RockyGryphon
Member
- Joined
- Dec 27, 2013
- Posts
- 36
- Reaction score
- 0
- Location
- Wyoming
- First Name
- Jonathan
- Truck Year
- 1985
- Truck Model
- K10
- Engine Size
- 6.2L Diesel
I'm guessing my flush knocked something loose and now its trapped in the radiator. Probably didn't help that I used some stop leak when a small hole opened up. Was your radiator replaced with an aluminum one by any chance?
I don't know what kind or how many cores it has, but I asked the mechanic to try to have it repaired before just replacing it and he said they attempted to but it kept falling apart. I know the left tank seam had separated from the frame which I repaired with steel epoxy and it survived about 900 miles, but after sitting for four years, it started leaking again when I started it back up. Nice thing about diesels, I don't think the fuel goes bad as easily as gas does. Though of course you can stabilize anything I suppose with the right stuff like Sta-Bil or whatever it's called. Supposedly you can even restore bad fuel with some solutions.
From a 6.2 manual I found on the internet:
"
GM 1825 M Spec. coolant is used in the 6.2L Diesel. It is a new specification with modified fomulations to lessen aluminum transport deposition (cavitation erosion). When engines with aluminum components are used with coolants not formuIated for aluminum, plugging of radiators and engine overheating has been observed. Aluminum cornpounds in the radiator tubes caused the plugging.
Both servlce and owners manuals call for GM 1825 M Spec. Coolant. The new coolant (1052753) conforms to GM 1825 M.
"
Dunno if this means to use orange or green coolant.
It's possible if you ever had hard water or there was some factory chemical in the coolant areas, they flaked off and came loose and may have blocked something. I suppose the other things that could cause overheating are:
Thermostat bad
Radiator fan clutch bad (quite possible after many years)
Water pump (if you have severe heat problems)
Belt!!!!!
Temperature sensor (not likely, double check with a ten dollar infra red thermometer from Harbor Freight or wherever).
Hose leak (if you're going to remove the coolant, good time to change the hoses).
gasket leaking exhaust into the coolant (I doubt it, but there's a chemical check for this to test your coolant for it).
Emergency brake on (yes seriously possible, feel sluggish?).
dirty old oil and filter?
Transmission fluid level low or dirty?
I don't know what else to guess at except what you said about some blockage. You could flush alternating directions to see if that clears it.
I would definitely recommend distilled water to mix with your coolant and not adding any leak chemicals unless you really want to.