Why does my heat suck!!

[Motodox]

I'm going crazy , I let my '00 Silverado z71 truck warm up for 15 mins and my heat still sucks. Seems like when I'm driving for hours on end it may warm up. But it's just really inconsistent. I put a new thermostate in and truck runs at 190-200 *f no matter what. My blower motor works on all settings and I have clean cabin air filters . Idk I don't get it sometimes it will actually blow hot air but most the time it's just warm and takes forever to just get to warm air blowing. Even my foot controls defrost all that works like it should .

 

Could the actual hand controls being going bad. Where I switch from heat to cool. Because sometimes I'll switch to blue (cold) and it really doesn't change anything. It still stays blowing the same "warm" air. But then sometimes it will actually switch to cold air .

 

I need heat badly please help!

[Chevy Joe]

Hi Travis,

Blocked or Restricked hoses going to the heater coil?

[O_J_Simpson]

Make sure truck it at 200-210F. Take an inlet outlet core temp. If both are fine, replace the actuator. If they are not fine, you have a plugged line or core.

[Mike Trnka]

the blend door could be sticking. I had a '01 silverado that had it stick on heat. Sometimes cycling the ignition and rotating the hot/cold knob would get it to move. It was either an actuator going bad or dust/dirt build up on the gears/door.

 

could also be an air bubble in the heater core from when the cooling system was partially drained.

[Motodox]

All great advice thank you guys.

 

On getting any air out how would I do that?

 

Also where are you measuring temps at? On the heater core two lines on the firewall?

 

Got a new thermostate shows 190' in the truck gauge.

 

I'm leaning towards it being a blender door problem.

[Chevor]

I had to replace an actuator on my 2010.

[Mike Trnka]

All great advice thank you guys.

 

On getting any air out how would I do that?

 

Also where are you measuring temps at? On the heater core two lines on the firewall?

 

Got a new thermostate shows 190' in the truck gauge.

 

I'm leaning towards it being a blender door problem.

 

if the heater has air in it, you may hear the coolant moving through it at start up or when you rev the engine. I know my dodge has some in it. The best way I know of to get air bubbles out is to pull the cooling system into a vacuum. They make special tools that connect to your radiator cap, they work really slick.

 

If I was going to bet on it, I'd say its the blend door sticking though. You just have to dig in and see what you can get to. I never looked into my silverado's. I just traded it off in the winter.

[Motodox]

Yeah I actually used to hear it like bubbles and liquid making noise in the heater core. It doesn't do that anymore so I'm assuming the air has worked it self out.

 

The blender door, is this a pain to get to?

[Mike Trnka]

found a video... actually looks pretty easy

 

 

[js3810]

Do easy things first... Take the heater core inlet and return hose off and flush out the radiator with a hose, and if water comes through then use compressed air. Repeat a couple times then hook it back up and see if your heat works. It fixed mine, and my heater core bubbled like your did too.

[Clay_Lucas]

I just did my water pump and my heater barely worked after amd only when higher than idle RPM. Found out I had a lot of air and it was stuck in the heater core. Took me a couple dozen time "burping" it to get the air out.

 

Park on a hill, let it warm up with heat on all the way and leave the cap off of the res. Took me quite a few times to get it all out.

 

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[BLACK DEATH]

My truck did the same thing as yours did.

Remove both hoses going to your heater core and flush them both a few times.

I bet you'll see all kinds of gunk come out.

It seems to me that every year I have to do this and my truck is an 01.

I just replaced the thermostat as it wasn't working to well and I flushed as much as I could out of everything.