6,2 liter diesel suburban Overheating and dont know why

Hi I have recently purchased a 83 Chevey suburban 4x4 with a 6.2 liter

disel engine.Since it was my first Diesel
I took it to my mechanic who looked it over replaced a temporary drain
plug in the engine block that the previous owner had installed (it was
leaking all over the place ) but other wise pronounced it worth the
1000 bux the guy was asking
I replaced the fuel filters and changed the oil and started to drive
it. About two weeks ago Iwas driving back home from a gig about 2:30 in

the morning and noticed the truck was over heating .I was about a mile
and a half from home so I turned the heater on to try to bump the temp
down a little ..no heat .Yikes
Got home and sure enuff discoverd that yet another drain plug in the
block (drivers side) had popped out. Cussin my bad luck I Dropped off
the truck at the shop expecting to hear I had cracked the block or
something equally bad . But to my suprise after a new plug was
installed and coolant refilled it started right up with dry exhaust .
Feeling like perhaps I had missed the bullet I took the truck out for a

test drive watching my gauges for any sign of trouble . Thats when it
got weird.The truck started to over heat .. then fixed itself this was

not repeated that day but the next day it did it again. I figured I had

lost the thermostat so replaced it ..same symptoms but worse,also
noticed that when truck over heated got no hot air from the heater and
when it would temporarily fix itself got hot air . ran it with out a
thermostat as a way of checking the waterpump and worked fine except
engine was ice cold of course tried another thermostat same symptoms .

If anybody has any Ideas would Appreciate the help

Sounds like you have air in the system.

[email protected] wrote:
> Hi I have recently purchased a 83 Chevey suburban 4x4 with a 6.2 liter
>
> disel engine.Since it was my first Diesel
> I took it to my mechanic who looked it over replaced a temporary drain
> plug in the engine block that the previous owner had installed (it was
> leaking all over the place ) but other wise pronounced it worth the
> 1000 bux the guy was asking
> I replaced the fuel filters and changed the oil and started to drive
> it. About two weeks ago Iwas driving back home from a gig about 2:30 in
>
> the morning and noticed the truck was over heating .I was about a mile
> and a half from home so I turned the heater on to try to bump the temp
> down a little ..no heat .Yikes
> Got home and sure enuff discoverd that yet another drain plug in the
> block (drivers side) had popped out. Cussin my bad luck I Dropped off
> the truck at the shop expecting to hear I had cracked the block or
> something equally bad . But to my suprise after a new plug was
> installed and coolant refilled it started right up with dry exhaust .
> Feeling like perhaps I had missed the bullet I took the truck out for a
>
> test drive watching my gauges for any sign of trouble . Thats when it
> got weird.The truck started to over heat .. then fixed itself this was
>
> not repeated that day but the next day it did it again. I figured I had
>
> lost the thermostat so replaced it ..same symptoms but worse,also
> noticed that when truck over heated got no hot air from the heater and
> when it would temporarily fix itself got hot air . ran it with out a
> thermostat as a way of checking the waterpump and worked fine except
> engine was ice cold of course tried another thermostat same symptoms .
>
> If anybody has any Ideas would Appreciate the help
>

On 8 May 2005 10:50:38 -0700, [email protected] wrote:

>Hi I have recently purchased a 83 Chevey suburban 4x4 with a 6.2 liter
>
>engine was ice cold of course tried another thermostat same symptoms .
>
>If anybody has any Ideas would Appreciate the help



Sounds exactly like you have not bleed all the air from the system.
Caution: fix this before driving, it can result in damage to the
engine.

There should be a bleed on the thermostat housing, and one or two more
elsewhere.

If you bleed all the air, and you find that it 'comes back' you may
hav a leaking head gasket.

thanks will look into t and let you know what I find