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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 11-29-2019, 03:27 AM   #1 (permalink)
Bavaria_Truck
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radiator antifreeze

hello,
a question which radiator antifreeze is right for my Chevy 6.5TD, 1994.

Many thanks

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Old 11-29-2019, 08:00 PM   #2 (permalink)
Tommygunner
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In a 94 its safest to use the older glycol base green colored coolant. GM started using the newer Dexcool pink/orange coolant in 1996.
Never mix different type/ color coolants. Always add the same type/ color.

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If Americans ever allow banks to control their currency. First by deflation then inflation. The banks will deprive the people of all property. Until their children wake up homeless.
1998 GMC K1500 WT, 6.5 TD. 80,000 miles. Auto, 3.73 gears. Remote PMD mounted on the radiator support. KOJO tune WOW! Carter HD lift pump. Feed the beast, GM8 turbo with Hurricane impeller. K&N filter. Ported, gasket matched upper intake. Leroy's braded stainless steel oil lines.
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Old 11-29-2019, 08:57 PM   #3 (permalink)
Monka
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I just use plain ol green, never any issues
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Old 11-30-2019, 12:49 PM   #4 (permalink)
ak diesel drive
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I've used both with no issues. I think the biggest thing is to use distilled water in it
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Old 11-30-2019, 08:08 PM   #5 (permalink)
Sirleitet
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Don't use coolant based only on it's color.
You need to check the anti-freeze if it's silica free. Silica damages o-rings & rubber alike.
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Old 12-01-2019, 07:01 AM   #6 (permalink)
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Quote:
Originally Posted by Tommygunner View Post
Never mix different type/ color coolants. Always add the same type/ color.
VERY important
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Old 12-01-2019, 01:06 PM   #7 (permalink)
Tommygunner
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Quote:
Originally Posted by Sirleitet View Post
Don't use coolant based only on it's color.
You need to check the anti-freeze if it's silica free. Silica damages o-rings & rubber alike.
That is not exactly true. OAT coolants like Dex Cool are silica free but you should never mix OAT based coolants with older (green, yellow) Glycol coolants. A chemical reaction will occur resulting in the glycol turning to gell and clogging up the cooling system. Never mix OAT (Usually Pink, orange, red) coolants with Glycol base coolants no matter what the silica content.
OAT coolants can also damage gaskets and seals on older engines not designed for it.
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The beauty of the Second Amendment is that it will not be needed until they try to take it

If Americans ever allow banks to control their currency. First by deflation then inflation. The banks will deprive the people of all property. Until their children wake up homeless.
1998 GMC K1500 WT, 6.5 TD. 80,000 miles. Auto, 3.73 gears. Remote PMD mounted on the radiator support. KOJO tune WOW! Carter HD lift pump. Feed the beast, GM8 turbo with Hurricane impeller. K&N filter. Ported, gasket matched upper intake. Leroy's braded stainless steel oil lines.
New Bosch injectors. Flow matched 2200 lbs pop
3 1/2" custom Aero turbine exhaust. Nutered Cat
2" Lift RS5000 Shocks. 285 X 17 Bridgestone AT summer tires. 12.50 x 33 x 15 Procomp MTs winter. Powertrax No slip locker in rear.

Last edited by Tommygunner; 12-01-2019 at 01:08 PM.
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Old 12-04-2019, 08:14 PM   #8 (permalink)
lukeenterprises
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You will need to use GM part number: 3634621 after putting in new antifreeze. This is the coolant system seal tabs. You will put all six tabs in your radiator. This helps to seal the head gaskets and any minor leaks. Many mechanics do not know about these seal tabs.

I have seen many heads taken off when all the car needed was seal tabs. The Cadillac Northstar was probably the worst.
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Old 12-04-2019, 08:41 PM   #9 (permalink)
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Quote:
Originally Posted by lukeenterprises View Post
You will need to use GM part number: 3634621 after putting in new antifreeze. This is the coolant system seal tabs. You will put all six tabs in your radiator. This helps to seal the head gaskets and any minor leaks. Many mechanics do not know about these seal tabs.

I have seen many heads taken off when all the car needed was seal tabs. The Cadillac Northstar was probably the worst.
Is that an updated part number?
The part number we have listed in the Parts List section of the FAQ shows:
Coolant System Seal Tabs:
GM: 10953473
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Old 12-04-2019, 09:10 PM   #10 (permalink)
lukeenterprises
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Quote:
Originally Posted by OkDually View Post
Is that an updated part number?
The part number we have listed in the Parts List section of the FAQ shows:
Coolant System Seal Tabs:
GM: 10953473
I guess my number is updated. The numbers have changed through the years. My number works on Amazon. You just need to use 60 grams of whichever number. This one takes 6. There is another number for 4 cylinder engines (12378254) and it takes 15.


Last edited by OkDually; 12-04-2019 at 09:43 PM. Reason: repaired quote
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