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#37465 - 07/26/01 10:36 AM Dex-cool anti-freeze tester
Red98C5 Offline
Junior Member

Registered: 07/20/01
Posts: 21
Can you use the same type anti freeze tester for Dex-cool as the old glycol based stuff? The type I mean is the one where you have the "bulb" on the top to suck the fluid in and expell it, and have the "floating" dial inside that raises with the freeze temp. I don't care about the litness strips or the like, only the bulb style. Also has anybody had their Dex-cool changed and seen operating temperature increases? This seems to be the thing I am seeing now.

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#37466 - 07/26/01 12:04 PM Re: Dex-cool anti-freeze tester
Pewter C5 Offline
Member

Registered: 07/18/01
Posts: 26
Loc: Washington
I believe the Dex-cool is still an Ethylene Glycol based anitfreeze, so the tester you speak of should work OK. If in doubt, just mix up a small 50/50 mix in a jar and test it to see if the tester indicates the correct freezing point for a 50/50 mix.

There's only one thing I could think of that would cause the temps to increase after changing the cooling system fluid -- trapped air in the system. Guess it's also possible that the thermostat happened to start failing by coincedence.

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#37467 - 07/26/01 12:12 PM Re: Dex-cool anti-freeze tester
Buzzer Offline
C5Forum Fanatic

Registered: 12/05/00
Posts: 2194
Loc: Virginia
When you changed your antifreeze did you follow the engine warm up procedure?? If not you could have hot spots. Not too good in an aluminum engine. eek

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#37468 - 07/26/01 08:13 PM Re: Dex-cool anti-freeze tester
c4c5specialist Offline
Member

Registered: 07/10/01
Posts: 1612
Loc: conn
Hi there,
A few things that should be considered here.
First, yes, you can use your bulb type tester, with accuracy, and no problems.
Second, you will find that the ideal 50/50 mix, if changed, can at times, cause a temperature change, here is why.
As we all know, antifreeze is thicker than regular water, so it does not flow as easily as water. Therefore, convection of heat is not as efficient, so if you have a higher concentration of antifreeze, you may not cool as well.
Remember that 5050 is the best compromise between corrosion protection, and cooling of the engine.
Just a few thoughts, c4c5 laugh barbiehasmyhammer
_________________________
c4c5 Chevrolet dealership mechanic, ASE Master Technician w/L1. COFFEE ADDICT. A persons judgement is only as good as the information they have, which should be FACT, not fiction.


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#37469 - 07/26/01 08:58 PM Re: Dex-cool anti-freeze tester
Buzzer Offline
C5Forum Fanatic

Registered: 12/05/00
Posts: 2194
Loc: Virginia
Antifreeze concentrations higher then 60% are not only too thick for proper flow rates but it also does not transfer heat as effectively either.

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