00' Silverado no heat

[ducati1]

are you flushing the hose or the heater core? I flushed only the heater core... I flushed the direction the fluid goes and it seemed to flow completely free using a garden hose.
I thought maybe an air lock but the RPM makes me think the water pump is not pushing enough...

[chevy393]

i have the exact same probelm as ducati, i have like luke warm to nothin coming out and if i put it on 4 or 5 its pointless cause it blows it so hard it turns into cold air lol. i was goin ot take it to a mechanic friend and see if he could dignose it or somthin, ill let yall know if i find anything intersting out

[johnny-Z]

That's funny becuase my heat will not turn off in the winter time even if I turn it off or turn on the A/C. Once it's on it won't go off unless I turn the car off and let it sit for hours with the temp on cold and A/C on.

However air continues to blow even when it is turned off. Is there a vent somewhere that I need to close?

How can I get the heat to turn off once I turn it on?

[ducati1]

I think I will try the reverse heater core blow out but I think my water pump is shot... both hoses should be hot all the time if I understand the design properly. If you are getting cold all the time it could be the trap door not moving, which I can hear mine move when I switch from cold to hot...

[j cAT]

Originally Posted by ducati1

I think I will try the reverse heater core blow out but I think my water pump is shot... both hoses should be hot all the time if I understand the design properly. If you are getting cold all the time it could be the trap door not moving, which I can hear mine move when I switch from cold to hot...

to have only one hose hot at the heater core means that coolant is not flowing thru the heater core...reverse and fwd flush out the core there should be no resistance to the flow...there are no valves...so it this is open and free flowing the most likely cause is the air bubble.....when reinstalling hoses I disconnect at the engine then when reinstalling fill heater core as best I can,,,,,,, then hook up hoses to engine...then run engine with the fill cap off and keep filling the res....rev engine to 2-3,ooorpm a few times to get the flow/air moving to the res ..do this until engine is hot...





IF THE HOSES ARE BOTH HOT AND NO HEAT THE CONTROL MOTOR IS BAD this is in the air box next to the center hump..

[ezdropper]

I have a problem where the temperature gauge goes up above normal, and the heat gets cold. After about a minute the temperature gauge goes back to normal and the heat gets warm. I replaced the thermostat and it seemed to work fine for about a month, but now it's doing it again.

[j cAT]

Originally Posted by slvbeard

I have a problem where the temperature gauge goes up above normal, and the heat gets cold. After about a minute the temperature gauge goes back to normal and the heat gets warm. I replaced the thermostat and it seemed to work fine for about a month, but now it's doing it again.

flush out the heater core..remove hoses at engine
flush the core out with a water hose into a bucket,,,if its black goop your gonna have to somehow cleanout all of the coolant system ..

dexcool and distilled water only....mixing of other coolants will goop up your system...

[ezdropper]

Originally Posted by j cAT

flush out the heater core..remove hoses at engine
flush the core out with a water hose into a bucket,,,if its black goop your gonna have to somehow cleanout all of the coolant system ..

dexcool and distilled water only....mixing of other coolants will goop up your system...

Checked the hoses to the heater core and one was hot and the other cold. Pulled the hoses off the water pump and flushed them and the heater core out, working great now.

[j cAT]

Originally Posted by slvbeard

Checked the hoses to the heater core and one was hot and the other cold. Pulled the hoses off the water pump and flushed them and the heater core out, working great now.

next time the coolant is replaced,,,always flush out the heater core,,,then blow out the flush water,,,this will ensure you have heat come winter...where I live it is very important this heater core works...

[myk55]

when the outside air temp is 20 degrees or higher I have heat in my 2000 chevy Silverado 1500. when its colder outside it blows cold air? and when I turn heat on I can smell antifreeze ( not all the time)? replaced thermostat and all my hoses seem to be heating up and my fluid level is good?

[rhandwor]

Put some cardboard under the air conditioning drip tube if it's stained your heater core is leaking. The stain should be the color of your antifreeze. Check the vacuum going to your blend doors. The control on the right has a lot of vacuum tubes make sure you have vacuum and it switches.

[myk55]

would bad knocking sensors cause my 2000 chevy slverado 1500 5.3l v8, To kind of lunge? when stopped? the rpm gauge fluctuates up and down and truck kind of lunges forward a little bit. And when its running it sounds like there is a delay? (like its going to quit running)? Not sure if I'm explaining the problem correctly?

[j cAT]

Originally Posted by myk55

would bad knocking sensors cause my 2000 chevy slverado 1500 5.3l v8, To kind of lunge? when stopped? the rpm gauge fluctuates up and down and truck kind of lunges forward a little bit. And when its running it sounds like there is a delay? (like its going to quit running)? Not sure if I'm explaining the problem correctly?

when you have issues you must not use another form members post issue. start your own new posting with the details of your vehicle spec's and what you have tested/inspected with what you have found.

you will get better / more results .

with no codes check the fuel pressure .. this requires a pressure gauge 53-62 psi.. squirts real good is not a test...AS SOME HAVE DONE. LOL...

[gtbreps_2]

I had an issue similar this summer. To the contrary, the temp control would work for a little while until it would change to max. heat and I could not make it colder, until I turned my truck off. It was the blend door actuator located under the center dash console. It was an easy fix. If that has gone bad, it won't move the blend door to control the temp.

[j cAT]

Originally Posted by gtbreps_2

I had an issue similar this summer. To the contrary, the temp control would work for a little while until it would change to max. heat and I could not make it colder, until I turned my truck off. It was the blend door actuator located under the center dash console. It was an easy fix. If that has gone bad, it won't move the blend door to control the temp.

if you have a heat problem @ 20 deg f or lower , this would be a dirty heater core or a bad T stat not closing enough to keep the engine temp @190 deg f. having a leak would effect the flow thru the heater core but that would effect the heat temp at all temps.

I put a thermometer in the vent and it does go up to 140 DEG F with the fan on the middle speed at all temps.. the heater core is like a filter debris collects there.