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My sons truck keeps overheating. We used a head gasket repair solution and it seem to work, but last night it was cold and my son says the truck overheated. Not sure what else to check.
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I would say that you used Holts because of a leaking head gasket. You should be fitting a new head gasket so there should be no need for the use of holts.
Gasket fix rarely will work and you need to do a head gasket repair and check the heads for cracks at local machine shop, it's a typical problem with those engines.
This is the sign of a blown head gasket.
Since we don't know what caused the overheating in the first place, a crate motor, in the long run, may be the most cost effective means of resolving this issue.
If you are mechanically inclined, this may be an opportunity to teach your son how to clean up after his mess.
Sorry to say the head gasket is still shot, and you probably have cracked the cylinder head too. The excessive pressure in the radiator and the overheating is compression going from the cylinders to the cooling system. You may not be leaking coolant into the oil as fast as you were, but its still letting compression into the radiator.
Change thermostat new coolant , no leaks you have a head gasket, Your car is a reverse flow cooling system. This is one of GM biggest blunder they put out. You can try a radiator at least and make sure the cooling fan comes on when its suppose to.But there is no way around this the vehicle is sensitive to overheating and once that happens it over you will need a head gasket
Try to check to see if the electric fan is going on or off at the right intervals to keep the engine cool.
Check that the coolant level is high, and the concentration is 50/50 antifreeze to water.
Also, if the coolant system hasn't been backflushed, this may be an option to try to get the coolant passages clear, if they are clogged.
How hot did it get? Did the engine become damaged again?
Assuming the following; The head gaskets were replaced properly The Water Pump was replaced properly The Thermostat was replaced properly
There are only a few other things to check. 1) if you you remove one of the heater hoses from the engine bib during a cold filling from the radiator - it will release trapped air until you see the coolant coming out the motor side - this works great to ensure the air is out. Hook hose back up before running.(or you could leave the hose off for a second and start it to see if water gushes out - water pump check - kinda messy though)
Remember that heater water will circulate even with the thermostat is closed.
if that does not work, then you need to ensure the top hose going to the radiator warms up indicating the thermostat is opening and hot engine water is starting to dump into the radiator.
2) the radiator more than likely is clogged and needs cleaning by a radiator shop, or replacement if it is not one that can be cleaned.
Ask your son if he remembers looking into the water ports where he took off the old water pump, sometimes of the system is not flushed at proper intervals, it will sludge up the water jackets and keep water from circulating through the motor.
one last thing (gulp) That CO check is pretty accurate - and cheap. You might want to have it checked again - because the heads should have been inspected for cracks as well as pressure checked before putting them back on - especially since the motor overheated. That alone will crack the heads beyond repair - more so than not.
LOOK LIKE A BLOWN HEAD GASKET.YOU GOT WATER OR ANTIFREEZE IN OIL CRANKCASE THE HEAD GASKET IS LEAKING.THIS REPAIR OR FIX THE CYLINDER HEAD HAS TO BE REMOVED TO REPLACE HEAD GASKET.
Sludge in radiator is usually a head gasket or cracked head issue. Heating problems also occur and overheating is also common. Montanas have have a high head gasket failure.
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