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12-14-2025, 16:08

spongebob started a thread anti freeze question..,,, in Duramax 6600

I dropped the bottom radiator hose, let it drain, blew wind in the tank, removed the bolt in the thermostat housing..then replaced bottom hose and...

13 replies | 107 view(s)

12-14-2025, 15:05

The Munz started a thread Severe Blow-by w/only 104K miles! in 6.5L Turbo Diesel - Tech Support - Troubleshooting - Performance

I sold my '94 K2500. Current: 1993 C3500 6.5 Auto 4x4 1-ton SRW 104K miles. Obvious oil drips/seepage on chassis & turbo area. Have put nearly 2K...

7 replies | 74 view(s)

Yesterday, 05:08

Robyn replied to a thread 6.5L Turbo Diesel Blazer Project in 6.5L Turbo Diesel - Tech Support - Troubleshooting - Performance

Working on the gates, barn doors, or anything on the back end of these rigs is not usually pleasant.... I had to do some work on the two piece...

256 replies | 324431 view(s)

12-17-2025, 18:15

spongebob replied to a thread anti freeze question..,,, in Duramax 6600

O'tay...

13 replies | 107 view(s)

12-17-2025, 14:43

DmaxMaverick replied to a thread anti freeze question..,,, in Duramax 6600

Zero F, or thereabouts, is GM/Dexcool's weakest recommended concentration, at about 33%. 50% is the industry standard recommendation for any...

13 replies | 107 view(s)

12-17-2025, 14:27

More Power replied to a thread anti freeze question..,,, in Duramax 6600

The two Duramax engines I've replaced head gaskets on both took 6 gallons to refill the cooling system.

13 replies | 107 view(s)

12-17-2025, 14:21

More Power replied to a thread 6.5L Turbo Diesel Blazer Project in 6.5L Turbo Diesel - Tech Support - Troubleshooting - Performance

Sarah and I ordered a new front bumper for the Blazer - a painted/primed bumper, with holes for the license plate bracket and the diesel cooling...

256 replies | 324431 view(s)

12-17-2025, 08:09

spongebob replied to a thread anti freeze question..,,, in Duramax 6600

Heres my deal, right now I have 4 qts of 50-50 and 2 qts of water, giving me a 0* protection.

13 replies | 107 view(s)

12-16-2025, 13:46

More Power replied to a thread Duramax Head Gasket Replacement in Duramax 6600

Slowly moving forward! I recently bought this Harbor Freight diesel compression tester for about $100. Aside from simply a bad injector, an out...

163 replies | 233250 view(s)

12-16-2025, 09:34

DmaxMaverick replied to a thread anti freeze question..,,, in Duramax 6600

Your temperature range is within normal, although it may seem less smooth than with the previous OEM stats. If it's no more than that, and you don't...

13 replies | 107 view(s)

12-15-2025, 16:32

spongebob replied to a thread anti freeze question..,,, in Duramax 6600

the only temp issue Im having is my temp gauge now fluctuates, when the truck was new it ran one mark under the 210* line, now it fluctuates between...

13 replies | 107 view(s)

12-15-2025, 15:41

DmaxMaverick replied to a thread anti freeze question..,,, in Duramax 6600

Are you having heat issues? Have you completed the purge procedure? What's the reason to replace NAPA stats? A normal drain/fill service doesn't...

13 replies | 107 view(s)

12-15-2025, 12:30

The Munz replied to a thread Severe Blow-by w/only 104K miles! in 6.5L Turbo Diesel - Tech Support - Troubleshooting - Performance

Update: Have yet to attempt any remedies, however, I just started engine and observed puffs of smoke out of filler tube. Definitely blow-by coming...

7 replies | 74 view(s)

12-15-2025, 10:57

spongebob replied to a thread anti freeze question..,,, in Duramax 6600

so the low point isnt the bottom radiator hose then....thanks GM....every video/ thread Ive seen guys just let it rip out of the bottom hose... Ive...

13 replies | 107 view(s)

12-15-2025, 10:34

DmaxMaverick replied to a thread anti freeze question..,,, in Duramax 6600

The engine and remainder of the system will retain a lot of coolant. The bottom of the block will also retain a lot of coolant. It has drain plugs...

13 replies | 107 view(s)

12-15-2025, 10:30

The Munz replied to a thread Severe Blow-by w/only 104K miles! in 6.5L Turbo Diesel - Tech Support - Troubleshooting - Performance

OK. Thanks again. I'll try the MMO.

7 replies | 74 view(s)