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Old 07-11-2018, 12:10 PM
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boulder4x4 boulder4x4 is offline
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Why does my 04 discovery cool down (176) when I slow down and get warmer when there is a load on the engine... yes there is air in the heater core and I have done the in-line thermostat mod. the engine stays cool and does not get above 204 but that is still too high for me.


so....


what is the best way to get the air out of the heater core and why does it cool down on the slow down.
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Old 07-11-2018, 12:31 PM
proper4wd proper4wd is offline
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you're special.
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Old 07-11-2018, 12:32 PM
Howski Howski is online now
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Swap the heater core lines if you’ve tried conventional methods. I typically run without the cap off for a long trip and it usually works the air out. If there are any ‘small’ air pockets left they usually work themselves out in a day or two (with cap on)
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Old 07-11-2018, 12:43 PM
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you're special.

you're specialier
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Old 07-15-2018, 01:06 PM
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for about 60 bucks you can buy a kit that will pull a vacuum on the cooling system and then fill it up with out any air bubbles. I fought burping it the regular way many times and then finally broke down and bought the tool. Well worth it.
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Old 07-15-2018, 03:05 PM
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for about 60 bucks you can buy a kit that will pull a vacuum on the cooling system and then fill it up with out any air bubbles. I fought burping it the regular way many times and then finally broke down and bought the tool. Well worth it.

Which one did you buy?
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Old 07-16-2018, 11:11 AM
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This has been helpful for eliminating trapped air.

http://a.co/amxiasX

Funnel Bucket



You get better temps at lower RPMs because you're not circulating aerated coolant and you're generating less heat.
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Old 07-16-2018, 11:28 AM
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I have this one but I couldn't pull as much vacuum as I needed for the disco. it would hold the vacuum but not pull any more.






https://vergedeal.com/products/auto-...and-refill-kit
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Old 07-16-2018, 01:26 PM
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Quote:
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Which one did you buy?
https://vergedeal.com/products/auto-...and-refill-kit
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Old 07-17-2018, 07:23 PM
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I would assume your fan clutch isn't doing its job. If you can coast down a hill with no load and the temps drop can only assume your clutch is not grabbing well when you are working the engine.
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Old 07-18-2018, 11:45 AM
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that's true... but it does have the consistency of peanut butter when you spin it. I finally got the air out. but I cant really leave well enough alone. now I have air in it again.
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Old 07-20-2018, 10:08 AM
proper4wd proper4wd is offline
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let's re visit this. you are surprised that your engine generates more heat when under load?

204 is perfectly acceptable and about 20 degrees cooler than they typically run with all factory parts. youre chasing a ghost.
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Old 07-20-2018, 05:47 PM
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Quote:
Originally Posted by proper4wd View Post
let's re visit this. you are surprised that your engine generates more heat when under load?

204 is perfectly acceptable and about 20 degrees cooler than they typically run with all factory parts. youre chasing a ghost.
I agree. Unless you're running a 180 thermostat temps north of 200 degrees is normal.
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