Skip the auto shop - Our mechanics make house calls

Q: Pressure in the radiator hose after sitting all night on a '86 GMC Sierra 305

asked by on

I have an '86 GMC Sierra 305. I've noticed that my radiator hose have pressure in it the next day after sitting all night. Is that normal?

A: No, it's not normal. It should definite...

No, it's not normal. It should definitely cool down. Odds are your head gasket is starting to blow. I've got a video out there "how to tell if your head gasket is blown." Do that test and you'll see if it's blowing. It probably is. If you like the vehicle, I'd say get a head gasket job done. It's so old and those engines are so strong that it's worthwhile fixing it.

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・Save up to 30%

Get a quote

What others are asking

Q: How to clean out a gas tank that has been sitting for 10+ years.

Hi there, thanks for writing in. I've always found that the best way to clean a fuel cell, whether it's diesel or gasoline, is to remove it from the vehicle and flush it with a lot of solvent. The problem...

Q: Car overheats

HI. Overheating may be caused by common issues such as the fans not working, faulty thermostats, and low or leaking coolant. I suggest having a technician, such as one from YourMechanic, inspect the overheating issue. I would then suggest checking...

Q: Car has parasitic battery drain.

I would have a technician such as one from YourMechanic do a parasitic drain test on the battery. This is where you connect a amp meter to the battery and pull out fuses until the drain stops to determine where...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...