Hi, I have already had this repaired once by Landrover. I am now again watching my thermostat move all the way to the RED when I am idling at a stop light, etc. When I turn the car off after a long drive, it sounds like it is going to blow up, very loud. Sounds like it is trying to cool down. If I am not sitting idle my needle stays in the middle where it should be which tells me that my cooling fan is not coming on when it should be. Any thoughts?
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HI run engine until heat gauge reaches half or 90degrees .then feel top and bottom radiator hose for equal temperature ,IF not thermostat faulty. once you have replaced thermostat and coolant with required water dilution run engine by 90/100degrees engine cooling fan should switch on/off automatically .IF this happens system is fine.
I have seen a few problems with the cooling fan on Land Rovers. Usually the relay portion of the fan fails. For a while Land Rover had fans on back-order because so many where failing. I would recommend having the fan/relay checked. FYI the relay module and the fan are usually one assembly.
It sounds like there is a leak of some sort. (hose, freeze plug, water pump, blown head gasket, etc.) The coolantlevel is probably low. You need to check it ASAP! Check the coolant level and if it is low you need to find out why and get it repaired...You DON'T want to overheat that engine! Especially if you have the 3.0L V-6. It only has to overheat once to do some serious engine damage.
At idling speed an engine does build up a lot of heat and the cooling fan will kick in. In slow moving traffic or traffic jams the temperature gauge can touch the red - particularly on hot days. The reason it cools down when you start moving is because of the air flow through the radiator.
Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.
If the fan is running all the time as you drive, this points to either a fault in the fan switch, or the car is running too hot. presumably in normal driving the fan isn't running and the temperature gauge reads normal?
It is common - in stationary traffic many cars overheat (particularly big engined models) try to stall and 'cut out'. Restarting can be difficult until the engine cools down.
Is your car overheating in normal driving conditions or just at idle speed? Overheating in normal driving conditions can be caused by things like a failing water pump, blocked radiator, collapsed hose, faulty thermostat or, in the worst case scenario, cylinder head problems.
Overheating at idling speed is 'common'. Check your coolant level. If your car isn't using/losing coolant then there probably is no major problem. You can flush out the cooling system and refill with new coolant - and also check your radiator. Are the cooling fins crumbling with age? Or maybe they're partly clogged with insects and debris from the road? A blast with a hosepipe wil sort that out ..
The question is how much does your car overheat in normal driving? If it doesn't .. it appears as though you have nothing to worry about as such. Most cars have 2 speed fans... the 2nd faster stage kicks in at some point dependant on engine temperature. Perfectly normal.
It sounds like a cooling fan problem. You state the temp runs high when at a stop and idling, but goes down once you start moving. If the fan(s) are not operating, moving forces air through radiator keeping the temp at a normal range. Have the relay/fuse for the cooling fan(s) checked. They are located under the hood in the main fuse/relay box. If they are good, check the sensor that sends the signal to the fan(s). If it is good, then it could be a bad motor on the fan(s).
if you mean "thermostat" valve .. then that can fail either open or closed . if it fails open then the engine will not reach normal operating temperatures .. if it fails closed then yes the engine will overheat .. another common failure is the radiator fan .. it only runs when the car is not moving .. as long as the car is moving then cooling air is available so the fan is not needed ... so if your car does not overheat when driven but overheats when stopped or idling then suspect the radiator fan or thermal switch (mounted on the radiator) .. that switch turns on the fan when the radiator gets so hot ... you can just listen for the fan when hot .. you should hear it .. .. if your car gets too hot while driving then suspect a bad thermostat or clogged radiator .. sometimes a bad water pump (broken implellers) will cause the trouble ..
the cooling fan should come on about 105-107C and shut off about 95-97C
does the car overheat just sitting running not moving
but if the car overheats on the highway then it's not the fan
check the fan operation run the car till the gauge is over half and watch the fan
if the fan woks then check coolant level if that's ok then try a thermostat
It sounds like it may be your electric cooling fan. When the car is sitting idling does the fan behind the radiator ever come on? If not then this is your problem. Your car doesn't overheat when it moving because you're passing air through the radiator with the movement of the car. The problem could be the fan itself, the fan relay, or a temperature sensor.
Sounds like either you are low on coolant or the cooling fan isn't working. With engine cool remove radiator cap and check coolant level, top off if necessary. If full start engine and turn on A/C full blast, full cold the cooling fan should come on almost instantly, unless there are two individual cooling fans in which case only one may turn on. If no fans turn on check all fuses whether related to fan or not. If all fuses fine try swapping relays around, they are usually all the same size/style. If fan still doen't work you have either an open positve or ground side of the circuit, Which will require wiring schematics and a multimeter. If coolant full and fan/s turn on and engine still overheats you'll need a new thermostat installed.
There are a host of issues that can cause a vehicle to overheat. Getting from what damage has been done to what caused the damage will be tricky. Here is what I would do in you position.
Repair issues as found.
1) Check the fans, you should have 2 coloing fans, one for the a/c and one for the cooling system.
Make sure that neither are frozen and that both turn freely without growling sounds.
*Growling, noisy, frozen motors will need to be replaced.
2) Refill the radiator with fluid, (just use water right now no use wasting money on antifreeze until the problem is resolved), check for leaks.
*Repair all leaks found.
3) Start the engine Hold your hand pressing lightly where the radiator cap goes, if you are building pressure there within say a minute or so then you have combustion entering the cooling system.
*If pressure is building then internal damage has been caused and will need to be addressed by a competant mechanic/shop.
4) Keep the coolant reservoir full as the temperature rises to normal operating temperature. Listen and watch for the fan motor to start at the temperature rises. Turn the A/C off during this process, don't mistake the A/c fan for the cooling fan.
*If fan does not come on then you will need to check voltage to the fan motor to see if there is a problem with the fan or the electrical system to the fan such as fuses, relays senders or wiring.
**If fan is operating then probable cause is a sticking/stuck thermostat.
Once problems have been found and resolved drain and refilll cooling system with a 50/50 solution water/antifreeze.
Also replace the radiator cap unless you have the ability to pressure test the one you have already.