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Discussion Starter #1
Hey guys and gals...

I posted on this before, looked for the post but didn't see it; I'll look again tomorrow.

In the mean time...long story short, my mom and dad's 92 150's heat is out. Now that I am home for the break I have been able to do some work to it. Here is what it is doing, and what I have done...

Blowing cold/cool air regardless of temperature settings...all controls work except for the "heat." Also, the temperature guage is not regestering at all; regardless of time truck is run.

I have replaced the thermostat, all hoses, and the heater core; as well as have checked all fuses - same thing still happening.

There is a "burnt" wire under the water pump - it hangs down next to it. It is a two-wire system with a female connection head - Dad and I are not sure where this goes -- or if that is even the culpret. Personally, I think that may have something to do with the temperature guage not regestering; but not the heat not working.

I need to get this fixed before I go back to Virginia; have no heat in the truck and the power steering pump in their Bronco is out (look for a thread on that, too...). They have been driving my Bronco (which is of course fine by me) but I will need it to go back to VA in a few weeks.

Let me know if you guys have any ideas on this (and like I said, take a look at my power steering pump thread, too...)

Thanks in advanced, fellas!!
:beer
Bill

EDIT: Just want to add that the truck does not/is not overheating nor has it since this started.
 

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Run the engine at idle, warm it up. Check both heater hoses. Both hot means flow through heater core is good, check vaccuum operated duct flaps under dash. If the feed hose is hot and the return hoes is cold, then heater control vavle not working.


Bob K.
 

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Discussion Starter #3
Um...where are those hoses? I am assuming I will know them when I see them.

Yeah, I checked the core hoses, like I said...this is a brand new core.

:shrug
Bill
 

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Um...where are those hoses? I am assuming I will know them when I see them.

Yeah, I checked the core hoses, like I said...this is a brand new core.

:shrug
Bill

They are the hoses that run coolant through your new core. Do both get hot?
 

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Discussion Starter #6
Yeah, both hoses INSIDE the engine compartment get hot...

I'll look inside the cab today; for any hoses...

:brownbag I've never worked on a heater before
 

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Discussion Starter #7
WELL! I got it fixed. After checking and rechecking everything we have discussed here and in chat, still nothing. SO, I decided to take out the control panel and give it a look over. I got it out, and everything looked good - until I turned the temperature knob with the unit out...that's when I noticed that the knob was turning, but the thing in the back wasn't. Sooo, I took off the knob and it looked fine, so I kept trying it - turns out that the knob was cracked and allowing the metal peice to just spin in there once it got too much torque on it - it was working slightly, but not enough to get all the way over to hot. I simply swaped the knobs from fan and temp and now everything works fine. Heater doesn't seem to blow as hot as the other trucks, but it's a HELLUVA lot better than it was.

Ooh, I even replaced the vacuum pump on the heater box.

Now, the temp guage still doesn't work...and suggestions for that? I have replaced the thermostat twice and nothing. Checked the fuses and so on. The truck doesn't overheat, I just don't get any sort of temp reading.

:beer
Bill
 

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Discussion Starter #9
I didn't replace that...never heard of it...where is it? I'll look in my Hanes (not underwear) tonight.

:thumbup
Bill
 
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