Skip the auto shop - Our mechanics make house calls

Q: Weird coolant leaks.

asked by on

So, I recently bought a truck that had a head gasket replaced on it. It drove fine for about 2 weeks, and I did an oil change as the oil in it had sat for around a year and was old anyway. When I cranked the truck back up, it ran fine for 2 or 3 minutes as I was letting the oil run through to look for leaks, then coolant started dumping out around the hose that connects to the thermostat housing. I tightened the seal, and it fixed that leak... so I cranked it again, and once again after it ran for a couple minutes it started dumping coolant everywhere... worse than before this time. Looks as if its coming from the lower radiator hose. I cracked open the radiator cap to see the level of the coolant after it cooled down, and there was a loud hiss and coolant poured out as if the radiator was still hot. Smells like exhaust and there is mud like stuff around the cap, but the coolant itself and the oil are both clean... I can't figure this one out and I need my car running again!

My car has 156000 miles.
My car has an automatic transmission.

A: The issues you’re describing are very commo...

The issues you’re describing are very common when the head gasket was damaged and repaired. When the head gasket fails, water or coolant finds its way into the engine and mixes with the engine; but the reverse is also possible (of having oil seep into the cooling system). This is probably the "mud like stuff" that’s under the radiator cap. The best way to diagnose the source of the leaks and to clean up your coolant system is to have the radiator flushed. I would have a professional pinpoint the coolant leak in order to have this addressed properly.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: was getting PO440 CODE.

These valves are controlled by the PCM so the circuit will not be closed until commanded by the PCM and that closure can be through the ground side. If the circuit is competed through the ground side, you will always...

Q: AC stopped working after refrigerant was added - 1994 Dodge B350

There are a few areas to consider when dealing with air conditioning problems. First and foremost, the system requires a proper full charge of refrigerant in the lines and working fans both under the hood and in the cabin. If...

Q: How much it cost to replace all sensors on lexus 300 rx

More specificity would be required to answer this question. There are oftentimes hundreds of sensors on an automobile. Therefore replacing all of the sensors would not only be very inefficient from a cost standpoint but also unneccessary. If you are...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.