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Chevy Owners PLEASE HELP

C

chevyblazerladyinPA

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:confused: Hello Blazer owners I am a new Blazer owner just bought my first 4 months ago. Got a 2000 Chevy Blazer ( my dream vehicle).I have always wanted one. Well I am having troubles and no one seems to know what could be causing it. I have no heat. and with living in PA with temps lately in the 20's everyday it gets pretty chilly without a heater. It is odd had heat till Thanksgiving day, went out and started the truck and just didn't seem to warm up. I thought might be due to that it was only 11 degrees out, the next week had heat back but it was warmer too.
Now this past week i barely have any you can feel it there, but just no where near as warm as should be or was. Now I have had talked to about 10 different mechanics including my dad who has worked on Chevy's for 40 yrs. They all seem to be lost. Seems to be blowing both cold and luke warm air. We have changed the thermostat. The fluids are full the radiator is full. The hises that go into the heater core are warm to touch, but i was told you should not be able to sit there and hold them and you can.
Please Help!!!
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:confused:
 
It could be a clogged heater core. Find a warm shop or garage, remove the 2 hoses that go into the heater core, get a water hose and try blowing water through each fitting. If it is clogged that should get it out.

Ira
 
Thanks

Thanks,
I am just getting done work for the week and had heard about that. My cousin has a garage and am going over there Monday morning to do that.
I heard something new today that has been making me think.
What you think about that DexCool stuff. I heard that it is known for clogging heater cores and radiators.
What you think??
 
If dexcool is the orange stuff I do not think that would make sense. That stuff is basically Phosphate free anti-freeze. Since there is no phosphate I would think it would foul things less. No chemical proof or anything just my beliefs. I run that in my Saturn and it does not have any problems. To my knowledge it was designed to be run in motors with aluminum blocks and/or heads.

Ira
 
I would look for a problem in the controls for the heater core /ac air box. Also, does it have a vacuum controlled heater core to engine block hose? Look for broken vacuum lines, bad fuses too.
 
Ok thanks for the good advice i know the hoses that go into the firewall are warm to the touch, and look as though there are no leaks. Have not been seeing any fluids leaking out anywhere.
My temp control stays normal. All the blower controls and temp controls turn from off to on and you can hear them when they go from one to the other.
 
sandawgk5 said:
If dexcool is the orange stuff I do not think that would make sense. That stuff is basically Phosphate free anti-freeze. Since there is no phosphate I would think it would foul things less. No chemical proof or anything just my beliefs. I run that in my Saturn and it does not have any problems.
Click to expand...

if/when it mixes with conventional ethelyne glycol antifreeze, it will gum all sorts of stuff up with a brown sludge. IMO, this stuff is garbage. rather than wasting your time trying to flush the heater core, take it to a radiator shop, and have the entire system power flushed free of the Dexcrap, and have fresh conventional green antifreeze put in.
 
The heater controls in the newer blazers are a PITA. Had one in the garage a weeks ago for the same issue. He had a cracked vacuum line and the head controller was bad.
If you end up needing a controller i can get you one from my neighbor. He has a totaled blazer in his garage....trying to part it out.
 
My all iron 4.3 in my 99 Jimmy ran Dex-Cool from the factory. It's a very low maintenance coolant. 10 year, 100,000 mile change interval I believe.

How high does your temperature gage go in the truck while you are trying to get heat? If it does not go up to half-way between 100 and 210 on the gage, you either have a stuck open thermostat or a fan clutch that is stuck on all the time.

Pretty much, these are your ideas...

1. Stuck open thermostat
2. Bad fan clutch (on motor)
3. Blend door/heater control unit problem
4. Clogged heater core

I really do not believe it is a clogged heater core, and that should really be the last thing you check, since if it can clog the heater core, your radiator would be clogged as well and you would be overheating the truck....even in 20 degree weather.
 
If you squeeze one of your heater hoses you should be able to feel the coolant flowing by. If you feel it flowing then it's not clogged.
 
clogged heater cores are pretty common on s-10s.....................



mixing dexcool and conventional doesn't make sludge, just drops the additive package to less then the green stuff, and all that you've heard of dexcool clogging stuff is kind of true, but it is AIR that gets in the system(from a leak, ect) that make dex sludge up
 
those year s/t trucks are known for heater cores plugging up. Especcially if you have had any point where your coolant has gotten a little low. Dexcool works fine in a sealed system with no air in it, but the moment it starts to get airated it produces a gel like substance.
 
My fluids have all ben at a good level. The only time I had to add any was when we changed the thermostat.
I have had so many things told to me. My father who I said has been a GM mechanic for 40 yrs said also to check the vacum hoses.
What ua think about that? I would just go to him but he lives more than 1200 miles away now.
Thanks
 
dave_90_blazer said:
mixing dexcool and conventional doesn't make sludge, just drops the additive package to less then the green stuff, and all that you've heard of dexcool clogging stuff is kind of true, but it is AIR that gets in the system(from a leak, ect) that make dex sludge up
Click to expand...

think what you want, i know what i've fixed, and know that the system had no leaks. while i agree, air does cause it to sludge, so does the green stuff.

as for the 100,000 mi service interval, if you believe that, you're probably also the same type of person that gets a week out of a pair of underwear.
 
beater_k20 said:
think what you want, i know what i've fixed, and know that the system had no leaks. while i agree, air does cause it to sludge, so does the green stuff.

as for the 100,000 mi service interval, if you believe that, you're probably also the same type of person that gets a week out of a pair of underwear.
Click to expand...

I agree there, I have a 04 Blazer Xtreme that needs a flush, and it has only 27K on the clock
 
That's what it said in the manual, but it doesn't excuse it from regular checks......just stating fact guys, don't freak out on me.

Strange...I've had four S10's and never had this plugging problem...
 
Are you taking it to a shop, or are you trying to do it yourself?

What about your temp gage? You never told us how warm the truck gets in the first place. If it's not even getting warm, you won't have any heat.
 
I've heard bad about the vacuum heater controls. Not always working right. I also seen the orange antifreeze gum up. I've flushed my 963500 when I got it, and got globs of it coming out of the lower rad hose. (it plugged up the petcock bleeder) I put green Peak in that is compatible with all types of antifreeze, and metals.
 
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