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- Newsgroups: rec.autos.tech
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!uwm.edu!linac!att!cbnewse!cbnewsd!bohdan
- From: bohdan@cbnewsd.cb.att.com (bohdan.l.bodnar)
- Subject: Re: TESTING of antifreeze chemical balances?
- Organization: AT&T
- Date: Tue, 10 Nov 1992 14:51:22 GMT
- Message-ID: <1992Nov10.145122.8905@cbnewsd.cb.att.com>
- References: <1992Nov7.191310.1@sscvx1.ssc.gov>
- Lines: 37
-
- In article <1992Nov7.191310.1@sscvx1.ssc.gov> schludermann@sscvx1.ssc.gov writes:
- > What are the paramters to test in ethylene gycol antifreeze? Like Ph what
- >should it be? and other chemical balances. I've use the same anti freeze in
- >my 88 toyota pu for 130k. I periodically pull the radiator cap off look for
- >crud, stick my finger in there and feel for junk. It's clean. I replaced the
- >water pump at 95k beacuse of a bearing failure and there was no signs of
- >pitting or that white flower stuff. I top off the resevoir with those
- >"extend" products about once a year and add a little distilled water. The hoses
- >are original too and I saturate them a few times a year with silicone, I use
- >up one spray can each time. I know this goes agianst common wisdom, but
- >who sets the rules? The chemical companies.
- >
- >Kris
- >
- >
-
- These are the tests I use: 1). specific gravity 2). EMF generation.
-
- The specific gravity can be tested with a hydrometer (I use a REALLY cheap
- one); I set my mixture so that the freezing protection is roughly -25F. If
- you really want to be exotic, use a refractometer to check the specific gravity
- (you'll get the same results as with a good hydrometer). The second test is
- based on a SAE publication from 1980 (it's in a book whose title is something
- like COOLANT TESTING: STATE OF THE ART). You'll need a digital voltmeter (or
- a high impedance analog meter accurate around the 500 mV range). One probe is
- grounded and the other one is inserted into the radiator's filler cap. If the
- read voltage (ignore polarity) is less than 300 mV, the corrosion protection is
- good (on my cars, I read 100 mV). 300 mV to 500 mV is marginal, and above 500
- mV the coolant should be replaced immediately. The book also covers corrosion
- electrochemistry, corrosion protections, and a prototype corrosion sensor
- which, for some reason, never made it into the market. My recollection is that
- scientists at GM developed this test and this sensor.
-
- Hope this helps.
-
- Bohdan Bodnar
-
-