Why does my car keep over heating

SOURCE: Well my car allways over heats and coolent leeks

If it is leaking out of the radiator cap, then that means you need a new radiator cap. Your cooling system in your car is a sealed system. Sounds like your radiator cap is not sealing properly and when the cooling system is not longer sealed then the temperatures cause the coolant to boil whereas coolant not subject to the atmosphere does not boil. Start there.

Good Luck

SOURCE: my car is over heating when im going down the hwy

May have head gasket leak. If so will be loosing water, possibly quite slowly. At highway speeds cylinder pressure is higher and so gasket leak more likely. Means gasket damage or loose cylinder head. Can be checked by mechanic. (pressure test and cylinder head bolt tension test)
Less likely alternatives, the spark timing is too advanced or the fuel too poor.

Jeffrey Turcotte

• 8991 Answers
• Posted on Oct 05, 2010

SOURCE: I have a 1998 Oldsmobile bravada....just put new

the heater uses the compressor when you use the defrost setting to remove moisture from the air before it goes to the heater core. your controller may have lost it's adjustment and is turning the compressor on with floor heat. You would have to pull the control panel out to verify. Do you need instructions?

robert DIBBLE

• 448 Answers
• Posted on May 18, 2011

SOURCE: my cars heat gauge keeps

you can start your car use a temperature Gage the wife might have one that showes the temp.
match it to your temp Gage if its lower than the actual temperature you need a temperature sending unit you might want to check to see at what temp the fan comes on and off if that's not working you need a temperature censor switch


hope this helps you
bob

SOURCE: I have a 1999 oldsmobile

Hi,
Check the coolant if there is oil in it and the oil cap if there is a whitish brown substance under the oil cap, means you have a blown head gasket and needs a replacement!
The radiator fins is already blocked, cause by dirt and years of using deep well water, needs to be clean, replace or overhauled the radiator.
The fan is not working and needs to be check thoroughly its motor or electrical system( relay, motor, rad fan switch sensor).
check all of that and tell us what happened.