Updated 1990 460 EFI. Need advice!
#16
FYI, these trucks have 16-20 quart (4-5 gallons) coolant capacity. You must have a leak somewhere, or be burning coolant through the head gasket. Head gasket problems are rare with the 460 though. When cold, the coolant level should be to the very top of the radiator, and to the cold fill level in the overflow reservoir. You may want to invest in a cooling system pressure tester so you can pressurize the cooling system to 13 PSI and see if it holds pressure. If it doesn't hold pressure then you have a leak somewhere whether you can see it or not. You can also pick up an infared heat gun or temp probe for a multimeter for pretty cheap. That way you can point it at the radiator, thermostat housing, etc and see what temp you engine is actually running.
Thanks geoffunkel
#17
Well if you just drain and refill the radiator, maybe only 9 quarts or so will come out but the total capacity of the whole cooling system (including passages in the engine block, heads, etc, is 16-20 quarts depending on your radiator (Some have HD cooling package, A/C, Manual vs Auto, etc). Most blocks have drain plugs in them as well, although sometimes they are difficult to get to. You will never get every drop out unless you take apart the engine. So 2.5 gallons (10 qts) is probably a good guess for a simple radiator drain and refill.
The correct amount to fill is with the radiator completely filled to the top and then slightly above the cold mark on the overflow. This pretty much applies to virtually every car. I like to fill the radiator all the way up cold, then start the engine with the radiator cap off. The level will drop slightly with the engine running. Slowly add coolant and occasionally squeeze the top radiator hose to try to burp out any air in the system. When all air is out, and the radiator is topped off, then put the cap on. This should only take about a minute. Don't allow the engine to get hot with the cap off.
Oh, and I would do the pressure test before the drain and refill. If you do find a leak, you'll probably just have to drain it again.
The correct amount to fill is with the radiator completely filled to the top and then slightly above the cold mark on the overflow. This pretty much applies to virtually every car. I like to fill the radiator all the way up cold, then start the engine with the radiator cap off. The level will drop slightly with the engine running. Slowly add coolant and occasionally squeeze the top radiator hose to try to burp out any air in the system. When all air is out, and the radiator is topped off, then put the cap on. This should only take about a minute. Don't allow the engine to get hot with the cap off.
Oh, and I would do the pressure test before the drain and refill. If you do find a leak, you'll probably just have to drain it again.
#18
Well if you just drain and refill the radiator, maybe only 9 quarts or so will come out but the total capacity of the whole cooling system (including passages in the engine block, heads, etc, is 16-20 quarts depending on your radiator (Some have HD cooling package, A/C, Manual vs Auto, etc). Most blocks have drain plugs in them as well, although sometimes they are difficult to get to. You will never get every drop out unless you take apart the engine. So 2.5 gallons (10 qts) is probably a good guess for a simple radiator drain and refill.
The correct amount to fill is with the radiator completely filled to the top and then slightly above the cold mark on the overflow. This pretty much applies to virtually every car. I like to fill the radiator all the way up cold, then start the engine with the radiator cap off. The level will drop slightly with the engine running. Slowly add coolant and occasionally squeeze the top radiator hose to try to burp out any air in the system. When all air is out, and the radiator is topped off, then put the cap on. This should only take about a minute. Don't allow the engine to get hot with the cap off.
Oh, and I would do the pressure test before the drain and refill. If you do find a leak, you'll probably just have to drain it again.
The correct amount to fill is with the radiator completely filled to the top and then slightly above the cold mark on the overflow. This pretty much applies to virtually every car. I like to fill the radiator all the way up cold, then start the engine with the radiator cap off. The level will drop slightly with the engine running. Slowly add coolant and occasionally squeeze the top radiator hose to try to burp out any air in the system. When all air is out, and the radiator is topped off, then put the cap on. This should only take about a minute. Don't allow the engine to get hot with the cap off.
Oh, and I would do the pressure test before the drain and refill. If you do find a leak, you'll probably just have to drain it again.
I will definetly check the pressure first, When i drain and fill i drain everything out then stick the hose in there and let the truck run for about 20 minutes then turn the hose off and let all that drain out. then i put some coolant system cleaner in their and let it run for about an hour then drain and fill with coolant an distilled water. I know people hate stick normal water in their but sense im draining at the same time it sounds good to me i guess. Is that a pretty standard drain and refill?
#19
This is why I either buy a thermostat with a bleeder or drill a small hole in the flange.
It will pass enough air to let you fill 99% of the cooling system.
Then overfill the reservoir a bit before you take that first drive.
The radiator draws from the bottom and it will take as much fluid as it needs when it cools down.
It will pass enough air to let you fill 99% of the cooling system.
Then overfill the reservoir a bit before you take that first drive.
The radiator draws from the bottom and it will take as much fluid as it needs when it cools down.
#20
This is why I either buy a thermostat with a bleeder or drill a small hole in the flange.
It will pass enough air to let you fill 99% of the cooling system.
Then overfill the reservoir a bit before you take that first drive.
The radiator draws from the bottom and it will take as much fluid as it needs when it cools down.
It will pass enough air to let you fill 99% of the cooling system.
Then overfill the reservoir a bit before you take that first drive.
The radiator draws from the bottom and it will take as much fluid as it needs when it cools down.
Hypertech/Thermostat - Performance 1018 at AutoZone.com
#21
The AZ link leads me to "Page Not Found".
Stant used to be good thermostats and radiator caps.
I would just drill a 3/32-1/8" hole in the flange.
RobertShaw from FlowKooler are good too.
Stay away from MrGasket products.
I don't buy any snakeoil like 'Failsafe' or whatever...
Why do I want a thermostat intended to fail???
Stant used to be good thermostats and radiator caps.
I would just drill a 3/32-1/8" hole in the flange.
RobertShaw from FlowKooler are good too.
Stay away from MrGasket products.
I don't buy any snakeoil like 'Failsafe' or whatever...
Why do I want a thermostat intended to fail???
#22
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