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Old 09-16-2012, 03:21 PM   #1
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Bob King's Avatar
Alpine Owners Club
Join Date: Feb 2006
Location: Ojai, California
Posts: 165
Coolant Compatibilty

Being new to diesel engines, maybe I'm just being to cautious. I have a 2004 36FDDS with a 2003 ISL 400 Cummins engine. The manual calls for TMC RS 329 or 330 coolant, either ethylene or propylene glycol. The coolant in the system is green, which I think is ethylene glycol. The coolant I bought today confirms to the TMC RP 229 spec., but is red in color. My question is, are they compatible? Another question, how often should the SCA be checked? The local parts house wouldn't sell me the test strips because he said they were way out of date and they couldn't back their reliability, so that means a 40 mile round trip to get some.
for being so long winded.

'04 Alpine 36 FDDS
Bob, Ojai, CA
K6OHI - Monitor 146.52
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Old 09-16-2012, 03:26 PM   #2
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Location: Auburn, CA, Havasu, AZ & Mulege, BCS
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You could check SCA's every 6 months or so. IIWMI'd use the drain petcock, let it run a bit then test. You'll only lose maybe a pint of fluid doing this.

As long as the basic chemistry of the coolant is the same, color is just a marketing tool of the coolant mfgr.
Baja-tested '08 2-slide 36'
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