New twist on overheating - Defender Source
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  #1  
Old June 23rd, 2006, 10:34 AM
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New twist on overheating

94 D-90 was running warm, not overheating.

Checked overflow and it was full. Went to order new radiator and RN was out. Checked radiator itself and it was 2 quarts low on coolant.

Topped up, now runs normal temp.

Humm . . . bad radiator cap? Head gasket?

How do I test the cap to see if it holds pressure?
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  #2  
Old June 23rd, 2006, 01:06 PM
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Had you flushed or otherwise drained the cooling system recently? It might have been burping out some air in the system as it cycled from hot to cold a few times. I've found I have to fill it at all 3 spots in a certain order, otherwise it leaves a lot of air in the system that takes forever to burp out if you just fill from the overflow can.

-Hans
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Old June 23rd, 2006, 01:08 PM
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I had not checked level in almost a year other than the overflow.

What order, I see only the two fills unless you are counting the overflow.

I think it ran a bit out throught the overflow drain thing because I smelled coolant, but I have not checked level again as the truck was hot and that was just yesterday I did all this.
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Old June 23rd, 2006, 01:21 PM
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I'm counting the overflow. I normally fill at the radiator, then the upper fill, then the oveflow, while squeezing the upper hose to work the air out.

That much coolant in a year may signify a small leak somewhere, but I wouldn't start thinking head gasket just yet. That much air in the system can cause a pressure build in the system that can start blowing out through the radiator cap. I'd start looking around though for fresh coolant around the water pump, hose joints, and also look for strange misting on the inside of the windshield if you have the defroster on.

If you use the stainless strap style clamps, and the hoses are getting old, it may be time for new ones if the ends are crushed under the clamps.

-Hans
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  #5  
Old June 23rd, 2006, 01:33 PM
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For checking the pressure of the cap, I take off the radiator to resevoir hose at the radiator and use my bike pump that has a pressure cap on it to check. You can also take your air compressor (I can't believe some people don't have one...) and set the hose regulator close to the pressure of the cap and stick the blower in the end of the hose leading to the resevoir. Total time to check is under 5 minutes and it is one of the first things (other than fluid level) that I check if I am overheating.
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Old June 26th, 2006, 05:53 PM
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For pre-97 V8 90s and 110s remove the heater line fill plug and the radiator fill plug. Remove the cap on the expansion tank. Then fill the radiator until it burps fluid out the heater fill. Then put the plugs in both and top up the expansion tank, then install the cap. No bubbles that way, as per factory instructions.
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Old June 14th, 2009, 12:59 PM
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Quote:
Originally Posted by ECR
For pre-97 V8 90s and 110s remove the heater line fill plug and the radiator fill plug. Remove the cap on the expansion tank. Then fill the radiator until it burps fluid out the heater fill. Then put the plugs in both and top up the expansion tank, then install the cap. No bubbles that way, as per factory instructions.

Ive tried this with no luck.
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