2002 coolant overflowing
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Mountain Pass
Joined: Sep 2011
Posts: 139
Likes: 0
From: Forest River ND
2002 coolant overflowing
I just bought a 2002 7.3 that has a problem with the cooling system pressurizing when it's running. The heater hoses also stay cool to the touch when the temp gauge comes up to normal. It looks to have a new water pump on it. Could it be a blown head gasket? Also has a sharp knock in the top end that the original owner said was there for two years with no problem. I'm thinking loose injector maybe? Any thoughts would be great. Thanks Ray
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 10
From: Snohomish, WA
Most likely the injector cup is cracked just below the o-rings. It could be other issues too, but the cup is what you want it to be really. Are you sure you are not having fuel in the coolant too?
is a BAAAD MAN
Joined: Apr 2005
Posts: 3,738
Likes: 5
From: Winston Salem NC
When my cups cracked there was obvious diesel in the coolant, it would float on top and be pushed out the cap every time I drove it. It stunk pretty bad and stained the driveway. I assumed the op would have noticed this but he can't be making coolant unless he's been adding it.
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 10
From: Snohomish, WA
I guess what he wrote is considered normal. "cooling system pressurizes when running". I was thinking over pressurizing and overflowing.
The heater hoses staying cool doesn't surprise me to much. Sounds like a stuck thermostat and possibly the dash gauge is reading normal, although it is colder than normal.
The heater hoses staying cool doesn't surprise me to much. Sounds like a stuck thermostat and possibly the dash gauge is reading normal, although it is colder than normal.
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Mountain Pass
Joined: Sep 2011
Posts: 139
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From: Forest River ND
Ok Sorry it's over pressurizing and blowing coolant out.The temp gauge shows that it's just into the normal range after 5 to 10 minutes at idle. I can't tell if there is fuel in the coolant by smell. Maybe need test strips? Any way to pinpoint injector cups? What would be normal for temp at idle after 5 to 10 minutes? Thanks Ray
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Post Fiend
Joined: Feb 2002
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From: Carhenge
Hotshot
Joined: Jan 2002
Posts: 17,988
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From: La La Land
With the proper Supplemental Coolant Additive (SCA), low silicate "green" coolant will work just fine in your engine, though it originally came with gold coolant.
My best guess is what Clux first advised above, and if it still HAS the long-stemmed thermostat, take it out and boil it in water to ensure it actually opens. If it's the short one, get a long one from (yes, best place) the dealer.
If you still have the problem, look for debris-clogged radiator fins, and then for clogged internal radiator tubes.
Unless it's been grossly over-heated, blown head gaskets are not real common on 7.3's.
Of course, anything's possible........
Pop
My best guess is what Clux first advised above, and if it still HAS the long-stemmed thermostat, take it out and boil it in water to ensure it actually opens. If it's the short one, get a long one from (yes, best place) the dealer.
If you still have the problem, look for debris-clogged radiator fins, and then for clogged internal radiator tubes.
Unless it's been grossly over-heated, blown head gaskets are not real common on 7.3's.
Of course, anything's possible........
Pop
Lead Driver
Joined: Sep 2005
Posts: 9,399
Likes: 188
From: Norco,CA
If its over pressurizing and you cap is good it could be a head gasket. Its not common is the 7.3 but I had a lot of them in my old 6.2 chev's. Couldn't keep head gaskets in them. If this happen someone probably blew a hose and keep running it in stead of stopping till fixed. This is what happens in the 6.0L, it gets hot boils the coolant and blows the head gasket. I hope thats not your problem. Have it pressurized at a radiator shop and see if it holds. They also have equipment they stick in the coolant tank to tell also. Post back.
Chet
Chet