Message

----- Original Message -----

Sent: Tuesday, January 06, 2004 = 5:50=20 PM

Subject: [FlyRotary] evap core = air=20 pockets?

Greetings,

In thinking = about my evap=20 core installation, I realized that there would be a potential problem = with air=20 getting trapped in the top of the cores. Since the hoses are all = on the=20 bottom, it just seems like there's always going to be some air trapped = at the=20 top, unless I find some way to bleed it out. =

Ed, I just = looked at your=20 pics again, and don't see any provision to remove air from the top of = your=20 cores. Is this not really a problem?

Thanks,

Rusty (really = leaving=20 now)

Well, yes and=20 no. You are correct when initially filling after a drain, you = will find=20 that approx 1/4 -1/3 of the upper core is filled with air. A = peacock=20 would of course release the air, but I never installed = any. =20 However, I have a proceedure that works and since I don't drain the = coolant=20 but once a year (intentionally that is), here is the proceedure I=20 use.

Fill = up the system=20 with as much coolant as it will hold (this will leave air trapped as I = mentioned - but not to dispare) - fire up the engine and let = idle with=20 the radiator cap off. Let it run for 1 to =20 1 1/2 minutes, then shut it down. You will find that = the=20 system will now take more coolant. Do this a couple or three = times never=20 running it for over tw0 minutes at a time and refilling the system = each=20 time.

Then = put the=20 radiator cap on and fire up the engine again. This time run it = up to max=20 rpm for apporx 30 seconds and then shut it down. You should find = your=20 header tank again low on coolant. A couple of more runs up to = max static=20 held for not more than 30 seconds and refilling will remove the air in = the=20 cores.

First time you run=20 it up and after shutting it down hold your hand on the side tank of a=20 core. You can tell where the coolant level it very easily. = It will=20 be much cooler immediately above the water level in the core and much=20 warmer/hotter where the coolant is in the core. So you can monitor = your=20 progress in removing air by feeling the side tank for the temp = differential=20 line.

Note: DO NOT PLACE=20 RELIANCE ON YOUR COOLANT TEMP SENSOR while doing this. It will = not=20 register the correct temperature unless it is in steady contact with = the=20 coolant which it won't be until you get most of the air out. So = don't=20 be lulled into letting the engine run longer than I suggested = just=20 because the temperature gage says everything is OK. =

Hope = this=20 helps.

Ed=20 Anderson