Question about 1999 Ford Expedition

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1999 FORD expedtion with no heat in front nor back. Good water flow and the hoses are not very hot. The heat will be hot for about 5 to7 seconds and then get cold again. what do you think?

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What is the engine temperature? It may be that the thermostat is stuck open and the engine is running cold.It may also be sometheing stuck in one of the lines that moves to block it when the flow starts.

Posted on Nov 07, 2010


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Heater blowing cold air. I have checked coolant, flushed heater core and replaced actuator. still blowing cold air. Where do I go from here

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The two lines are 1. the hot water coming from your radiator and 2 the return water coming out of the heater core going back to the radiator. If the hose is hot which it should be and the return is less hot which it should be, it sounds like you have an issue with the temp controls part inside the vehicle. It is electronic I think so that is more than likely your problem.

Mar 03, 2016 | 1999 Ford Expedition

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Both hoses are hot, heater core not clogged, blend doors work fine (already check via cutting in the assembly for repair), blower works fine, luke warm heat coming out 1999 jeep grand cherokee laredo

ok, its just a heat exchanger.
all that matters for heat is:
1: the engine must reach 180F + and hold, does it.???
we use the scan tool , is ECT reading that, good.!

or hand IR pyro gun,,, pointed at the thermostat housing
then pointed at both heater hoses.... what do they read.

2: the hot water must flow through the core, must.

3: air must flow through said core. (damper or dirt blocking core)

gotta be...

back flush the core? yet? see it flow good?

Sep 01, 2015 | Jeep Cars & Trucks

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How can i troubleshoot my heater core

It's just a simple small radiator. Coolant circulates through it, and the cores' fins give off heat that is picked up by the blower motor.
When the engine is at normal operating temperature, feel the two heater hoses. Both should be hot, verifying coolant is circulating through it. If only one is hot, the core may be plugged or have an air block. You can take off the core outlet hose and observe stream flow when engine is running and heater on high heat-flow should be slow but steady. The outlet hose will run from the firewall to the front of the engine into a fitting near the water pump. Some cars have a water valve in one of the hoses-make sure it is open, for coolant to circulate.

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Getting no heat in 2001 ford taurus. Changed thermostat 3 times over a period of time. Flushed radiator plus had the heater core back flushed twice. After the 1st back flush, we had heat for a mile. temp...

If both heater hoses are getting hot, the problem could be a stuck blend door under the dash.
If only one hose is getting hot, there is a blockage in the coolant flow somewhere.

Jan 15, 2013 | 2001 Ford Taurus

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I have a 99 ford expedition with heating problems. It will heat in the middle section for about 15 seconds then you can feel it go to cold air. We have changed the blend door actuator, thermostat, and...

Check if there is a vacumn powered valve in the heater hoses, if there is the vacumn hose may be faulty [ broken or crimped.] or the valve is faulty. good luck.

Jan 03, 2011 | 1999 Ford Expedition

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Here we go again I have a 1999 ford expedtion with a heating problem I have heat for about a min or two and then gets cold both of the hoses on the heater core r hot changed the tgermastat the radiator...

three possibles, the control unit on the dash is not moving the blend door, the blend door motor is not working, the plastic blend door inside the same housing that the heater core is in, is broken.

Dec 13, 2010 | 1999 Ford Expedition

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No heat in cab in ford ranger 2005 tied heater

check if both heater hoses going into firewall are hot.. if only one is hot then your heater core is stopped can take both lines loose and take a water hose and back flush,,, force hose on one inlet of heater core for a minute and then the other.. keep going to you get a good flow...make sure heater valve is open, not just valve position take loose and confirm clear..last make sure your thermostat is not stuck open keeping engine from comming up to temperature

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No heat,hot water is going in the heater core,good

it is the blend door actuator. lol i just did one today since here in Houston we had a little cold snap and everyone is realizing that their heater isn't working. The blend door actuator is on the bottom of the heater case and has one plug with 4 or 5 wires. It requires a 5.5mm socket to remove 3 screws and just pull down to release it. Hope this helps.

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No water to heater heat . replaced thermostat , but no waterflow to heater coil,

6or8? Some of those have a lot of **** in the system. If it has a water valve in the heater lines, make sure it is operating properly. Check to be sure the hoses are hot going in and out of the firewall. This should be checked just as the thermostat opens. You can tell by checking the top hose to the radiator. When if gets hot all at once, check the heater hoses. If one is still not as hot as the other there is no flow. This could be the water valve, if equipped, a restricted core(which you may be able to backflush if careful), or in worst case situations..a blown headgasket will put air in the system and not allow the heatercore to get fluid. Good luck. TJ

Oct 18, 2009 | 1999 Ford F150 Regular Cab

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