and brakes all around. Should be later this week or weekend.
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Junior User
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Kewl..thanks. Gonna change mine out and flush the cores too...crossing fingers.
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Junior User
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So I think I have a combination of a problem. Changed the t-stat, and now the truck gets to proper operating temperatures.
The air now will blow warm - not really hot though, when the vehicle is under load. Sitting and idling it goes back to lukewarm to cool feeling.
So I'm thinking that's an air pocket in the system somewhere?
The air now will blow warm - not really hot though, when the vehicle is under load. Sitting and idling it goes back to lukewarm to cool feeling.
So I'm thinking that's an air pocket in the system somewhere?
Junior User
Joined: Dec 2010
Posts: 57
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I see. Ill change out the Tstat and go from there. I understand this system is not really under that much pressure..Ill probably flush out the cores under some moderate pressure and try to bleed out the air some how? Thanks for the update
Mountain Pass
Joined: Jun 2003
Posts: 147
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From: New Braunfels, TX
So I think I have a combination of a problem. Changed the t-stat, and now the truck gets to proper operating temperatures.
The air now will blow warm - not really hot though, when the vehicle is under load. Sitting and idling it goes back to lukewarm to cool feeling.
So I'm thinking that's an air pocket in the system somewhere?
The air now will blow warm - not really hot though, when the vehicle is under load. Sitting and idling it goes back to lukewarm to cool feeling.
So I'm thinking that's an air pocket in the system somewhere?
I can't remember the exact post, but I do remember that his FLM service center decided to "burp" the truck by jacking up the front wheels. I'm thinking a search for "burp" would turn up this post and that one and no more!
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