94 D-90 overheating!! - Defender Source
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  #1  
Old June 29th, 2012, 06:44 PM
Mowabb2
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Garrett
1994 Land Rover Defender 90
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94 D-90 overheating!!

I have recently had problems with my D-90 overheating. I got a new water pump and hoses, a new thermostat, got the radiator rodded out, and still don't know what is wrong. I have been told that the fan clutch might be the issue but i also was told that if I get the radiator fixed, I wouldn't need a new fan clutch because the radiator is big enough to cool off the engine alone. I have no idea what to do now, so if you have had a similar problem, please let me know because I would really like to keep this car! If I can't get it to cool down, I might have to get rid of it... It only gets hot when I am going up a hill or sometimes on the freeway... I don't know if that is normal or if that is really bad...
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  #2  
Old June 29th, 2012, 06:52 PM
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Chris
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Sensor defective?
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  #3  
Old June 29th, 2012, 07:21 PM
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Mike
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Get a new fan clutch.
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  #4  
Old June 29th, 2012, 07:22 PM
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Leif
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If it's happening at speed (freeway) and not at idle then it might not be the fan clutch, but you should test that with the rolled up newspaper to stop the fan from spinning once the engine is warm. If you can stop it, it's worn out and not engaging.

Sounds like you have opened up the cooling system a few times. Make sure all the air is out. It took me a few weeks to burp the last bubble out of my system after I had the radiator worked on. It was running a little hot, but only at low speeds and at idle.
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  #5  
Old June 29th, 2012, 07:25 PM
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Jason England
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Quote:
Originally Posted by Rocky
Sensor defective?
If it rises and falls under load then it's not the sensor.

First check the system pressurized and is full. The hoses should be firm after you've been running and should hold pressure for a while. Check the expansion bottle cap seals properly ... I've seen faulty ones.

Fan clutch is probably a good place to start once you've done this. Don't think a heavy duty is better than standard ... It will just make more noise and suck gas! ( ask me how I know! )

Make sure the system is well burped to get all the air out ... It's harder than you would imagine ...

Pressure test the system ... You can rent a pressure tester from autozone for free .. That will help locate any leaks.

Make sure that the radiator doesn't have any cold spots after running for a while ... You may have had it rodded .. But I don't trust anything I haven't validated myself.

A D1 fan clutch and an RRC 11 blade fan can beef up your cooling power a bit ...

If after all this you still have an issue then it's probably head gasket related ... I'm just about to do mine ...
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  #6  
Old June 29th, 2012, 07:32 PM
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Mike
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I know this is obvious, but be sure it's topped off.
Do you have a temp gun? If so, check the temp difference between the upper and lower hoses.

Any leaks? Have you checked for exhaust gases in the coolant?

Cheers...
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  #7  
Old June 29th, 2012, 07:41 PM
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Make sure the system is well burped to get all the air out ... It's harder than you would imagine ...



I am on this soap box all the way. The coolant system needs to be put under vacume and then filled and it takes a special tool. I have overheated and had to resleve my 3.9 just because I did not have the system fully filled.
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  #8  
Old June 29th, 2012, 07:47 PM
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Jason England
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Quote:
Originally Posted by Mowabb2
I have recently had problems with my D-90 overheating. I got a new water pump and hoses, a new thermostat, got the radiator rodded out, and still don't know what is wrong. I have been told that the fan clutch might be the issue but i also was told that if I get the radiator fixed, I wouldn't need a new fan clutch because the radiator is big enough to cool off the engine alone. I have no idea what to do now, so if you have had a similar problem, please let me know because I would really like to keep this car! If I can't get it to cool down, I might have to get rid of it... It only gets hot when I am going up a hill or sometimes on the freeway... I don't know if that is normal or if that is really bad...
Is it the freeway when in traffic or when you are moving?
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #9  
Old June 30th, 2012, 09:23 PM
ajh
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Andrew J. Hutton
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Also; fitting a proper aftermarket (VDO Vision are good and inexpensive and easy to install) temperature sensor and gauge that reads in actual degrees is something that really should be done on every vehicle. Especially considering the 'signal conditioner' that ECR points out on thier site.
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  #10  
Old July 1st, 2012, 03:15 AM
Mowabb2
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Garrett
1994 Land Rover Defender 90
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I think that the car just overheats when I go up the hill, I posted the original message after the first time I drove it after the radiator got fixed. I realized that it has actually gotten a little bit better but I will for sure try to burp the system out. Thanks for all the input and keep adding if you know more!
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  #11  
Old July 2nd, 2012, 12:22 PM
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Check the head gaskets.
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  #12  
Old July 2nd, 2012, 01:24 PM
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John Crouse
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unfortunately x2 on the head gaskets. That's how mine started.
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