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Check the pressure cap and change the coolant if over two years old. While the cap is off see if there any bubbles or oil traces in the coolant, if so you have major engine problems, possibly a bad head gasket.
If you have a blown head gasket, surely you will overheat because some hot combustion gases are entering your cooling system. No way you can remedy it by bleeding the system. Bleeding the system is just removing the trapped air in it. Running the engine with out the radiator cap will do the trick.
Hi, I have a way to test for a blown head gasket. Since you have good compression, yours would have to be small. Recommend you park on an incline, remove the radiator cap, set the heater on high, start the car and let it warm up until there is flow in the radiator. Fill the radiator and keep it full while the engine continues to run. Look for any bleed ports the system may have either in the hoses or at the attach point housings. Crack any bleeders open to allow any air out. Top off the radiator all the way to the neck and make sure there are no bubbles coming up. Bubbles coming out the radiator are an indication of a blown head gasket. Please let me know if you have questions, and thanks for using FixYa.
try the thermostat first because it's the cheapest but just because there's no water in the oil doesn't mean that the head gasket isn't blown. there's a few ways to tell, first let the engine cool off completely and fill with water to the top of radiator then start it with the hood open and the radiator cap off and keep everyone away from it. if the head gasket is badly blown or the head has a crack in it, it will often blow large amounts of water out of the top of the radiator because of the pressure going past the blown gasket or crack. if you are only getting small bubbles coming up then hold a lighter to the opening of the radiator and see if you get an orange flame. if it passes both these tests then it's not likely to be the head. of course you'll need to replace the radiator but check for the cause of the overheating first before you buy a bunch of stuff you don't need because you may find that repairing it will cost more than replacing it if it's an older vehicle.
could be, but you can verify. First make sure there is no air bubble in your cooling system. Recommend you park on an incline, remove the radiator cap, start the car and let it warm up until there is flow in the radiator. Fill the radiator and keep it full while the engine continues to run. Look for any bleed ports the system may have either in the hoses or at the attach point housings. Crack any bleeders open to allow any air out. Top off the radiator all the way to the neck and make sure there are no bubbles coming up. Bubbles coming out the radiator are an indication of a blown head gasket. If no bubbles, close the cap. Check to see if the car is still overheating. When overheating is due to a blown headgasket, the bubbles are usually easy to see. Please let me know if you have any questions and thanks for using FixYa.
Could be a blown Head gasket or cracked head. Should be a drain at the bottom of the radiator I think on the drivers side. You will need to pull the heads off and have them checked Magnifluxed for cracks. If they find none then install new head gaskets and see what happens. I have the torque specs for your head bolts if you need them. Let me know.
The average sale price for a 91 Lexus in the US, is $3900.00. Used radiator would be around $200.00. Machine shop to machine the head (highly recommended) $500.00 to $1000.00. Gaskets and hoses another$200.00. I don’t know how much you have into it, but I hope this helps your decision.