Hot air all the time!

[Cody Forbes]

Mark Graham wrote:
> Howdy!
>
> I'm working 12 hr. shifts and haven't had time to check the archives.
> I have a 86 5000 with a seized A/C compressor now for 5 years.  Just
> recently, all it will do is blow hot heated air in the Vent, Economy
> position, etc.  No cool or cold outside air?  What do I need to check
> or fix?  Any guidance would be greatly appreciated!

I'm in the same boat. I believe the answer is one you aren't going to like 
though! The blower housing and such all rest in a very hot place, and 
basically your 'cool' outside air is just getting heated up by the super 
high underhood air temps that our cars suffer from. In my case the heater 
valve isn't leaking, and the heater core isn't getting too hot, and the 
entire HVAC casing under the cowel is very hot to the touch. Of course even 
without coolant flow the heater core will still heat up just by the heat 
conductivity of the water and hoses. 2+2 = No refigerant flow means windows 
down ;-).

It is also possible that your heater valve is leaking, or that it's being 
falsely opened. Try taking cobram's advice and clamping off one of the 
heater hoses. I suggest something like this design:
http://buy1.snapon.com/catalog/item.asp?P65=&tool=all&item_ID=66783&group_ID=1461&store=snapon-store&dir=catalog

-Cody Forbes
http://www.5000tq.com
'87 5ktq - Fast.
'86 5ktqCD
'86 5k
'86 5k