Question about 1999 Ford Expedition

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99 expedition not enough water pressure to circulate water???

Water isn't circulating unless it's running and then it won't circulate to heater core to get heat

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  • Ford Master
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Sounds like your water pump is not doing it's job or your thermostat is not fully opening,here's a link to replace both.Here's the thermostat link.

Posted on Dec 02, 2012

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Posted on Jan 02, 2017

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motor1258
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SOURCE: My father and I have

Sure there isn't a control valve inline to heater core?

Posted on Dec 12, 2008

michigan man
  • 3533 Answers

SOURCE: 99 expedition heater valve

yes to the first question
and yes it is the blend doors
recommend get another unit for the control or take that control out and see if one of the tubes is broken off the control unit

Posted on Dec 31, 2008

  • 1 Answer

SOURCE: 99 ford expedition front heater core location

I have a coolant leak inside my expedition and it is coming through the vents does this mean that it is the heater coil

Posted on Jan 29, 2009

  • 1114 Answers

SOURCE: heater not heating hot enough. heater core not

Good place to start is a cooling system flush and thermostat replaced.

Posted on Dec 28, 2009

  • 1206 Answers

SOURCE: There isnt coolant going through

yes very common you will have to flush it out using a garden hose with good water pressure. disconnect both hoses connect one to the hose and turn the water on keep switching to back flush it until clean water runs out of it. reconnect hoses and it will be fine.

Posted on Nov 15, 2010

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1 Answer

Coolant isn't circulating in the engine of a Jeep 2002 Grand Cherokee V8. Radiator was just replaced as well as the water pump and thermostat.


Hi Jonny, While the engine is cold the thermostat will be closed, allowing coolant circulation around the engine block and cylinder head but not through the radiator. Only when the engine has reached normal operating temperature will circulation be noted in the radiator. A good test is to remove the thermostat while the engine is cold , start the engine with the radiator pressure cap removed and observe flow. If as I suspect it is there, refit the thermostat and check the heat gauge. If all remains well there is no problem. If the engine overheats replace another thermostat. If there is no circulation with the thermostat removed, there is a blockage in the cooling galleries of the engine. If chemical flushing does not clear it, it will require disassembly of the engine with careful step by step inspection at every stage. If the cylinder head(s) had been removed I would suggest making sure of the galleries not being blocked by installing the gaskets incorrectly. Regards John

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I have a dual zone heating system that has 2 Taco 007-F5 cartridge circulator pumps. Both thermostats are calling for heat, however the pump that feeds upstairs is running and getting hot, but the hot...


CHECK IF THE PUMP COUPLING IS THERE IF SO TRY BLEEDING THE RADIATORS UP STAIRS TO SEE IF U GET COLD OR HOT WATER N IF THE WATER IS DIRTY. THEY LINES MIGHT HAVE AIR IN THEM. IF U TRIED THESE N STILL NOT GETTING HOT U WILL NEED TO CHANGE THE MOTOR N COUPLING

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How to fix a vapor lock in the radiator on 99 mercury couger


Run the motor until it's a little bit warmed up. Put a big rag around your hand and remove the radiator cap while the engine in idling. Don't take the cap off completely all at once. Just loosen it first. After the steam and a small amount of coolant escape,

remove the cap completely and slowly pour water into the radiator and let the vapor circulate out. Don't get burnt. The rag around the hand is of utmost importance to avoid steam burns.

If the radiator won't take more water, there's a drain **** on the bottom of the radiator. Open it with a pliers if need be. They're usually too tight for just finger strength.

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The vehicle is idling all this time. Now, remove the radiator cap as described above, slowly add water (about one liter per three minutes, so you don't crack the engine block) and let the gas circulate out.

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2001 lincoln ls v6 engine overheats when air condition is on?


replace your thermostat and check the waterpump. The ac "pulls" heat out of the air in the car thereby making it cooler, at the expense of making your coolant heat up even quicker than normal. Try this to see what's going on.. Open the radiator cap, start the engine and wait until the car gets up to operating temperature. You should be able to see the water circulating through the radiator...if the fan comes on, and the water isn't moving, then replace the thermostat. If it still isn't moving after that, the water pump may be no good. Id bet on the thermostat. They're cheap and need to be replaced every so often. If the water is circulating and the fan never turns on, then you check the fan motor, relay, etc. There is also a temperature sensor located somewhere next to the thermostat. It's rare to have to replace that, but if it's faulty, then the fan won't turn on and thus overheating occurs. I am assuming here that if you drove your car up a hill without the ac on, it will overheat or get hotter than normal...So....go test your circulation first and let me know what you find. Oh yeah, when you do the circulation test, turn your heater in the car on full blast too...does it get hot inside the car?

Jul 06, 2012 | 2001 Lincoln LS

1 Answer

Should the engine be running when adding coolant to my 2003 cadillac cts


If you just drained it & are refilling,then yes,the engine
should run & warm up until the thermostat opens & you
keep adding.

If it isn't hot & circulating thru the entire system, you won't
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Jun 10, 2012 | 2003 Cadillac CTS

1 Answer

My heater is not getting hot


Hello! There are only a few reasons for this awful event to occur in early December...Either Hot water isn't circulating through the heater core, the thermostat isn't opening or the door that directs heat is faulty...Is the temperature gauge showing normal? Next, is the upper radiator hose hot and hard? If the last two answers are yes then hot water is circulating...The unit that controls the doors ...ie...heat or defrost is called an Actuator...Also the lever that opens the heater may be at fault....LETS ELIMINATE...
Is there defroster heat? If no the heater core isn't opening ..If yes then the actuator is the culprit...You can check the heater by feeling of each of the two hoses that come through the firewall into the inside...If they are both hot then the heater core is open and functioning...If one is cold the heater isn't being opened by the temperature control..Or it is simply blocked with gunk....It's a 99 and getting old...I would suspect that IF the upper radiator hose is hot and hard and the temperature gauge is normal all is well with with most components and the next step is; Are both heater hoses hot...Your going to have to narrow this down for me to pinpoint the cause...See diagram below of the door actuator allowing defrost heat to be sent to the heater floor duct...
Send a comment with results and or observations...Remember"your my eyes and my hands"...Guru ...Saailer



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Dec 02, 2011 | 1999 Dodge Durango

1 Answer

My carkeeps overheating all the sensors were checked and they are okay. The fan pump is working fine and the thermostat and water pump are new. Water does not appear to circulate?


Hi, well most likely this is the water pump? This is the commonest thing if the water isn't circulating. The pump will have to be replaced.

Jul 04, 2011 | 2002 Lincoln LS

3 Answers

I keep overheating changed out thermostat and fan and still overheating I fill the hose with coolant and it all goes into the overfill tank and gets hot and boils out


A clogged radiator could be your problem. Flushing won't necessarily clean out a clogged radiator.
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