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#4456554 - 07/11/17 06:50 PM 1999 4.3 Intake gaskets and coolant flush
nwjones18 Offline


Registered: 11/30/09
Posts: 1052
Loc: Warner Robins, GA
Just picked up a new project. 1999 S10 4.3 with only 50k miles. Intake manifold gaskets are shot and oil is leaking out the back of the intake and is in the oil (I'd guess a qt or two of water in the oil). The previous owner changed the WP right before it started leaking and was just tired of messing with it. I'm assuming the dexcool was never changed and he said the heat wasn't working great so I assume heater core is stopped up as well. I'm planning on changing the oil a few times quickly to clear out the milkshake; is that all I need to do? Also the radiator looks pretty rough through the cap but doesn't appear to be leaking should I just go ahead and replace it preventatively, or run a flush though it?
_________________________
1988 F-150. 4.9 I6 247k. 10w-40 Castrol Syn-blend ACDelco UPF2.
2005 Cadillac STS N* 108k. 5w-30 Castrol Magnatec ACDelco Classic PF61

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#4456584 - 07/11/17 07:22 PM Re: 1999 4.3 Intake gaskets and coolant flush [Re: nwjones18]
pair of Blazers Offline


Registered: 09/10/05
Posts: 352
Loc: Empire State
had the same thing w/01 Blazer plus the poppet valve problem.
If your going to open it up check to see if the "spider" was changed to the new style one.
thread from this board
https://bobistheoilguy.com/forums/ubbthreads.php/topics/1115158/Re:_01_ChevyBlazer_6100_mi_on_#Post1115158
thread on it from another board
http://s-seriesforum.com/forum/showthread.php?t=79763
good luck.
_________________________
91 4dr 4wd hot rod - 01 2dr 4wd sold - 14 KIA Sportage
12 KIA Forte work - 16 Honda CRV Mom's - 14 Honda CRV G/F
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#4456736 - 07/11/17 09:01 PM Re: 1999 4.3 Intake gaskets and coolant flush [Re: nwjones18]
barkingspider Offline


Registered: 12/22/13
Posts: 2051
Loc: socal
I had this happen on an 02 S10. After replacing the intake manifold gaskets and valve cover gaskets, I recommend replacing the radiator, heater core, all coolant hoses, coolant overflow tank, and water pump. Then change the oil, drive for a day, change oil again, then do short oci until u are satisfied all coolant is gone from the crankcase. This is what I did, truck ran normal, had good AC and heat, zero leaks
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#4456743 - 07/11/17 09:06 PM Re: 1999 4.3 Intake gaskets and coolant flush [Re: nwjones18]
dlundblad Offline


Registered: 09/30/13
Posts: 10058
Loc: Indiana
I just took the intake off my '97 today this evening. I was leaking coolant around the entire thing, but it wasn't near as bad as yours. I've had it since March and added coolant the day I brought it home and have put about 6k on it.

When you buy the gaskets, buy the upgraded Fel Pro 98002. The kit came with gaskets for the injector setup, plenum and valve covers too.

I'm personally thinking about giving the Mercedes citric acid flush a try. I found an online source for $17 shipped.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4457391 - 07/12/17 03:37 PM Re: 1999 4.3 Intake gaskets and coolant flush [Re: barkingspider]
nwjones18 Offline


Registered: 11/30/09
Posts: 1052
Loc: Warner Robins, GA
Originally Posted By: barkingspider
I had this happen on an 02 S10. After replacing the intake manifold gaskets and valve cover gaskets, I recommend replacing the radiator, heater core, all coolant hoses, coolant overflow tank, and water pump. Then change the oil, drive for a day, change oil again, then do short oci until u are satisfied all coolant is gone from the crankcase. This is what I did, truck ran normal, had good AC and heat, zero leaks


I like your style, but there is no way I'm messing with that heater core if I can flush it out and it doesn't leak.. What a pain in the butt. I can get a radiator off ebay/amazon for $50 so I may just go ahead and do that.
_________________________
1988 F-150. 4.9 I6 247k. 10w-40 Castrol Syn-blend ACDelco UPF2.
2005 Cadillac STS N* 108k. 5w-30 Castrol Magnatec ACDelco Classic PF61

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#4457855 - 07/13/17 04:23 AM Re: 1999 4.3 Intake gaskets and coolant flush [Re: nwjones18]
Lubener Offline


Registered: 01/22/11
Posts: 2577
Loc: N.Ohio
Originally Posted By: nwjones18
Originally Posted By: barkingspider
I had this happen on an 02 S10. After replacing the intake manifold gaskets and valve cover gaskets, I recommend replacing the radiator, heater core, all coolant hoses, coolant overflow tank, and water pump. Then change the oil, drive for a day, change oil again, then do short oci until u are satisfied all coolant is gone from the crankcase. This is what I did, truck ran normal, had good AC and heat, zero leaks


I like your style, but there is no way I'm messing with that heater core if I can flush it out and it doesn't leak.. What a pain in the butt. I can get a radiator off ebay/amazon for $50 so I may just go ahead and do that.


Replacing all that is total overkill.
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#4458252 - 07/13/17 01:05 PM Re: 1999 4.3 Intake gaskets and coolant flush [Re: nwjones18]
nthach Offline


Registered: 01/02/04
Posts: 3909
Loc: California
You can try to flush out the cooling system with a detergent to try to get rid of the oil residue and then with citric acid to put a dent on the Dex-Sludge. The Mercedes guys who do acid flushes say to begin using Shout as the detergent.

A few here say if you can find old school phosphated Cascade(I think P&G sells it as Cascade Professional fryer cleaner), even better as you have something that doesn't foam up.

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