No Heat, freezing :/

[joeshark]

So it's starting to get pretty cold here in nyc :/

My heat seems to work one day & another day i've got no heat. I hope there is a cheap easy fix, pretty low on funds at the moment.
Everything from switching zones, to closing fresh air vent, seems to be working ok; only i'm getting cold air.

Any ideas?

Thanks

 

[SunlitComet]

vacuum hose from water valve to solenoid on wall in place and in good condition?

 

[joeshark]

Oh God already I'm lost . Haven't a clue what any of that is sunlit.

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[SunlitComet]

hoses from right side of engine on the firewall. there are two that extend about a foot forward when it enters a water valve.
http://www.gmpartseast.com/chevy/co...es-pipes-heater-tc080310108-l31m30k10706.html

 

[joeshark]

Thanks sunlit; really appreciate the help. Do you mean the hoses that go to the heater core? That side of engine, or other side?

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[SunlitComet]

16 and 18.

 

[joeshark]

So I checked & the hoses look good & intact.

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[SunlitComet]

not just the water ones but the vacuum lines 14 and 20 as well. disconnect 20 from 21 and attach a hand vacuum pump to the line. turn temp dial full left and apply 15 inches of vacuum. turn temp dial to any where else. how much does the vacuum gauge drop or rise? need to do the with key on btw.

 

[joeshark]

Thanks sunlit, but have no means of doing that. I've checked those lines, everything looks in order, Could it be that ACTUATOR HTR WAT SHUTOFF VLV,(SOLENOID? Or that would just be guessing?

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[SunlitComet]

do hoses 16 and 18 get as hot as the the rest of hoses at least? look at the part below and notice the crank on it. when you turn the temp setting from max cold to any other setting that crank should move. do you see that happening?

 

[joeshark]

Took the truck to my mechanic. He believes the heater core is the problem; could this be it? It's a very strange thing, hear works in the days which temps are above 40 or so. When it's colder, no heat. I do recall that when I was messing around with plastic cover under heater core, there was some antifreeze, not much, but still.

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[ccapehartusarmyINF.(ret)]

just go get a space heater and one of those power converters at walmart strap that bad boy in yer cargro area and crank it up lol

 

[SunlitComet]

if the it is blocked it could be the issue. regardless if you saw coolant in the hvac box and are absolutely sure it is not leaking in from a hose outside then it must be replaced.

 

[GMan]

Just had the same issues with my 95 5.7 tahoe. Back in the summer I installed a new stereo and the stereo sits on top of the AC controls. Months go by it gets cold here and I turn on the heat. No heat. I flushed my core checked blend door actuator no movement. Before I changed I decided to check controls first and the circuit b that connects to the control knobs had came out from that new install..simple fix that took me days to figure out. But I did notice that all of the dash was kinda loose and the dash board has the common 95 chevy shake.

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[joeshark]

Well turns out the problem is I have a hole in the plastic box and the ac condenser is busted up also

I filled it with foam as a temp fix, so the hot air doesn't escape.
Fixing the condenser is a big job am I right?

 

[ccapehartusarmyINF.(ret)]

LOL here in az i dont think ive even turned on the heater maybe once or twice in december
is about it Dam i should check and see if my shit even works

 

[SunlitComet]

Well turns out the problem is I have a hole in the plastic box and the ac condenser is busted up also

I filled it with foam as a temp fix, so the hot air doesn't escape.
Fixing the condenser is a big job am I right?

yes the a/c system needs to be discharged and the hvac assembly completely removed if you actually mean the evap in the same box. for the condenser in front of the radiator it is easier to get out.

 

[SunlitComet]

LOL here in az i dont think ive even turned on the heater maybe once or twice in december
is about it Dam i should check and see if my shit even works

not actually turning on the heater per say but opening the water valve to the heater core.

 

[joeshark]

Ugh so aggravating, so this didn't do the job. It's still intermittent heat, same as before. The hole is definitely patched. The problem may be something mechanical, not triggering the heat. Turn the truck for one ride & I have nice strong heat, turn it in another time & have just cool air. Any thing else I could try?

 

[SunlitComet]

you have a hand vacuum pump with a gauge on it?