Indicates a bad head gasket or a cracked head.
Coolant in the oil, low compression on the cylinder where the gasket is blown, air bubbles in the radiator, sweet smell at the tailpipe, white smoke at the tailpipe, especially at startup, & loosing coolant with no apparent leak.
Almost always there will be oil present in the coolant ( look for white milky appearance in radiator) or will be coolant present in oil. (pull oil dipstick & look for milky appearance also) you can also take off radiator cap & you can see air bubbles surfacing from coolant. Finally a compression check of all cylinders will show inconsistency between any adjacent cylinders.
Don't! Most cars have a reservoir for radiator coolant ... add liquid to the reservoir. Opening the radiator cap introduces air into the sealed system ... you don't want air bubbles in the cooling system.
The yellow radiator light on your Honda Accord is an indicator of low coolant in the radiator. The red radiator warning light is an indication of the engine overheating.
White smoke (steam) coming out the exhaust that has a sweet smell to it.You are always adding coolant to the reservoir but never see a leak. Constant air bubbles coming out if the radiator coolant when engine is running and radiator cap is off. Engine overheats for no apparent reason. A compression test will determine which cylinder/head has the problem.
Pull out the oil dipstick, if it has a chocolate milk-like consistency to it that would show that coolant has leaked into your oil and would be a pretty good indication that your head gasket has gone. Other symptoms are white smoke from the exhaust, loosing coolant with no apparent leak, a white foamy substance on the underside of the oil fill cap, & air bubbles escaping from the radiator with the cap off engine running. A compression test will verify this.
Until it cools down, which will be an indication that the coolant has depressurized.
To bleed the cooling system, start by ensuring the engine is cool and the radiator cap is removed. Fill the radiator with coolant until it's full, then run the engine with the heater on high. As the engine heats up, air bubbles will escape; keep an eye on the coolant level and add more if necessary. Once no more bubbles appear and the coolant level stabilizes, replace the radiator cap securely.
Bubbles in the radiator sight glass usually indicate air trapped in the coolant system. When air enters the system, it can prevent proper circulation of coolant, leading to inefficient cooling of the engine. This can result in overheating and potential damage to the engine components. Purging the air from the system and ensuring proper coolant levels can help resolve this issue.
To bleed the coolant system on a 1999 Mazda 626, first ensure the engine is cool and the radiator cap is removed. Start the engine and let it idle with the heater set to maximum, allowing the thermostat to open and air bubbles to escape. As the coolant level drops, gradually add more coolant to the radiator until it is full, then replace the radiator cap securely. Allow the engine to reach operating temperature, checking for any air bubbles and topping off the coolant as needed.
If your exhaust is getting in your coolant, you have a reeeeeeeeeeeeaaaaaaaaaaaaaaaaallllllllllllllllllyyyyyyyyyyyy major malfunction.
you have a blown head gasket .