Question about 1998 Land Rover Discovery

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95/98 2.5 tdi discovery

Hi what is the best way to blled the cooling system on my disco? PLease help me the seems to be no more bubbles in the system but i have lost the hot air so i am led to believe that it needs further bleeding. Any help on this problem would be gratefully recieved. best regards kenny

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With the engine running open plug on thermostat to bleed system, on the same time pour water into water reservoir for the radiator to keep the water level.

Posted on Oct 23, 2008

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2 Answers

Engine temp gauge reading hot, no leaks in system. Heater does not work most of the time. only blows cold air.


Hi!!
Make sure there is no blockage in front of radiator or condenser coil. It seems like the cooling fan clutch may be quitting. When the fan clutch is working properly, if you turn the fan with your hand when the engine is cold, it should turn freely, if you do it after driving the vehicle when the engine is HOT, the fan would be pretty stiff and should not turn free at all. By the year of the vehicle, I believe that's where the problem is.
Good Luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa!!

Apr 02, 2011 | 1987 Toyota Pickup

1 Answer

The thermostat went all the way to the red zone, telling me the car was extremely over heated. The heater was not blowing hot air, there is plenty of coolant and it wasn't hot, the oil wasn't hot, but...


It's possible that you have air in the system. In these cases, a hot air bubble can form near the temperature sensor, and the bubble can also prevent coolant flow to the heater. Recommend you park on an incline, open the radiator cap, if you have one, start the car and let it warm up. Open any blled ports you can find on the cooling system to let any air out. Fill the radiator to the top, if possible--do not fill the reservoir to the top if that is the only place you can add coolant.
Note, if air bubbles continue to come up in the radiator or reservoir after the car is hot and coolant is flowing, you may have a blown head gasket. Let me know if you have any questions.

Dec 13, 2010 | 2003 Volkswagen Passat

2 Answers

Overheating


I would recommend that you bleed all air out of the cooling system. The bleeder valve is located on top of the engine. Once engine starts to overheat or when you can hear bubbling back into the overflow bottle, turn car off and open bleeder valve. If you see bubbling you have air in your system. Bleed the system a couple of times and see if this helps.A heat sensor sending unit which controls activation of the electric fan could also have failed.But is the heat sensor is properly working then check the radiator cap is it properly fitted or got loose.If its loose it will release the pressure and car will overheat.But if the radiator cap is properly closed.Then its time to check the HEAD GASKET.As you have mostly replaced all the possible faults for overheating and if other mentioned possibilities are checked OK.Then its time to check and replace head gasket. Thanks. you can rate this solution and show your appreciation.

May 19, 2010 | 2004 Land Rover Discovery

1 Answer

I have a 1994 Dodge Ram that keeps overheating.


have you replaced the thermostat , checked for leaks , etc. ? If so, when adding coolant did you bleed the system ? The system has to be bled of air bubbles . Almost all cars have a bleeding screw right at the thermostat housing. It is a regular screwdriver screw. you must bleed the cooling system after adding coolant . If you can't find a bleeding screw, get some thick gloves so you won't burn your hands . Turn the radiator cap until you hear air hiss out. Let it bleed until only coolant wants to come out into the reservoir. The car must be running to operating temperature when you blled the system.

Dec 29, 2009 | 1994 Dodge Ram

2 Answers

Nissan Altima running hot


When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!

Nov 03, 2009 | 1998 Nissan Altima

3 Answers

My car is running hot then cool, it seems to run hot when I use the heater and run cool when I use the AC, is this a problem with the thermostat?


When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BEKIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat2_bing.gif open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may bepartially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do ahydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!

Oct 19, 2009 | 2002 Mazda 626

2 Answers

94 Volvo 850 turbo still running hot


Do the air purge test below.

The fins/turbine on water pump can be totally worn out.

====

When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!


Sep 15, 2009 | 1986 Volvo 740

1 Answer

*96 Chevy Tahoe


Hello,
After your exhaustive tasks I feel one of two things are left to rule out.
First, have you an air lock? did you bleed the cooling system after installation of parts? if not try parking on level ground, with engine cold not running remove coolant filler cap and top up if required to correct level.
Start the vehicle and leave to idle with cap off, have plenty of hot water available, when at operating temperature you may here gurgling and see bubbles in the cooling system Beware not to get too close as it will hopefully boil over, after it does top up with warm water and wait, keep blower on full and heat to max inside vehicle.
It may boil/bubble over a few times before settling if so top up and replace cap once settled.
Finally if an abundant amount of air bubbles are continually visible and regular bubbling over then unfortunately the cylinder head or gasket could be at fault.
I hope this points you in the correct area.
Please remember to politely rate this possible remedy!
Onyer~EDson(:0) {#><U.K.

Jan 21, 2009 | 1997 Chevrolet Tahoe

1 Answer

I have changed the rad and the thermostate and the temp cooling sensor and it still runs hot tell me why please


You have a bubble in the cooling system that is blocking the thermostat from opening. Alleviating it is simple. Now that you've changed everything, just jack the car up so that the thermostat's opening is facing slightly upward. Start the vehicle and let it idle until it's about 3/4 of the way to hot. This is how you'll know the bubbles are trapped behind the thermostat and keeping it from opening (you want it facing upward so that the bubbles will stay behind the thermostat and not move off away from it). Once you reach 3/4 hot, shut off the car and go have a beer while it cools off. Once it cools enough to safely open the radiator cap, open it up and the release of pressure will allow the thermostat to open. The bubbles will come through the thermostat and "burp" out of the radiator (which you may or may not see, but it will happen). You may see the level of coolant drop somewhat, since the air bubbles were taking up space in the cooling system. Top off your coolant both in the radiator and the overflow reservoir if yours has a fill cap, put the cap back on the radiator, and you are good to go. With the bubbles burped out, your thermostat will be able to open and close as needed and the cooling system will operate as it should.

Sep 16, 2008 | Dodge Grand Caravan Cars & Trucks

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