85 chevy 350 single cab heater/ defrost ?

[ironroad9c1]

when I got mine it had a big rats nest at the heater core, it blew air like a hurricane on clod, but turn it to hot and you barely got any air. once I cleaned it out, it will run you out.

[Willie496]

Mine will heat you out also!! Just no defrost.. Man I need it clear the ice around here.

[motornut]

Originally Posted by Willie496

Mine will heat you out also!! Just no defrost.. Man I need it clear the ice around here.

taking the glove box off sure helps for access to that blend door area
if you have to take out the box tho...
when opened up some def/floor actuators(gas pedal one) have 3 settings
it can be set to leave (1/3) flowing up or down,
or all up and all down

[true74enduro]

Thanks motornut been way busy with work I'm gonna try and check my heater today after work

[motornut]

I posted some pics of the 81 system here
http://67-72chevytrucks.com/vboard/s...d.php?t=601850

[rs74]

Do like Motornut said and pull the glovebox and if you need to then pull the duct that is for the vents so you can see what is going on when moving the levers on the control panel. I just went through this with mine. Half of the duct work was missing along with a white plastic clip that was broke keeping the blend door from opening and shutting. Get in there and take a look is the best thing you can do. This will let you "see" what is going on and will also allow you to learn and see how it all works.

[true74enduro]

Awesome guys I'm gonna get up early tomorrow and look and see what I can do to fix my heater

[true74enduro]

Thanks guy for the help still been busy at work but I'm gonna take off my glove box door after in get back home from Black Friday I work at homedepot and all associates have to work ugh.

[COOP3726]

Always do the simplest things first. If you will drain your radiator, then take both heater hoses off the heater core and hook up a water hose and check the flow from the core. Rule this out first. It may be the issue. After you rule this out, then you can start checking other things. There may be issues with your dash controller. I have seen where the controller was not getting the vacuum that it needs. Check the vacuum to rule it out. Hope this helps.

[true74enduro]

So of course I didn't get a chance till today while it's snowing. But anyhow I got the glove box door off. I can tell the first linkage piece wasn't moving all the way open to close with out my hand moving it. Is there away to adjust it. If you y'all could help me from here as to what I can do next.

[COOP3726]

Try using WD-40 in the cable first before removing. Then if this does not work, you may want to take it off and replace it with a new cable. Also there may be a rats nest stopping it from closing all the way. Only if the truck has been setting for a while. (Just a thought). Most of these trucks the cables will rust a little and keep them from working properly. Hope this will help.

[true74enduro]

I dunno if I did it right or not but she's working like a charm after I did my last message I went out again noticed the rod that connects to the door could pop off so I did just that and ajusted the lever accordingly

[COOP3726]

Glad that done it. Happy holidays to u.

[true74enduro]

Thanks you guys for the help

[true74enduro]

Well so is my luck fixed the heater but today my truck boiled over. My truck has never heated up a day in its life till today. I'm thinking maybe my radiator froze up

[motornut]

crap,better not leave that....I've seen high water mixes crack blocks'ahead of the mount
better get a squeeze bulb anti freeze tester

[true74enduro]

Would y'all suggest changing out the heater core seance my trucks radiator froze over? I fixed my coolant mixture. I'm just not getting heat at all now so I think my cores plugged

[COOP3726]

If the radiator was frozen, then the core may be frozen up also. Try flushing the core out before changing it. The heater core is not easy to change.

[463]

Originally Posted by true74enduro

Well so is my luck fixed the heater but today my truck boiled over. My truck has never heated up a day in its life till today. I'm thinking maybe my radiator froze up

What was or is the freeze point of your coolant?
If it is higher than the outside temp it will gel and may freeze solid.
As mentioned get a bulb anti freeze tester and see where your freeze point is.

[463]

The truck will have to go into a heated shop to thaw out and then do a pressure test on the cooling system to see if there is a problem.

[true74enduro]

So I have to change my heater core. Well when I went to do it I snapped my cooler cover which they don't make anymore. All because I didn't see the bottom screw. Is there any easy way to get to the bottom screw? And or seance I have to go to a junk yard and hope they have one there can some one tell me which screws all have to come off cause it looked like when I was doing it Right and it seemed I had to take the cover off. Dang this sucks and it's only -1 out side

[motornut]

should be close to the 81

[true74enduro]

Thanks again. I just didn't see that bottom nut it's in an odd spot you can't see it seance it's behind the wheel well arch. They should've just installed the nuts on the reverse side in the cab so you could see them all or something thanks again