Q: Car overheats and air conditioner not working

asked by on

My car overheats, and the air conditioner is not working. A mechanic told me the head gaskets are most likely blown.

While having a broken A/C is a big inconvenience, having your Pontiac overheat is a much bigger concern that we will need to addressed first. When your Grand Am overheats, the temperature rise inside causes damage to the engine and its components. You mentioned you had a mechanic look over the car previously but it is unclear by the description if that was a proper diagnosis or an estimate.

A head gasket replacement is a major job for your Grand Am and the diagnosis should be sure before moving forward with the job. There are a couple of tests a seasoned mechanic can do to give you a solid diagnosis. The first test I would perform is a cooling system pressure test. This test allows me to pressurize the system and check for signs of any coolant leaks.

If the system is loosing pressure and I do not see a leak externally, the next test I would perform is called a block test. This test takes place with the engine running, using a special tool that looks like a clear tube that holds a special fluid that turns from blue to yellow if exhaust gases are detected in the coolant. If exhaust gases are detected in the cooling system then it is indeed likely the Grand Am has a failed head gasket. I would have a professional mechanic inspect your car’s overheating and AC issue as soon as possible.

After the concern with the head gasket is addressed, your professional mechanic will also be able to look into why your Pontiac’s A/C is not working.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Car overheats and air conditioner not working

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car won't start occasionally

Hello. It sounds like there may be an intermittent problem with the starter. A solenoid is located on the starter and it is possible that there is a bad spot on the solenoid that is preventing the car from starting...

Q: What kind of sealant if any do i need for the oil filter adapter gasket

I would not recommend using any sealer other than Ultra Grey by Permatex. When you remove the housing if you have a paper type gasket use the sealer, but if the gasket is a rubber o-ring then do not use...

Q: Knock sensor keeps setting off

I would recommend clearing the P0328 code and then see if the code returns. If the code returns and the engine does not have any knocking noise, then test and replace the knock sensor and retest the system. If the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...