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2000 blazer ls heater problem. Changed thermostat still no heat. is there a shut off valve thats likely or maybe a plugged core

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I'm not sure if you heater control valve is vaccuum operated or if it cable operated. If it is vaccuum operated the valve could be bad or you have a vaccuum leak to the valve. If your valve is cable operated then you most likely have a clogged heater core. Please rate my answer.

Posted on Dec 09, 2009


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98 ford ranger no heat have changed thermostat water pump heater control valve

Maybe the heater core is plugged or you haven't bled it properly?
If the heater hose returning from the core to the water pump is NOT hot, while the hose going to the heater core from the thermostat area IS hot, then the heater core is plugged probably.
You need to remove the heater hose while cool,from the thermostat area and remove the hose from the water pump area (that's the outlet of the flow thru heater core) AND THEN take a garden hose with p-is-tol grip type sprayer,and blow water back thru the outlet hose out the inlet hose. This will blow any bad plugging material out the way it got in.
Don't apply too much pressure if it is plugged bad. The heater core isn't made to stand 50lbs. water pressure. don-ohio (:^)

Dec 31, 2016 | 1998 Ford Ranger

2 Answers

Replace heater core

No heat can be because
1. Engine not hot due to thermostat stuck open.
2. Heater fan not running
3. Heater core not flowing water due to
a. plugged
b. hot water valve not opening

Jan 27, 2015 | 1996 Chevrolet Blazer

1 Answer

I have a 2001 Lincoln LS with a 3.9L, I changed the heater core, and the OGM heater line that had a crack in it. I alos topped off the antifreeze, I ran the car for 20 minutes and felt all the heater lines...

Your problem could be caused by an air bubble in the heater coil. Take off the thermostat, turn the heater control valve off and on. If it starts working, replace the thermostat. If not, it is probably the heater control valve which will need replaced.

Apr 05, 2014 | 2000 Lincoln LS

1 Answer

No heat on my2004 lincoln ls

Thermostat has nothing to do with the heat

You have a coolant control valve down low under
the a/c drier on the passenger side, bolted to the
radiator shroud

I have that car,very complicated vehicle,one of the
most high tech ford has every made

Beside that valve there are several other possiblities,
mostly all electronic

Need the experience & all the diagnostic manuals or
I hate to say it,but maybe a dealer,not many shops will
work on a ford or an LS

Jan 24, 2013 | 2004 Lincoln LS

1 Answer

I have no heat in my lincold ls it just blows cold air

coolant not getting to the heater core because of obstruction or problem with the valve. Or switch that opens the valve to the heater core is malfunctioning or stuck shut. Even could be that your thermostat is stuck open and the coolant doesn't heat up enough. Could be some other stuff I suppose, but it's beyond me.

Dec 20, 2010 | Lincoln LS Cars & Trucks

2 Answers

My 2000 lincoln ls heater is still not working after i changed the thermostat and water pump,and blowing cool air out. what can it be?

Check the 'heater control valve,' which is attached to the heater hose line under the hood. If it is malfunctioning, it will prevent hot coolant from reaching the heater core, with the result being no heat. This is a $30 part, usually not too tough to get at, although I've never changed one on a Lincoln.

Mar 21, 2010 | 2000 Lincoln LS

1 Answer

My Lincoln LS has no heat. I changed the

mine was the same. I took it out on the hiway and ran it at 5 grand for about ten minutes and it seemed to flush out the heater core and now it works fine.

Jan 08, 2010 | 2000 Lincoln LS

2 Answers

I have a 2000 Chevy Silverado pickup, and the heater will not blow hot air. I replaced the thermostat, and nothing changed. The radiator was flushed and filled in the last two months as well. I have all...

once truck is warm check both heater core hoses to make sure they are both warm if not then check the cold water valve could be stuck shut not allowing coolant to travel in to heater core.

Jan 05, 2010 | 2000 Chevrolet Silverado 1500

1 Answer

How do I replace heater core on 2000 LS Blazer

if it is plugged remove the hoses from the intake manifold and water pump and hook a garden hose from hot water to it and blow it out in reverse and your heat will work again

Apr 20, 2009 | 2000 Chevrolet Blazer

1 Answer

No heat,ch.thermostat,water is circulating,blower goin strong .

Check the 'heater control valve'. This valve opens when u turn on the heat switch on the dash, so the hot coolant will flow thru the heater core and provide heat. So although the coolant is circulating in the engine, the valve controlling the flow to the heater core is stuck closed, or not working.

Nov 15, 2008 | 2000 Ford Focus

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