No Heat
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Senior User
Joined: Sep 2003
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No Heat
I have a newly rebuilt carbed 300 CID in my F150. I have the electric fan on a manual switch and recently changed the Tstat to 190 degrees.
The hoses going into my heater core are hot to the touch but I get very little heat out of the vents.
Does it sound as though the core is bad and what do cores run?
Thanks
The hoses going into my heater core are hot to the touch but I get very little heat out of the vents.
Does it sound as though the core is bad and what do cores run?
Thanks
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Joined: Nov 2004
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From: N. Gwinnett Co. Georgia
Check Autozone website for pricing in your area, not a plug, just a reference. The core for my truck is listed @ $17.99 as of 3 minutes ago. Based on the Weather Channel it's a little cold in your area right now, have you flushed your system? If you do you can carefully remove hoses from firewall and take a water hose and route water through one side and see the flow returning, would be a bit of a cold job right now. If it's plugged up you have your culprit. Otherwise, I'd look at the blend door, you didn't say year model, and make sure your heated air path is open when selected.
Tex
Tex
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Originally Posted by tex94F250
Check Autozone website for pricing in your area, not a plug, just a reference. The core for my truck is listed @ $17.99 as of 3 minutes ago. Based on the Weather Channel it's a little cold in your area right now, have you flushed your system? If you do you can carefully remove hoses from firewall and take a water hose and route water through one side and see the flow returning, would be a bit of a cold job right now. If it's plugged up you have your culprit. Otherwise, I'd look at the blend door, you didn't say year model, and make sure your heated air path is open when selected.
Tex
Tex
-11 is a might bit chilly.
I did not flush it after the rebuild. It was warm then.
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Joined: Dec 2003
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Well, if your plenum door is cable-actuated, you could be getting no heat, because the cable is broken or crappy. Mine's really old, and it shifted around in the little bracket that holds it, so it wasnt where it was supposed to be and only gave me a little heat. It was also too crappy to open the door that far in the first place. If that sounds like the problem, just pop off your glovebox and move the cable to where it should be, or better yet, get a new, smooth-operating one. However, if your truck is one of the 92-96 models, the plenum door I'm pretty shure is vacuum-actuated, so you'll have to look for a leak or loose line or something.
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Originally Posted by tex94F250
Does your heater fan work well? Are you getting air, but not hot enough air? Seems like you're getting flow through the heater core.
Tex
Tex
I'm getting decent air, the fan is blowing well enough but it did makes some interesting noises yesterday during the worst of our cold snap.
The truck is an '89. It's pretty beat so a new core and fan might not be a bad idea anyway.
We're supposed to be in the 60s next week so I might need to charge my AC while I'm at it.
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Posting Guru
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From: N. Gwinnett Co. Georgia
Roger that. Neither is extermely expensive and you actually learn a good deal when doing replacements of this type. Fan's pretty easy, heater core a little more challenging. Again check your blend/plenum door. In an air system a restriction may actually cause a perceived pressure increase, much like when you pinch the end of a water hose, velocity increase, volume loss. If it's warm enough, after checking trhe door, I'd flush it anyway. Don't want to get crap in the new core.
Tex
Tex