I checked the hoses. both are hot. could it be the plastic selector door behind the jockey box? my father suggests the thermostat. but the temp guage is steady and in the middle, so i wasn't thinking it would be the stat.
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Re: re: no heat, but plenty of air 1996 explorer
Not the stat ,its either the heater matrix is partaly blocked or if it has a shut of f valve?? this ia an american model and iam in spain ,never seen one ,and the shut off valve/tap isnt working but i ahavent seen a valve in years,normally a flap opens alowing the air through over the matrix core .look for thin plastic pipe under the dash thats connected to a round valve with a lever attached.Ifyou are getting some heat then the heater unit might need flushing with a hose,seal the heater pipes off with a couple of pairs of mole grips and give it a good flushing before you do anything else.do the heater hoses feel soft ??or crunchy when squeezed.dont forget the antifreeze .right can i go out now to see the girlfriend ,but dont tell the wife as shes gone to bingo
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If the heater hoses are hot, odds are the blend door that controls air temp is stuck or otherwise not moving. There are three blend doors under the dash.
You may need a shop manual to get the instructions on how to test them.
check heater hose to see if bothj are hot there is a valve in one of these hoses which controls the water flow to heater core,check these to see if working ,after that check to see if the blendair door in the evap box is closing when you move the selector from cold to hot you can hear the door open and close under the right side of the dash if not then you will probably need to see a shop from there
check your heater control cable and check your coolant control valve for vacuum operations. control valve located under hood @ coolant hoses leading to the heater core. cable operates a blend door inside truck under dash/behind glove box.. this should help
blend door motor behind glove box is very weak. drop glove box door down. on top of fan box is a 3x3 cover over the blend motor, 3 screws hold it down. replace it,about 70 bucks or i just turn on heat and tap on the cover with a pocket knife to start it moving. it gos to heat,leave it alone.
1) Make sure your coolant level is FULL.
2) Check your thermostat, it may be stuck open, not allowing the engine to heat up sufficiently to heat the heater core. Have you noticed the temp. guage running cooler than before?
3) Could be the mixing door. This is the door that opens allowing hot air from your heater core into the box that the blower motor circulates the hot air through your cabin with. This maybe happening because the cable that opens the door is malfunctioning.
4) If all this fails, call your local auto parts store and ask if there is a eletromechanical valve in your heater hose. If there is, just buy it and install it if its cheap enough.
Everyone jumps to the thermostat because its a good place to start. If, when the engine is truly at op temp, the upper and lower radiator hoses are both hot, its not the thermostat. If you have the temp control to hot and both heater core hoses are hot, its not the valve or control. Check the blend door actuator (behind the glove box), and then the blend door itself as it may be broken (its plastic) and not closing off the cold air.
you may have abad hot /cold blend door acuator.its bolted to air box. also make sure both heater hoses going to heater core are hot,if only one is hot and the other is luke warm or cold then you may have a clogged heater core,remove hoses (@ core) and flush with water hose go both ways a couple of times. good luck hope this helps.
i would guess your heater blend door is sticking. It is a rectangular door that moves back & forth to allow either cold air or hot air or a mix out of your vents. This is not an easy fix. But first be sure you heater hoses have hot water flowing in and out of the heater core. Under the hood you should find 2 hoses going into your firewall on the passenger side.
feel the hoses when engine is hot to see if the water is circulating,before you do anything else.If one is hot and the other cool then its not circulating,and heater core need a good flushing with some some caustic soda