Coolant Test

[squeefoo]

This has been posted by Q45 tech before, but I thought it bore repeating since new coolant is so important. ... and since just about everyone has a DVM you don't have to run out and buy the strips or go by mileage.Quote »Coolant Contamination

We all know that neglected coolant can lead to a clogged cooling system and a loss of cooling system efficiency, but it can also cause other less obvious problems.

The buildup of coolant scale and deposits can coat or corrode the exposed surfaces of engine temperature sensors, affecting their accuracy. Inaccurate sensors may send incorrect information to the computer, and temperature controlled vacuum or electrical switches may fail to function properly. Any of these may cause driveabiltiy problems.

If the coolant's age or condition can't be easily determined, there is a quick check for coolant contamination using a Digital Volt-Ohm Meter (DVOM). Attach the positive DVOM lead to the radiator, then dip the negative lead into the coolant at the filler neck.

A voltage reading of 0.2 volts or less is very good. A reading of 0.5 volts should be considered borderline and anything over 0.7 volts is unacceptable. If the coolant fails this test, the cooling system should be thoroughly flushed and cleaned. Remove any engine temperature sensors and inspect them for contamination or other damage. Repair as necessary. [/quote]

[elwesso]

Thanks for posting Dr. Squeefoo...

now if there were only an easy way to determine freezing point.

[qship96]

Thanks for posting Dr. Squeefoo...

now if there were only an easy way to determine freezing point.

why not just get a 3.99 prestone coolant tester that tells you the freeze/boilover temp based on your concentration of coolant?

[Q45tech]

Unfortunately boiling/freezing temperatures have little to do with the Ph+ of the mixture. Reserve alkalinity [numbers above Ph 7.000].

The measurement problem goes away if you flush and replace every 3 years or 30-40k].

[squeefoo]

Unfortunately boiling/freezing temperatures have little to do with the Ph+ of the mixture. Reserve alkalinity [numbers above Ph 7.000].

The measurement problem goes away if you flush and replace every 3 years or 30-40k].

Yeah Wes.... what he said.... you have to mix it righ in the first place, then test it before you put it in.