Question about 1998 Ford Taurus

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Hot water is going to the core but no hot air out of the vents. I trying to squeeze the bypass hose to get water to force through the core and still nothing out of the vents?

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Hi, Is both hoses hot going in and coming out of heater core,if not heater core is stopped up. If both hoses are hot. check the blend door motor and door its self to make sure its not broken. if i can further assist you just re post. Thanks dodge tec

Posted on Jan 03, 2011

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1 Answer

I have a problem with cold air from heat vents.


The bypass valve may be stuck open. Try working it manually to see if it is sticking . Valves are usually vacuum or electric . If vacuum actuated, check vacuum lines for cracks or holes. If electric, make sure wiring is intact and properly connected. You may be able to disconnect acuator and manually open valve. Valve may need to be replaced also.
Hope this helps.
Bob

Dec 16, 2014 | 2004 Hyundai Elantra

2 Answers

Where is the bleeder valve located to bleed any trapped air from getting to the matrix? Why would I not be getting hot air to any of the vents?


Not sure if there is a bleeder valve on these. Not giving a description of what was going on makes it difficult.You may have a plugged heater core. Maybe low coolant. Sometimes it needs to be bled off with a vaccuum drawing the coolant through the heater core. Part of the problem is with these the heater core is higher than the cooling system so the coolant doesnt natrually flow into it, it takes some type of external force to make it go in. I have had luck getting the nose of the car up on car ramps to get the core lower and its naturally started flowing. That is if there is not an obstruction preventing it from doing so.

Nov 12, 2014 | 2004 Pontiac Grand Am

2 Answers

No heat ,


Check the vacuum lines to make sure they are correctly connected and in good shape. If they are not, then the system wont move the dampers to allow hot air into the heat vents. A second possibility is a clogged heater core, which is not allowing hot water to circulate through it. As you say the head has been replaced, I would have someone insure every thing was reconnected correctly. It could be the hoses to the heater core are reversed!

Jan 18, 2013 | 2000 Ford Taurus

1 Answer

My 2000 mercury sable the heater blows warm air not hot. the coolant has been checked and the thermostat has been changed still no heat. what could be the problem


Have you checked for air in the system ? Some of the V-6 engines have an air bleeder on top of the intake manifold to release trapped air. What you do is fill the rad to the top , start the cold engine and open the bleeder untill fluid comes out meaning the air has been vented. With air in the system the heater does not transfer heat efficently. You can also vent an engine by squeezing the upper radiator hose with the engine off and cold. Never open a hot system. The squeeze method is easy. With cold engine remove the cap and fill the radiator almost to where it will spill over. Then slowly squeeze the upper radiator hose and you will see the air escape. When you release the prussure you will see the level drop slightly. Now if you do not have air in that system you will need to check the heater core flow. With everything closed up and full start the engine and let it warm up. Now feel the two hoses in and out of the heater core where it goes thru the firewall in one is cold and one is warm then your heater core is plugged. You can try a flush at this point but it usually needs to be replaced. Thanks for asking at Fixya.com.

Dec 02, 2010 | 2001 Mercury Sable

4 Answers

1998 Ford Taurus, heater won't blow hot air through any vent including defrost, coolant level is okay, no heat no matter how long car is run, car doesn't overheat, can't get warm air even if run at air...


common problem is the water resivor cracks up at the bottom... it appears that your water level is fine because the car doesnt over heat but i am willing to bet that resivor doesnt have water to the top. The radiator will hold just enough water to keep it cool. I replaced mine 3 times the sulution is doing to sound weird but go to the junk yard and get one off a murcury sable. dont know why but the sables res doesnt crack like that

Nov 08, 2010 | 1998 Ford Taurus

1 Answer

When I turn on the air conditioner it is blowing hot air as if the heater were on. Could it be a fuse? It was working fine yesterday.


heater core is going bad my dodge ram truck did the same thing for about three months then steam startedcoming out of the vents it was antifreeze i have not fixed it yet i just bypassed it for now cause its hot and i have to take the dash completly out to get to it, and yes my airconditioner was blowing out hot now immediatly after i bypassed it blows cold again.you have to find where it goes into the motor on both sides so follow the hoses from firewall then buy a 3ft hose to go from one side of motor to the other problem fixed! well that is you wont have a heater until you change the heater core

Jul 07, 2009 | 1999 Mercury Sable

1 Answer

I want to flush the heater core


Take off the hoses at the bulkhead/firewall that go to te heater core, use a garden hose and back flush the core by forcing water through the smaller of the 2 hose nipples, if the water runs right through then you have a heater air temp control door actuator problem

Dec 24, 2008 | 2005 Pontiac Grand Prix

1 Answer

Defrost will not come out vents


Check your coolant level first. Next check your heater control valve. With engine at operating temp and heater on high, do this:

1. Heater hose from water pump should be hot (if not, water pump may be dead or thermostat is stuck closed)
2. Heater hose from thermostat housing should be hot (if not, thermostat may be stuck closed or water pump is dead)
3. Heater hose going to heater core should be hot ( if not, heater control valve is not getting vacuum from heater control unit, or valve is broken)
4. Heater hose returning from heater core should be hot (if not, heater core is blocked, undo both hoses to core and flush with water hose until clear)

Test thermostat: with cold engine cranked, watch water temp gauge. As it gets hotter and hotter, when the thermostat opens, the temp should drop suddenly and then go back up.

Test water pump: with engine at operating temp. Squeeze top radiator hose tight, when you release it, you should feel/hear a surge of water. It is much like when you pinch a water hose closed and release it.

Test vacuum from heater control unit to heater control valve: undue vacuum line from control valve. It should have a vacuum when pressed against you skin in addition to releasing the actuating arm on the control valve.

If there is no vacuum, a quick fix will be to disconnect the plastic actuator from the silver arm on the heater valve. This will let the hot water to always flow to your heater core.

Dec 17, 2008 | Jeep Cherokee Cars & Trucks

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