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99 ford f150 heat works fine but after 5 minutes of driving goes ice cold !! Changes heater core checked hoses checked switch checked blend doors flushed it twice everything!! Any advice?

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Could possibly be a vacuum leak. The blend door actuator controls are usually ran off of vacuum. It is possible that once the engine warms up, even though you have it to heat, the loss of vacuum will cause the blend door to switch positions.

Posted on Dec 26, 2013

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Posted on Jan 02, 2017

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SOURCE: No Heat for 2001 Chevy Blazer

All I did with my 1999 blazer is pull the a/c fuses from under the hood and heat blows just fine.
good luck

Posted on Dec 04, 2008

  • 61 Answers

SOURCE: 1998 ford f150- heat issue

There is no heater valve on a 1998 ford F-150. The hoses for the heater lead directly from the engine and go to the heater case. PS The heater doors are all vacuum controlled so you might wanna look under the dash for any lines that might be disconnected

Posted on Jan 28, 2009

  • 518 Answers

SOURCE: 1999 Ford Taurus, no heat.

Try checking the two pipes that go into and come out of the heater matrix, is one of them hot? if it is there is an air lock within the matrix, Also is the thermostat opening fully? Sorry i know you said you have changed it twice already but take it out check settings when it should open and close, then boil some water and test the thermostat

Posted on Dec 30, 2009

  • 118 Answers

SOURCE: i have a 1998 ford f-150 and no heat. i have

You just might have an air lock. Try bleeding the system from the heater hose at the firewall. Losen one hose a little, and at operating temp. open slightly to let air out. You will lose some coolant, but just refill the rad. Now, both hoses should get hot.

Posted on Jan 01, 2010

  • 23 Answers

SOURCE: 1998 ford taurus no heat,replaced

You might have to purge the coolent system cause when you change stuff like that you normally have to bleed the the colent system. So what you have to do is run the car untill your temp gets to 195 degrees the cut the car off and let the coolent drain down and then refill and geep doing that untill you have heat.

Posted on Jan 09, 2010

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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.

Oct 13, 2014 | 1998 Ford F150 Regular Cab

1 Answer

Heater problems f 150 2001 5.4


That is a hard one to call without seeing it in person. It could be a clog in the heater core (have you ever had it flushed?), a bad selector switch, or a bad blend actuator. I think the F150 of that year uses an electronic blend actuator similar to the one used in the Explorer (some of them are vacuum while some are electric), you'll have to look at the box to see why type it uses or if you can pull the panel off, check the back of the hot/cold switch. See if it has vacuum lines or an electrical connector. I know the Explorer has a fix kit because the electrical actuator will strip the gears and not change the door position easily or at all.

Jan 29, 2014 | 2001 Ford F150 Styleside SuperCrew

1 Answer

2000 ford expedition no front heat, back heat work fine. I went through the glove box and into the side of the heater box, the blend door works fine. Any ideals?


if blend door works blower working check make sure you have enough coolant because suvs holds right much antifreeze.heater not working heater core plugged make sure both heater core hoses hot to touch if so problem could be temperature mode switch.

Jan 21, 2013 | 2000 Ford Expedition

1 Answer

1999 ford f150 only blows cold air, blend door works fine and the heat core is getting hot. I moved the temperature dial towards cold the other day and the heat hasn't worked since. Please help. Thanks


the flapper door is not closing and opening properly...it is located in the duct work....remove heater control panel and follow the cable to the flapper door

Jan 26, 2011 | 2001 Ford F150 Styleside SuperCrew

1 Answer

Have ford f150 1996 wont switch to heat from cold replaced switch already


96' or 97' it makes a big difference. 96' models are very simple if you have a basic understanding of automotive work and some basic tools. remove the glove box, the heater core is located behind a panel just inside and below the glove box hole. first remove the plastic panel but not the heater core, to the left of the heater core inside the box is the blend door that separates the heater and A/C cores. this door is often obstructed by pens, pencils, or plastic junk that have fallen down into the defrost vents on top of the dash and landed in the box. something like this will stop the blend door from being able to close the A/C core off from the vents allowing cold air in. if you have big hands like mine you may need a woman or teenager to reach into the box and check for debris but you can see the door open and close when you turn the switch so you know where to check. if you have a 97' model the blend door actuator is electric and usually not accessible without removing the dash and heater/A/C box from the firewall. good luck

Jan 13, 2011 | 1997 Ford F150 Regular Cab

1 Answer

I have a 1998 ford f-150 and no heat. i have replaced the heater core, blend door and control switch. checked the blend door motor- works fine. have tryed 3 thermostats. when i replaced the core i back...


You just might have an air lock. Try bleeding the system from the heater hose at the firewall. Losen one hose a little, and at operating temp. open slightly to let air out. You will lose some coolant, but just refill the rad. Now, both hoses should get hot.

Jan 01, 2010 | 1999 Ford F150 Regular Cab

2 Answers

96 f150 inline 6 no heat


if one hose is too hot to hold onto,then your thermostat is good,but if both hoses are not the same temp you should replace the heater core,you can get maybe one or two of the heater core fins to open but there is a majority of them not letting coolant thru.

Dec 23, 2009 | 1996 Ford F150 Regular Cab

1 Answer

MY 1998 FOR TARUS HEATER WILL NOT WORK.WAS DRIVING


It is most probably the problem with blend door or blend door actuator. But just in case I would suggest to follow the entire procedure:

First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

Oct 17, 2009 | 1998 Ford Taurus

2 Answers

Heater valve


there is no heater control valve in this truck, heat control is done through what are called blend doors. So the issue may be the front blend door motor has failed, this is very common on all Ford heatimng systems except the Focus.

Dec 15, 2008 | 2000 Ford Expedition

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