overheated jeep grand cherokee 2006. coolant boiling in reservoir
My car got overheated and did not want to start anymore. We also noticed some leak from the radiator at the bottom. When I started the car when it was cold it started fine but I noticed after some time that the water in the reservoir started boiling. My brother told me it is the gasket. However he did not notice water in the motor oil. When we filed the radiator it took only a little bit of water. the check engine light is also on. is it the gasket? or the thermostat or the radiator?
Sounds like a head gasket our an air pocket most auto parts store sell had gasket testers you might want to get one
My 2006 Jeep cherokee did the same thing, NOPE, no blown head gasket but air in the coolant system from a failing water pump. I drained the system, did a thermostat, and water pump, then bled the line (left the bleeder valve off and radiator cap off with heat on), then slowly, slowly, slowly filled the bleeder valve until it was full, and all bubbles came out. Then I knew it was bled (took about 30 minutes of slowly adding and letting air release), and put on cap and bleeder valve, then it pressurized up, and no more overheating, no more overflow boiling. Yes this feels like a head gasket, as they resemble the same thing, but if you shut down the car, let it sit for 5 minutes or so, and its still boiling, it aint the head gasket. The car isnt running, there is no pressure from the engine block, so no exhaust is exiting the engine and entering the overflow, instead the overflow is physically boiling from the issues preventing the car from cooling down. In my instance, it was the water pump and air in the system. I didnt change or touch the engine block (head or gasket) and after fixing the overheating issues, it no longer bubbles the overflow or boils the coolant because there is no head gasket leak, nor anymore issues with overheating! Keep it in mind, its not always what it seems.
