I'm truly jealous. I thought I got lucky when I bought my 2012 Lincoln in 2017 with 57,900 original miles on it. :) I'm not 100% sure but is that old north star an aluminum block? If so, I would consult GM as to what to use to flush it with. If it was still cast iron, you could probably get away with most any flush. The one thing that I would be careful of is if the water pump is the original, try to get something that is not too corrosive to protect the old shaft and bearing seals. Some of the heavy duty over the counter flushes contain carbolic or phosphoric acid to eat the calcium and lime scale out of your radiator. This is why they used to say that Coca Cola was a good flush because it contained phosphoric and CARBONIC ACIDS. Carbonic acid being the carbon dioxide dissolved in it to give it the fizz. Good luck.
SOURCE: How can I flush my whole coolant system
Preferable to flush as much out as possible to get rid of the old stuff and can be done at home by undoing the heater hose at the fire wall and using the garden hose to force water through until it comes out clean Dont turn hose on full blast as it will spray out over everything build up to it so it doesnt make a mess.Make sure the heater is in the on position so that water comes out the pipe you took the hose off.Either way though it will still be ok to just undo the bottom radiator hose as the majority of it will come out.
SOURCE: my 1999 Cadillac Eldorado north
The thermostat is usually located on the engine end of the upper radiator hose.
Drain the radaitor of coolant, remove the upper radiator hose from the housing.
Usually a couple of bolts hold the housing in place, once the bolts are removed, seperate the housing from the engine, you should now see the thermostat, you will also discover it has a gasket to be replaced at the same time. make sure the surfaces are clean, use some gasket cement to hold the new gasket in place. reassemble the unit, reinstall rad hose, and refill radiator.
Hope this is od some help.
Ed
SOURCE: Flushing Radiator and Replacing Coolant
yes you do
do this with the radiator cap off and keep adding till it is full after the thermostat opens let it burp all of the air out and keep topping off the radiator till the whole system is full
SOURCE: '97 Ford Escort leaking auto transmission fluid.
The front seal could be replaced, and not have a problem. If you have a shop other than a transmission shop do the repairs, make sure the torque converter hub is inspected to make certain its not scratched/scorn. If the trans shifts properly and the fluid is not burned or smells burned, this would be an easy repair. If the trans fluid smells burned, and hasn't been serviced regularly, the rebuild would be the way to go. Also, ask what the warranty for any and all repair are on your vehicle. Normal warranty is 1yr, 12.000 miles in the automotive business.
SOURCE: i have a 99 deville w/ 32valve north star engine
The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.
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