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Old 01-20-2013, 08:07 PM   #11 (permalink)
NO TREAD ON ME
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You got a CD player??? Fancy .... Now that Im thinking about it, when I had my buddy flippin the hot to cold it was more like a vent flap moving inside the heater, but Im telling you half my air was coming out under the hood on the passenger side like where a airbox is, sorry Im not a mechanic, but 20 of my friends are, when I coulndnt figure out why I wasnt getting air from the heater my buddys like look at this, a strong push of air coming out towards the engine where what looked to be like a bunch of melted caulk.. Sealed it up, lots better. No Tread with 8 budweisers in him.
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Old 01-20-2013, 08:10 PM   #12 (permalink)
smackzed
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Yeah a vent flap, that's how I thought heat selection worked. The heater hose only being hot on 1 side makes me think the core is blocked

CD player, yup real fancy. I even have a couple CDs that I could put in it. Last truck I was just happy to have radio, Am AND FM.
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Old 01-20-2013, 08:20 PM   #13 (permalink)
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Do yourself a favor and have it recored. I did a thread somewhere around here but the Chinese aluminum crap ones they sell at Autoparts don't work nearly as good as the original Brass/copper one. The new ones are smaller, don;t fit right and don't transfer heat well.
Anyone know where to get Factory brass heater cores ?
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Old 01-20-2013, 08:28 PM   #14 (permalink)
NO TREAD ON ME
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Thats what I got am-fm, kinda like it, 2 am channels(fms all staticey), dont need all those decisions, however think Im gonna make my wife put on Bare Naked ladies- If I had a million dollars- in memeory of you all right now, aint they from Canada. Ill check my heater hoses tomm. to see if ones hot ones warm, but check that box thing. 10Buds No Tread
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Old 01-20-2013, 08:32 PM   #15 (permalink)
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vent flap could be stuck if vacuum actuater not working, but your right, sounds like a bad heater core
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Old 01-21-2013, 12:53 PM   #16 (permalink)
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do you run cardboard on the front? what condition is your fan clutch in? if the fan spins locked all the time you will not have heat.... even with the hummer fan spinning unlocked we see easy 50-75 degrees less than the old steel fan... you should try running a shot without the fan just to see if it heats up better....
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Old 01-21-2013, 01:14 PM   #17 (permalink)
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i would check the cable running to the heater coolant control valve, u have hot going in, u should have hot coming out, even with a partially plugged core. if the supply is hot and the return is cold sounds like the mixer control cable came off the valve or the valve is busted in the closed position.
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Old 01-21-2013, 01:30 PM   #18 (permalink)
smackzed
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trucks heating up OK now, it's just the heater that sucks.

Do I have to take the dash out to see the heater coolant control valve and the mixer control cable.

Oh I guess that's something I can look in the 73-87 Haynes manual
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Old 01-21-2013, 01:57 PM   #19 (permalink)
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cooling issue,

If one of your heater core hoses is cold and one is warm it means that the core is blocked, unless the truck has a heater flow valve ( usually only on a/c equipped) i just pinch off the two coolant hoses and get a blow gun and blow backwards through the heater core to blow any crap out, or if u have access to a garden hose just force water backwards through the core and try it then


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Old 01-21-2013, 02:56 PM   #20 (permalink)
smackzed
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Ok, no AC took a look under the dash while moving the heat selector an nothing was physically moving. One line did twitch when I moved it though and that line ran into the heater box itself. The amount of heat does change when I move the selector, from freezing at cold to just around not freezing at medium to tepid at hot
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AM/FM Radio -rebar except for engine trans and misc suspension parts

'90 GMC R3500 srw 3+3 280 000kms
CD player that eats CDs
No matter what Dieselplace may say, I am not a diesel technician, nor expert or specialist. Just a cheap guy with old truck that needs to run
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