Question about 2002 Chevrolet S-10

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I cant get the heat to work anymore, A/C is fine, heater core is good,

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The Number 1 issue with no heat, is AIR. Air can get trapped in the heater core resulting in no heat. when Cold, open the system and run it at a high idle... about 1500rpms, driving it a short distance will also work, with the cap loose so it can burp any air trapped, then top off the coolant. A pint low is all it takes.

Posted on Jul 21, 2009

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Posted on Jan 02, 2017

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Both hoses are hot, heater core not clogged, blend doors work fine (already check via cutting in the assembly for repair), blower works fine, luke warm heat coming out 1999 jeep grand cherokee laredo


ok, its just a heat exchanger.
all that matters for heat is:
1: the engine must reach 180F + and hold, does it.???
we use the scan tool , is ECT reading that, good.!

or hand IR pyro gun,,, pointed at the thermostat housing
then pointed at both heater hoses.... what do they read.

2: the hot water must flow through the core, must.

3: air must flow through said core. (damper or dirt blocking core)

1,2,3.
gotta be...

back flush the core? yet? see it flow good?

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No heat 98 ford f150


verify heat is in normal range using dash gauge. if its normal then good. if it is below normal, you may have a sticking open thermostat not allowing heat to build up enough for "hot" heat. but usually luke warm heat will be this issue.

If everything is fine with gauge heat, check the hoses going to your heater core with your hands. they BOTH should be hot. If one is hot and another is warm then you have heater core issues. If both are HOT then you may want to check your temp controls. either temp control may not be working or the door that changes temp may be stuck in the cold position... there are many things, but checking the heater core hoses are most likely going to reveal bad heater core.

You will need wiring diagrams and volt meter to diagnose anything other than touching hoses and looking at gauge.

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The heat in our 1998 continetal doesn't work. We replaced our thermostat. Still on heat. The a/c works fine. The vehicle run fine without any sign of over heating. We can't undrestand why the car's heating...


Two possible reasons, one is that your heat control valve that directs hot coolant to the heater core may be stuck or blocked. Two, you may have an airlock in the heater core that prevents water getting in to the heater core. You need to let the air out by loosening the upper most hose that feeds the heater core.

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2002 taurus, power windows all stopped working at once along with lighted window switches. Drivers window stuck down. Relay was hot! Also heater blows cool air, started doing this after I added radiator...


LOOK FOR BLOWN WINDOW CIRCUIT BREAKER.YOU HAVE A SHORT IN WINDOW SWITCH OR BAD WINDOW ELECTRIC MOTOR.YOUR HEAT PROBLEM IS A STOPPED UP HEATER CORES.THE STOP LEAK STOP ITS HEAT.THE STOP LEAK HAS STOPPED OR PLUGGED YOUR HEATER CORE SO COOLANT CANT PASS THROUGH IT.YOU GOING HAVE TO FIX RADIATOR LEAK AND REPLACE HEATER CORE TO GET HEAT AGAIN.

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No heat,engine temp.is normal


the valve that allows the hot water into the heater core is not opening. most likely electronic issue. also check all vacuum and electric lines.

Nov 03, 2009 | 2000 GMC New Sierra 1500

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No heat, heater core is good,blower moter works


Check the operation of the heater control valve. If it doesn't open up no heat. If the cable moves the control on the valve take the valve off and check it manually. The lever may work but the valve still doesn't open.

Sep 30, 2009 | 2002 Mitsubishi Galant

2 Answers

Cant get heat to the inside


Have you checked to see if small vacuum line on firewall under the hood is a-ok ( no breaks or cuts) it's usually on passenger side and goes through the firewall to inside.
Also I think when the heater core goes out you have no defrost either so when it is cold and wet outside your windshield will fog up.Also did you check your fuses.

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