Question about Ipcw Chevrolet S10 / S-pu 1998 1999 2000 2001 2002 2003 2004 Head Lamps Projector Clear Chevy Only-1 Pair

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Heater control valve location 2003 s10

Heater only blows hot air occasionally. when working, both hoses to core are hot. when not working, only inlet hose is hot and outlet hose is cold

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Sounds like you have a clog in the heat exchange. What color is the radiator fluid? You might be able to cut the hoses and flush the coil, but better would be to remove the hoses and get a piece of a hose and try to flush it then reconnect the old hoses unharmed.

Posted on May 15, 2014

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2 Answers

Mt car blows cold air but not hot i replace the thermostat and added antifreeze but it still no hot air its for a Mitsubishi lancer 2003


there are two hoses than run through the firewall to the heater core. With the car fully warmed up those two hoses should be about the same temp. If one is hot and one is significantly cooler that the heater core is likely plugged. The hoses can be removed and the heater core can be backflushed with a garden hose. do this several times alternating between the inlet and outlet of the heater core. reconnect the hoses and see what happens. Worse case scenerio you'll need to replace the heater core.

Nov 29, 2015 | Mitsubishi Cars & Trucks

1 Answer

It just blows cold air. no hot air


First, make sure your coolant level is full. After spending some time looking around you probably have a shut off valve in the engine compartment. See if you can locate 2 black(sometimes red) heater hoses, about 1 1/4 inches in diameter, coming from the firewall on the passenger side. The heater control valve is located inline with the hoses. It turns on and off the flow of hot water through the heater core which radiates heat in your passenger compartment. Check with your parts house to verify this by looking up the control valve.

Dec 26, 2014 | 2001 Ford Windstar

1 Answer

How do fix a/c on 2003 yukon it blow cold then hot than back to cold


A few possibilities:
Stuck or inoperable Air-flow Diverter:
There are tow types of air-flow diverters: Vacuum Actuated and Slide-Cable Actuated (some will have an electric solenoid that controls a vacuum actuated type). In either case the default position of the diverter is "cold air" or closed - blocking air flow over the heater core. Sounds like it may have a vacuum actuated control - when it looses vacuum it will let the air-flow diverter swing shut blocking off air blow through the heater core resulting in "cold air" Could be a bad control/slider, bad or loose hose, or bad actuator. If you remove the blower motor assembly you will be able to see the diverter and might be able to tell the issue is.
Stuck or inoperable heater valve:
This valve controls the flow of engine coolant to/through the heater core. It is normally closed - blocking flow. This can be vacuum operated or cable controlled just like the air-flow diverter. Simple to check - in the engine compartment, to the left of the engine locate the cooling (heating) lines that go into the fire wall - locate the valve and check its operation.
Another possibility is low coolant level in your engine/radiator which may be too low to allow flow of the coolant through the heating coil, although you would likely notice that the engine was over heating/running hot.

Sep 13, 2014 | Flex A Lite 2003 GMC Yukon XL - 6.0L V8 -...

2 Answers

1996 chevy s10 pickup blows hot air all the time. even with everything turned off.


In my case (1995 S10) it was as simple as the temperature control potentiometer. The pot contacts were crushed, God knows what breaks and shorts happened there. Replaced the pot and all works like a charm. 3ffe43e2-1688-4bb5-ad86-58f1c719150e.jpg

Oct 21, 2012 | 1996 Chevrolet Blazer

1 Answer

Heater stoped blowing out hot air


Your problem can be caused by a bad thermostat, bad heater control valve, a heater door that's not opening or a clogged heater core. If the thermostat is good, check your heater hoses when the heat is on. Both should be hot; if one isn't there is a vacuum operated device inline with one of the hoses (heater control valve) make sure the vacuum line is connected to it. Sometimes you can manually force the valve to move; if you can do it and see if the 2 hoses get hot as a result. If they do, change the valve. The heater door is inside the vehicle and it too is usually vacuum controlled and often somewhat involved to service. I'm not sure of the exact configuration of your heater core but they too can become very involved to replace. More than likely the heater core isn't clogged and there's a very good chance you just have a sticking heater control valve.

Jun 23, 2011 | 2003 Chevrolet Impala

1 Answer

Engine heats up but takes a long time for warm air to blow. Once working, the thermostat works fine. Sometimes, warm air starts to blow and then goes cooler.


low fluid level or heater control valve may need replace..check hoses going to heater core...if cold...between heater control valve and heater core..replace control valve

Jan 11, 2011 | 2003 Toyota Matrix

1 Answer

Hot air blows but cools down in 15-20 seconds.


You likely have a restriction in the heater coolant hose circuit - perhaps a coolant control valve not fully opening, or a kinked hose.
Insufficient coolant volume is flowing to keep the heater core hot.
Try back flushing the heater core system with a garden hose to check flow.

Nov 13, 2009 | 2003 Audi A4 Cabriolet

2 Answers

There is no heat come out of my heater for a 2003


It's more likely you need a new thermostat. A bad thermostat will impact the heater. If it's the heater core, you often will get a pool of coolant in the inside of the car by the passengers floor. You also may get a mist when you select the defroster.

Oct 25, 2009 | 2003 Buick Regal

1 Answer

Heater doesn't blow hot air


First check the coolant level in the radiator. Check your heater core hoses on the firewall underneath the hood. Let the car come up to temp. and feel the two hoses. If only one of them is getting hot you may have bad heater core or a bad heater control valve.

Jan 04, 2009 | 2003 Dodge Intrepid

1 Answer

Heater only blows warm air.


The hoses from your heater core should be very hot to the touch. Check the hoses going to the core from the water pump. It should be very hot. The return hose should also be very hot. Now check the hoses going to the core. If they are not the same temp, then your heater control valve is not working correctly or the vacuum is not working. At any rate, locate the vacuum line going to the heater valve. Remove the silver bar on the valve from the plastic plunger arm. You will have heat all the time now if it was only a vacuum problem. You can fix it later when it's warmer out. BTW a 200* thermostat will make your heater even hotter.

Nov 21, 2008 | 1998 Jeep Cherokee

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