Need to change the coolant in my 62 for the first time. I have the FSM and it shows pulling two drain plugs then replacing the coolant. I have 3 gal of coolant and 3 gal of D.I. water which I read in another post is what was needed. Is there anything else to know? I have read in some other posts that you need to burp the system but the FSM doesn't say anything about that.
The 2 drains are the radiator drain and the block drain, which is back on the left rear of the block. Open the heater valves full blast so they drain too.
Consider filling with tap water and circulating for 5 minutes and then drain that too.
Close the drains, keep the heater valves fully open and slowly add the new fluid mixed at 50% with distilled water. It helps if the nose of the truck is slightly uphill.
Once full, start the truck-add coolant to keep the rad full. Once it warms a bit and starts to expand and run out the radiator fill, install the radiator cap.
Install a NEW radiator cap. There is nothing to burp. Keep the recovery tank full with the same 50% solution of coolant. After 10 start stop cycles it will purge all the air and replace with coolant. That's why you keep the recovery tank full. I check it daily for a week or two after a service of this type.
If you don't know when it was last done, this is a good time to replace the thermostat and the large (and thus failure prone) coolant hoses.
Inspect the heater hoses under the truck-they can be a source of pain and no one ever services them.
Distilled is what I meant. I am sure the servicing of the hoses was never done. The p.o. Gave me a stack of record and there wasn't anything in there about them.
Would you recommend OEM hoses or are there good aftermarket. Got any part numbers and length's if you used aftermarket.
