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Old 11-28-2005, 14:01   #1 (permalink)
M White
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Thermostat on '94 F150

I get absolutely no hot air from my heat system. How do I test if it's a bad
core or a bad thermostat? The thermostat is an easy fix so I could do
process of elimination, but I just wanted to know if there was a way to
figure out what's wrong before I do anything. Thanks.

MW


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Old 11-28-2005, 14:01   #2 (permalink)
M White
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Re: Thermostat on '94 F150

I found this at about.com, but I'm hoping for something that wouldn't
require pulling something out yet.

"The best way to test a thermostat is to place it in a pot of boiling water
on the stove. As it heats up to its rated temperature, its valve should open
about an inch. If it doesn't, then throw it out and get a new one."

MW

"M White" <mike@avauntltd.com> wrote in message
news:3PKif.21079$7h7.435@newssvr21.news.prodigy.com...
> I get absolutely no hot air from my heat system. How do I test if it's a

bad
> core or a bad thermostat? The thermostat is an easy fix so I could do
> process of elimination, but I just wanted to know if there was a way to
> figure out what's wrong before I do anything. Thanks.
>
> MW
>
>



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Old 11-28-2005, 21:01   #3 (permalink)
David M
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Re: Thermostat on '94 F150

On Mon, 28 Nov 2005 21:40:15 +0000, M White rearranged some electrons to
form:

> I get absolutely no hot air from my heat system. How do I test if it's a bad
> core or a bad thermostat? The thermostat is an easy fix so I could do
> process of elimination, but I just wanted to know if there was a way to
> figure out what's wrong before I do anything. Thanks.
>
> MW


It might have nothing to do with the cooling system... maybe
the temperature door is not working. Warm up the engine and
put your hand on the heater hose. If it's hot, then the problem has
nothing to do with the core or the thermostat.

If the engine doesn't warm up, then maybe your thermostat is
stuck open.

--
David M (dmacchiarolo)
http://home.triad.rr.com/redsled
T/S 53
sled351 Linux 2.4.18-14 has been up 12 days 33 min

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Old 11-29-2005, 07:01   #4 (permalink)
putt@webtv.net
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Re: Thermostat on '94 F150

>The best way to test a thermostat is to
> place it in a pot of boiling water on the
> stove.


Yes that test will work, but if you intend to go through the trouble of
taking the t-stat out, why not just put in a new one? Cheap insurance!
If the heater hoses are hot, once the engine is warm, maybe the blend
door not functioning and/or the core is leaking/clogged. The hinges on
those doors have the nasty habit of breaking. Your truck is 10+ yrs
old. The lifespan of the core is right around 10yrs. Check the
operation of the blend-door actuator. If it is cable operated, unhook
the cable and manually turn the lever....the only sound you should hear
is a quiet 'thump' when the door closes off the heater core part of the
plenum. The better way to tell is to remove the heater-core cover in the
plenum and check the door for proper operation.....with that cover off
you can also tell if the core is a leaker too. A new core and t-stat is
under $50. Once they are replaced you are good for another 10yrs or so!

Hope this helps some.....

Dave S(Texas)

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Old 11-29-2005, 10:01   #5 (permalink)
M White
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Posts: n/a
Re: Thermostat on '94 F150

I can't tell you how much I appreciate everyone's feedback, including those
who have e-mailed me directly. I have pulled out the t-stat. I had the same
thoughts and am going to just put a new stainless steel one in. As it turns
out, the current t-stat looks like it was working just fine.

I am going to purchase a manual to find out what where all of these parts
are so I can inspect it the way you mention.

MW

<putt@webtv.net> wrote in message
news:9626-438C6540-928@storefull-3275.bay.webtv.net...
> >The best way to test a thermostat is to
> > place it in a pot of boiling water on the
> > stove.

>
> Yes that test will work, but if you intend to go through the trouble of
> taking the t-stat out, why not just put in a new one? Cheap insurance!
> If the heater hoses are hot, once the engine is warm, maybe the blend
> door not functioning and/or the core is leaking/clogged. The hinges on
> those doors have the nasty habit of breaking. Your truck is 10+ yrs
> old. The lifespan of the core is right around 10yrs. Check the
> operation of the blend-door actuator. If it is cable operated, unhook
> the cable and manually turn the lever....the only sound you should hear
> is a quiet 'thump' when the door closes off the heater core part of the
> plenum. The better way to tell is to remove the heater-core cover in the
> plenum and check the door for proper operation.....with that cover off
> you can also tell if the core is a leaker too. A new core and t-stat is
> under $50. Once they are replaced you are good for another 10yrs or so!
>
> Hope this helps some.....
>
> Dave S(Texas)
>



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