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2001 mk triton 3.0 litre v6 no heat from heater hoses are hot going through engine over heats while idling got new t-stat in

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  • Cars & Trucks Master
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Is there an air bleed on top of the thermostat housing? If not, when it's cool, remove the radiator cap and start engine.
Let it run until water rises up to top edge of radiator cap lip.
A little air in the cooling system can cause this problem.

once the water rises to the top, put the cap on and shut engine off.

If you see a bleed screw on top of the waterneck/thermostat housing, just loosen it a little at a time while the engine is running and warm.

If you see air bubbles, let it keep going until its a smooth flow of water.

DO NOT REMOVE ALL THE WAY.

this is all assuming that your fan and water pump are working fine.

Keep spilled coolant away from pets. poison.

Posted on Dec 07, 2012

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  • Master
  • 369 Answers

First the fact that both heater hoses are hot means that coolant is circulating through the heater core so you need to check and see if your blend door in the air duct is switching to the heat duct side. The blend door is a door that switches from from the cold air duct to the heat duct if it doesnt switch youll never get any heat. I will assume the blower is working. If the blend door isnt switching youll need to find the small motor that makes it switch on some vehicles they used to use a vacume operated valve that would open and close the blend door if yours is vacume operated you need to make sure that vacume line is not broke and has vacume applied to it when you switch the control to heat. Most the time when you find out where the blend door is at you can see the valve or motor and visually see if it moves when you switch you controls to heat. As for the over heat I hope that thrmostat fixed your problem if not check the fan clutch or electric fans if you have them.

Posted on Dec 07, 2012

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Posted on Jan 02, 2017

  • 74 Answers

SOURCE: No heat

confirm coolant flow to heater core and flow out of heater core

Posted on Sep 24, 2008

  • 1779 Answers

SOURCE: 97 f 150 runs hot for minutes then runs ok

It could be a faulty thermostat. Did it do the same thing before u replaced the t-stat? It sounds like it's sticking closed, then all of a sudden it opens, coolant flows correctly. I'd consider changing it again. Check to make sure parts store is giving u the correct temperature thermostat also. Maybe it's too high for your Ford, delaying the opening.

Posted on Nov 25, 2008

  • 7353 Answers

SOURCE: 2002 dodge 1500 Changed radiator, thermostat, and hoses. No heat

Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.

Posted on Nov 19, 2009

iambanshee74
  • 3489 Answers

SOURCE: 04 sebring 2.7L V6, not hot air from heater at

check your coolant level and make sure its bled. if its full the next thing to do is to flush the system and with a flush chemical(any autoparts store about $10). refill with fresh coolant and distilled water and make sure system is bled by turning on the heat while refilling the system.cheers

Posted on Jan 07, 2010

j_del
  • 1586 Answers

SOURCE: BOTTOM RAD HOSE COLD TOP HOT. ENGINE TEMP ABOUT

Did you burp the air out of the system after changing those parts? It sounds like the thermostat isn't opening which is why the lower hose is still cold. Click my screenname, go to my tips and tricks, and choose the one about burping the cooling system - it may help you out.

Posted on Jan 28, 2010

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The reply would have been with your question if it got answered.
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