Heating Problems 88 5KSQ

[Kneale Brownson]

Those valves should be open by default and only close when the programmer
applies vacuum because the A/C is on.  I'd expect you have a heater core
box flaps issue.  When the engine is fully warmed up, are the radiator
hoses hot?  Are the heater core hoses hot?

At 12:08 PM 12/14/2003 -0600, B1biker wrote:
>With the onset of cold weather here in Nebraska I'm having trouble getting 
>the heater to work properly. I have changed the thermostat and checked the 
>operation of the programmer, it seems to be working properly. The 
>reicrculating flap is broken and in the 'fresh air' position but its been 
>that way for several years and I have not had this problem in the past. My 
>primary questions relates to the temperature control valve(s). The Bentley 
>seems to indicate that there is only one temperature control valve in the 
>system; this being the vacuum control valve located in the engine
compartment. 
>1 -- Is this valve open (full flow) position when vacuum is applied? (lever 
>moves up and down freely in response to vacuum)
>2 -- What is the likelihood that the valve is broken internally and is 
>always partially closed even though it 'appears' to be working? 
>3 -- Is there another valve that controls water flow to the heater core? If 
>so where do I find it?
>
>Any help will be greatly appreciated.
>Gary L. Meier
>82 CGT, 84 4KS, 88 5KSQ
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