Heat issue 4.3 s10

[4x4ZR2]

changed t-stat now it warms up to 160 at idle in the driveway and the heat is much better now. thanks guys. might still try and blow the heater core out again with the hose once the temps warm up and my spigot thaws out.

[85cHeavyMetalBogger]

are you running a 160 t stat?

[4x4ZR2]

i put a 195* since thats what it called for at the store. just went for a short drive and it heated up to 195* and the heat works great. actually had to turn it off it got so hot lol

[old school truck dude]

what about compressed air? my spigot is frozen out side

No, compressed air wil make it explode Hold both hoses up higher than the core and pour CLR in there, let it soak in for a while then back flush, it will be like show room new.

[4x4ZR2]

what about compressed air? my spigot is frozen out side

No, compressed air wil make it explode Hold both hoses up higher than the core and pour CLR in there, let it soak in for a while then back flush, it will be like show room new.

guess i got lucky. lol but i didnt blow 200 psi through it or anything. just enoungh to move the coolant and fresh water through it. also read some bad reviews about putting clr in it as it eats away the aluminum.

[lilred]

I'm having similar issues too. Hopefully have time to mess with it soon, doesn't even blow hot enough to melt ice off the windshield.

[85cHeavyMetalBogger]

I'm having similar issues too. Hopefully have time to mess with it soon, doesn't even blow hot enough to melt ice off the windshield.

its easy and doesnt take long

[old school truck dude]

what about compressed air? my spigot is frozen out side

No, compressed air wil make it explode Hold both hoses up higher than the core and pour CLR in there, let it soak in for a while then back flush, it will be like show room new.

guess i got lucky. lol but i didnt blow 200 psi through it or anything. just enoungh to move the coolant and fresh water through it. also read some bad reviews about putting clr in it as it eats away the aluminum.

5 minutes or so, flush it real good, it would be fine

[chevyjake]

Gumout also makes a radiator flush you can use.  Id flush the radiator an heater core by them selfs an then flush out the whole system. 

[buddman (AKA Mick)]

Is the coolant all brown n muddy lookin??  If so it needs a complete coolant flush then heater core flushed seperatly. Otherwise the heater core will just plug up again. I deal w this everyday at work. GM vehicles are the worst!!  We use a flush gun hooked to a garden hose n shop air. Just gotta use ur head on how much air presure u use.

[jbeery78]

Id start with a stat... 120 isnt anywhere NEAR warm enough. May have gotten a bad one. Get that truck runnin around 190 degrees like it should be i bet after that and that backflush u will make some heat

[jbeery78]

Id start with a stat... 120 isnt anywhere NEAR warm enough. May have gotten a bad one. Get that truck runnin around 190 degrees like it should be i bet after that and that backflush u will make some heat

Haha nevermind i missed page 2. maybe i need glasses now haha