Question about 2005 Ford F-150

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02 F150 4.6 I have no heat only cold air

The Rad is full, temp gauge indicated engine at proper operating temp, coolant looks clean, thermostat is new,

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  • glgruzd Dec 29, 2008

    Is there "easy" access to the blend door? With out taking apart the dash?

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Check the blend door near pass side behind glove box

Posted on Dec 27, 2008

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Confirm an operational thermostat and heat control valve.

Posted on Dec 27, 2008

  • Peter Fadoulakis
    Peter Fadoulakis Dec 29, 2008

    Unfortunately no. A good portion of the dash (all of it in some cases) must be taken apart to access the blend doors.

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2 Answers

I have a 02 Grand caravan that has new radiator, termostat, one new fan. the temp gauge goes up to max hot the drops right back down in seconds. what could be the problem?


it could be you have an air lock in the cooling system
remove the rad cap from the rad, start the engine and let it run until the coolant drops (add to fill it back up) or until the coolant boils out of the rad spout.

maybe pull the heat sensor. -replace it OR clean it off, reinstall it.

Mar 12, 2015 | 2002 Dodge Grand Caravan

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It only gets hot when going speeds faster than 65 or 70 mph for 5 min or so. I can push in the clutch and coast and the temp gauge will start to climb rapidly let out on the clutch and cool back down. I...


Hi

Your engine thermostat is stuck open and this is what is causing the problem. You will need to have a new thermostat fitted - Usual cost is between $15 to $30. Maybe less depending on thermostat type.

How the thermostat works is it remains in a closed position within the engines coolant circulating system to allow the engine to heat and reach its optimum operating temperature. The thermostat then opens to allow the coolant to circulate freely. When the thermostat becomes faulty it fails to respond to the temperature of the coolant. What has happened it that it has opened and is stuck in an open position allowing the water to circulate too freely around the engine - you will see a brief rise in temperature when the engine is worked hard but as soon as you come to rest the temperature falls back again as the thermostat is not closing when it should.

Solution - replace thermostat and all will be well!

Hope this helps. Please remember to rate my answer. Many Thanks.

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I've been having overheating issues with my 95 f150 132k miles 5.0 automatic 4x4.I started replacing the coolant system components (burping until no bubbles for every part)with no improvement every...


Remove the thermostat temporarily just for a diagnostic strategy. Put the thermostat housing back on with a new gasket and then drive it for a time to confirm that it is no longer doing that same thing. You will be running too cool to leave the thermostat out and you will have little or no heat. I just want to know if removing the stat helps before I continue. let me know.

Dec 08, 2014 | Cars & Trucks

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1987 jeep Cherokee temp gauge moves when car starts then goes. Back to 0. I replaced temp sending unit what now


ever consider it's telling the truth, (an IR pyro gun (tool) answers that in 1sec flat.
if it is truthing ,then that means the thermostat is missing,
or stuck open or it has one of those abominations, a failsafe Stat.
or air pockets below the stat causing it to go nuts, and the coolant sender too, goes double nuts, because of stat and because the coolant sender don't work in AIR. see? FULL IS KING> is it.

of when dead cold is the Rad FULL>????? cap off?
if not, BINGO>?
then does the rad hose get fully hot with a hot engine.
hand touches top rad tube and hand flies off, bam, 180F+
that be hot. is it?
(look ma, no tools?)

if the coolant is at 180f , rad full
and the gauge reads wrong, it might be a bad gauge or wires to it.
but that 180f thing is #1 , is it?

Sep 10, 2014 | 1987 Jeep Cherokee

2 Answers

My 2001 ford Taurus heating temp gauge is not constant on dashboard. It goes up and down. I don?t have heat. Water pump, thermostat, in and out pipe and coolant are changed. Still no heat.


Start the engine when cool, remove rad cap and start engine and let it run with the heater on. (not defrost) Top up coolant as needed in rad, and let it run until either the rad fan comes on and off 2 or 3 times, or you can see increased flow in rad from thermostat opening. It will obviously happen after it reaches operating temperature, so watch after gauge gets close to there. Wait until you see that flow 2 or 3 times or fan comes on and off before you put cap on, and fill return bottle to proper level as well. That should cure it, by getting air out of system, and coolant flowing through heater core.

Dec 24, 2009 | 2001 Ford Taurus

2 Answers

Changed thermostat and added coolant but 1997


could be waterpump?
i was going to say rad fan,but if so heater would be hot.
lack of coolant will make heater core to blow cold,if engine heats up with full coolant,usually means poor or no circulation.
water pump?
run engine with full coolant,at operating temp.with rad cap off and look in rad cap hole and see if there is movement of water inside rad.
[rad fan will not come on if water is not circulating through rad water pump?]

Dec 20, 2009 | 1997 Chrysler Cirrus

2 Answers

Engine and hood extremly hot new thermostat installed and temp gauge working properly why so hot?


Make sure you're using proper amount of coolant in the water. You could have dirty fins or something blocking the front of the rad preventing it from cooling enough or might be rad clogging up. If gauge goes over half way then I'd worry. I'd remove rad and use rad cleaner or get it cleaned professionally.

Jul 01, 2009 | 1998 Jeep Cherokee

1 Answer

I have 97 dodge caravan 3.0 and i put in a brand new radiator and thermostat.Now the cooling fans dont come on and fluid is bubbling up and coming out of the reservoir. But if I unplug the temp. sensor...


Not unusual to get big airlock if heater (not defrost) isn't on during bleeding process. I usually start vehicle, top up rad 1 " or so from top,turn heater on , then watch temperature gauge & wait for fan to come on after I see flow through rad indicating thermostat opened.(Normal operating temperature)I let it do that about 3 times before I put rad cap back on, after topping rad up to about an inch or 2 from top. Then fill coolant return bottle, to proper level. It may be your problem, but if your temperature gauge goes way up past normal operating temperature, before you see flow in rad, then maybe a faulty thermostat is the cause.

Jun 11, 2009 | 1997 Dodge Caravan

2 Answers

99 couger 2.5L 6 Cyl-temp gauge maxing out, overheating


I will normally remove rad cap when cool. Start engine, set heater in car to heat & turn on blower, if you use defrost setting, the rad fan &/or AC fan will come on, and you don't want that. Then while running with cap off, make sure coolant in rad is an inch or 2 from top of rad, and let it run. When engine gets to normal operating temperature on the gauge, you'll start to see more flow in radiator, and rad fan should come on shortly after, to cool the incoming hot liquid in the rad, that tells you the thermostat opened as it should, and the process starts again, engine coolant gets to temp, thermostat opens, hot goes to top of rad for cooling, and cooler liquid goes out the bottom to engine, etc etc. If your heater is not on while doing this, the coolant doesn't get to heater core in most cases, thus creates an airlock, or will cause level in rad to go down when it is turned on, and thus reduces amount of coolant in rad, plus airlocks in the entire system. So, let it run to the point that the rad fan comes on & off on it's own, about 3 times, while you watch the gauge, to make sure it doesn't overheat, if it does, shut it off and let it cool down & try again. if all appears good, top rad up if needed to an inch or so from top, put your cap on properly, add coolant to proper level in return bottle & try it and see what happens. Remember though, I am assuming thermostat was put in correctly, rad in good shape, fan is working properly as well as water pump doing it's job. If this method doesn't work, get back to me with results.

Feb 16, 2009 | 1999 Mercury Cougar

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