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OT:6.2L Diesel hot, then cold up and down

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redtom

02-24-2008 18:37:35

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My faithful 83 6.2 Chevy with 270,000 miles is fluctuating temp. After years of running the same temp it started going from "normal" to 200 plus then back down...This started when it was really cold out, single digit cold. I know the t-stat is supposed to open and close but it never moved like that before. Happens going down the road I don't think it does it idling. I replaced the stat but only a 195 was available and I had put in a 180 about 1990. Now it does the same only a little hotter. I suspect a failing head gasket but its not using a lot of water. I looked in rad but don't see any amout of bubbles while running, a little foamy, but not oil foam. Other engines I've seen with leaking head gaskets would heat up real quick wether idling or going down the road. One guy at work says he's seen impellers on small car water pumps corroded right away.

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jdemaris

02-25-2008 06:01:29

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Re: OT:6.2L Diesel hot, then cold up and down in reply to redtom, 02-24-2008 18:37:35

It's not uncommon for a 6.2 with over 200K miles. When a head gasket goes in a 6.2, it tends to go slowly, and get gradually worse and worse - unlike the Oldsmobile 5.7 diesels that crapped out much faster.

When a 6.2 first starts to go, you'll see swings on the temp gauge, from periods of normal, to periods of hot - back and forth. The heater will do strange things and sometimes blow cold air.
The overflow cannister will keep getting over full, and you can often feel the top radiator get overpressurized.

Nothing that new head bolts and gaskets won't usually fix - if you haven't cracked the heads yet. 6.2s that get driven a lot with a bad head gasket tend to crack heads - especially if it's a C-code engine in a 1/2 ton truck. They have big valves with very little metal between them.
The new replacement heads - made for 6.5s - are much heavier, but cost $200 apiece.

You can often buy an entire engine with less than 100K for less than the price of a set of head gaskets and bolts - but that's the way it goes.

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Kentb of SWMO

02-25-2008 05:40:23

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Re: OT:6.2L Diesel hot, then cold up and down in reply to redtom, 02-24-2008 18:37:35

Worked on a Kodiak with a 427 on LP with the same problem. you have a bad connection some where as GM gauges when disconnected from the sender go to max reading.

Kent

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Jerry Coulter

02-25-2008 04:38:59

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Re: OT:6.2L Diesel hot, then cold up and down in reply to redtom, 02-24-2008 18:37:35

I would suspect something wrong with the heat gauge. Borrow or buy one of those non-contact thermometers and check the engine at a high and at a low.

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