Skip the auto shop - Our mechanics make house calls

Q: The easiest way to empty the radiator

asked by on

I have an old car with vertical plastic radiator tanks. The hose is connected to the right side and it has a radiator cap on the left. Can I siphon the old coolant through the radiator cap? Also, I am about to clean the car and replace the air and gas filter.

A: Yes, you should replace the air and gas fil...

Yes, you should replace the air and gas filter. You don’t want to change every so many years because they get old and dirty and wear out. You can siphon only a little out through the radiator cap.

If you really want to empty out the radiator, the easiest thing is to just go to a bottom of the car when it is cold then unscrew the bottom radiator hose because that is just rubber and you can pull the bottom radiator hose off and drain it that way.

Now, some cars have drain plug on them and some don’t. But the problem is that no one hardly ever uses those drain plugs. So if it has been sitting there for 8 or 10 years, and you are trying to get that drain plug off, most of them are plastic and sometimes they snap off and break, in which you would have to replace the radiator. So it is much safer to take the bottom radiator hose out and then it will drain it perfectly fine that way. If you need help, you can have a professional mechanic perform a radiator flush for you, fuel filter change, and air filter change for you.

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: Truck is running rough, loses power, backfiring noise - 1994 Nissan D21

Hey there. I would check fuel pump output and condition of fuel injectors (flow rate and solenoid resistance). After that, I would evaluate the ignition system, including distributor, plug wires, timing. If you would like to have this checked for...

Q: Is it possible to crack an engine block by flushing the radiator?

Hi there: Is it possible - certainly. If the engine block is hot and the coolant being flushed is cold, it's actually rather simple for small cracks to develop inside the water passageways. It really depends on the condition of...

Q: Noise after the car is turned off, car idles rough - 1973 Nissan 240Z

Hello. It sounds like the starter relay might be bad and is causing the starter to stay on, which is the clicking noise that you are hearing. There could also be a problem with the starter solenoid. The problem you...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.