Microlighters

my 200 hr service done, coolant changed, now water temp about 5-10deg higher (70-75deg) than before the change(65-70deg) . I used castrol's anti freeze / coolant (red) the temp also rises to 80-85deg while flying with a pax.

How can i check if the temp sensor is giving me the right reading?

To me the simplist would be

1. Get a normal termometer from the chemist and boil some water. Check the temp water boils at at you altitude.

Than take the sensor out, dip it into boiling water and see if it gives you the same reading.

Alternatively, you get a multimeter from Makro/Game etc made by Major. They are the ones with the yellow rubber covering. They now have temperature testing built in and they have a green probe for testing the temp. I use it to calibrate the iron for covering the aircraft. works very well.

Your sensor is not reading head temp but rather water temp, so run up the temps, check your guage. Then safely open the radiator cap, be very careful and measure the water temperature with the multimeter

Slow Poke.....what ratio did you mix the coolant and the water?
You should NOT mix more than 10% - 15% coolant with DISTILLED water. If you mix at 50% the temps could read higher.

aviation engines sugested a 50/50 mixture?

I agree with Duck, recently redid my whole coolant at 50/50 same as manual suggests it overheated while on ground and now I've got damages , engine was fine before then again it was 34C. and only on for about 5-10mins

A comment from another pilot was 100% coolant, Ja right or 100% tap water

What To Do, What To Do - maybe sell 582 and go back to 503 - lots and lots less hassles! No seriously guys, i used 50% castrol summer formula (redcoolant), silica free ect ect ect with 50% distiled water. what i did notice on the particular day
was that the:

1-density-altitude was quite high and QNH was 1012
2-low barometric pressure (820mb)
3-humid as hell as it rained prior to take off
and last but not least 30 deg ambient temp.

could tyhis be the problem?

CHT was also bit higher but EGT only slightly higher than normal. They did not exceed the max temp at all.

I think i still want to check the temp sender as well just for interest
sake.

I wantet to do a test flight this morning early but wind was already pumping@ 05h00am

100% sorted out - used a mixture of 30% coolant and 70% distiled water.

Hmmmmmmm........ so this means I don't have to prove that a 50/50 mixture is not correct.......damn! And I was looking forward to some long-winded technical "bullshit-baffles-brains" posting. Maybe just as well, 'cos the last time some clown named George Something-Or-The-Other accused me of "nonsense blabber" on his first and only posting thus far.

Glad you're sorted.

Duck Rogers wrote:George Something-Or-The-Other accused me of "nonsense blabber" on his first and only posting thus far.

Yep, "Ol' Straight-Talking" George.

One post and gone ....

Maybe the best.

Quacker-Mate, when are you coming to Durbs [end-January 'tis near]

Regards
John ZU-CIB

Hi Fliers!
IMHO too much focus is placed on coolant temps below boiling.
Higher coolant temps = higher heat transfer.
If you are not losing coolant, why worry?
Be sure to leave enough air in the system for expansion, was surprised to have to explain this to a triker filling up after every flight and needlessly worrying about it, his instructor was evidently ill-informed.
Ran my old 532 with the small radiators lean and hot (90deg plus) all its 600 hours before retiring it when the coils started failing. (Mostly used Quicksilver TCWIII oil, but lets not start that thread yet again!)
FlySafe!
Abe.