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Old 10-14-2012, 03:21 PM
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coolant presssure question???

just finished 900 mile round trip with a new edge insight and coolant pressure gauge hooked up. deltas were 8-13 degrees traveling between 65 and 80 mph, gonna need a new oil cooler soon, coolant pressure stayed right about 6-7 lbs pressure. only problem happened when pulling a 10% grade over mountain pass at 9000 ft. coolant pressure jumped to 14-15 lbs, no puking or whistling from degas bottle, ECT jumped to 220 and EOT jumped to 227 degrees. by the time i hit the bottom of the pass all was normal again???? any ideas? thanks
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Old 10-14-2012, 03:26 PM
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Did the fan kick in?
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Old 10-14-2012, 03:34 PM
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yes it did.......... but you could barely here it. i stopped at the top to check under the hood and fan was running.
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Old 10-14-2012, 05:37 PM
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The fan always runs when the engine is running the fan is spinning, that said it doesn't mean that the clutch is fully engaged.
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Old 10-15-2012, 01:51 AM
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I wouldn't worry about the coolant pressures - they are normal with the temps you saw. The temps are on the high side though (I am surprised the fan did not come on at a higher speed), but if you have only seen this on a steep grade when towing, it probably is OK.
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Old 10-15-2012, 08:59 AM
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When I say normal again, ECT was 190* and EOT was 200-203*, gonna need new oil cooler? What is the cause of the increased coolant system pressure, had I not backed off the acc pedal it looked like coolant pressure would have kept going up while pulling the 10% grade. other than that the pressure remained right at 6-7 lbs for hours on end crusing between 65 - 80mph through serious rollong hills........ very little flat land aroung here
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Old 10-15-2012, 09:50 AM
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When the coolant heats up, it expands. When it expands, the vapor space in the degas bottle gets smaller (compressed) and the pressure increases. The smaller vapor space you start out with, the more compression there is with the liquid expansion. That is why the cold level in the degas bottle is important.

10-13 degree difference bewteen coolant and oil is not a huge problem. Just keep an eye on it.

Last edited by bismic; 10-15-2012 at 09:53 AM.
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Old 10-15-2012, 10:36 AM
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bismic, thanks for the response... i understand the science behind the expansion, just wondering about the mechanics behind it, is there something not functioning properly? i initially thought oh SH## my head gaskets are blown. trying very hard to not have to tear down the entire top and and replace those darn things................
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Old 10-15-2012, 11:28 AM
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Sorry for the science part - just don't "know what you know". Personally, I think you are fine. I assume that your coolant level is about 1/2" below the minimum mark when you are cold? Also assume it is a 50/50 mix (or slightly higher)? I will say that I haven't seen the peak pressures you did, but then again I don't see the grades that you do. Bottom line, Ford set their specs where they are for a reason (ie the cold fill mark, the 221 deg F ECT to defuel the engine, where to initiate the cooling fan on high speed, etc). You were working your engine pretty hard and you didn't puke. That's a good thing.

If you have some restriction in the coolant flow to the EGR cooler (which you might have some, but if so, it isn't enough to worry about yet), then there is a possibility that there is some flash boiling going on in the EGR cooler. This can add some back pressure. Also, keep an eye on the EGT's (if you have a gauge). Sometimes stuck turbo vanes can elevate the EGTs.

Last edited by bismic; 10-15-2012 at 11:33 AM.
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Old 10-15-2012, 12:10 PM
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Again I'm with you on this Mark. Op you said you were pulling a 10% grade your temps were fine especially pulling a load on that grade. Your temps are only a concern when doing around 65 on flat ground under minimal engine load and not pullingtang form of payload for around 10 miles. Meaning if your around 15-20* under those conditions than you need to get ready for an oil cooler rebuild.
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