Q: Car losing coolant fast.

asked by on January 11, 2016

I think I might have a blown head gasket. I had a bad thermostat. Suffice to say the car overheated and the engine was damaged. I replaced the thermostat, and the car still drives okay, but I have to add water to the radiator constantly.

Hello, if you don’t see any exterior leaks, then you most likely have a blown head gasket. Pull your engine oil dipstick and see if it looks like oil or chocolate milk. If it looks like chocolate milk the gasket is blown and I would not recommend driving the car to avoid any further damage to the engine. Since you keep adding water and the oil is good the head gasket is leaking and need to be replaced. This should be done sooner than later to avoid any further engine damage. With the head removed, the head should be sent out to surfaced since it will be warped. Failing to do this will ultimately result in another head gasket failure quite quickly.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

What others are asking

where is the transmission dipstick located

The 2015 Nissan Sentra is equipped with a CVT transmission. CVT transmissions typically do not have a dipstick and are only serviceable from the bottom of the vehicle via a drain and fill plug. CVT transmissions also require a specific...

Code p0505

For the P0505 code, you should make sure that the PCV valve is clean or you should have the valve replaced. The throttle idle valve should be removed and throttle plates and IAC passages cleaned out. Make sure there is...

My car shakes when braking

Hi and thank you for contacting YourMechanic. That shimmy that you feel while braking is most likely your rotors are warped. This is due to excessive heat. Replacing your front rotors and brake pads will most likely take care of...

Overheating indicator on

Overheating can be caused by many things. Low coolant is the most common one. I would start by making sure the coolant level is appropriate. A bad thermostat, air pocket, or a fan that is not coming on when needed...

Headlights work intermittently

The headlights work on a high voltage circuit including relays and fuses for over voltage protection. The vehicle may be experiencing faulted relays or the switch that powers the headlight circuit. I recommend having a technician experienced in vehicle electrical...

p0117 code and engine heating to 75% of temp gauge (but no further)

You will have to scan the computer when the engine is cold and look at the data to compare the ECT and the IAT. This is the inlet air temperature sensor and the engine coolant temperature sensor. Both sensors will...

04 impala overheat changed waterpump n thermostat still overheat now stop running

At 200 thousand miles, the overheating could really be just about anything. But if you drove the car while it was overheating, there may have been some damage done that is causing your starting problem. Common causes of overheating are...

Rear brakes make a loud squealing noise

Brake squeal can occur on the Cruze's rear brakes due to brake dust accumulating in the drum. One thing that can be done to limit or eliminate the noise is to have the rear drums taken off, have the brake...

My car won't shift into 3rd, 4th, and reverse.

Hi there. The gears 3rd and 4th are both on the main shaft inside the transmission. Those gears have a synchronizer that connects the gears together. The reverse gear does not have a synchronizer to make the gear work. It...

Related articles

3 Essential Things to Know About Your Car’s Temperature Gauge
A car temperature gauge shows how hot the engine is. If the temperature gauge reads high, your car could be leaking coolant or have a bad water pump.
Symptoms of a Bad or Failing Cooling Fan Relay
Common signs include the engine running hot and cooling fans either not functioning or running all the time.
How to Buy a Good Quality Cooling/Radiator Fan Motor
Fans Fans are necessary to keep the components under your car’s hood from overheating. Excessive heat can cause warping, melting, and other damage, not to mention the additional energy suck. The radiator is one of the hottest parts in the...