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Coolant Question No Radiator Cap #4804939
07/04/18 10:22 AM
07/04/18 10:22 AM
Joined: Dec 2006
Posts: 2,822
Columbus, Ohio
John_K Offline OP
John_K  Offline OP
Joined: Dec 2006
Posts: 2,822
Columbus, Ohio
My wife's Grand Marquis is the first car I have ever worked on with no radiator cap. The overflow tank is pressurized. Does this mean the coolant level in the tank is the same as in the radiator, or does it blow back and forth with pressure? I am used to just popping the cap and looking at the radiator level.


2009 Mercury Grand Marquis, 8 cyl auto, 83xxx miles, PU/Fram Ultra
2005 Hyundai Sonata, 4 cyl auto, 96xxx miles, Maxlife/OEM Filter
Current oil stash: 527 qts.


Re: Coolant Question No Radiator Cap [Re: John_K] #4804949
07/04/18 10:30 AM
07/04/18 10:30 AM
Joined: Dec 2011
Posts: 5,000
North Carolina
rooflessVW Offline
rooflessVW  Offline
Joined: Dec 2011
Posts: 5,000
North Carolina
Radiator cap is on the coolant bottle. The radiator is completely full on these systems and the level is checked in the bottle.


"Zed's dead baby, Zed's dead."
Re: Coolant Question No Radiator Cap [Re: John_K] #4805018
07/04/18 12:22 PM
07/04/18 12:22 PM
Joined: Dec 2017
Posts: 2,793
SE British Columbia, Canada
Snagglefoot Online content
Snagglefoot  Online Content
Joined: Dec 2017
Posts: 2,793
SE British Columbia, Canada
Correct as above plus the fluid goes back and forth with thermal expansion. If you are changing the fluid, check for a drain valve but many cars do not have those either, and you have to pull a hose off at the bottom of the rad. You add the fluid at the expansion tank or if you prefer you can pull off the small hose to the rad and use a funnel. Your choice.


If you want the job done right......do it yourself.
Re: Coolant Question No Radiator Cap [Re: John_K] #4807341
07/07/18 04:25 AM
07/07/18 04:25 AM
Joined: Jan 2011
Posts: 2,786
N.Ohio
Lubener Offline
Lubener  Offline
Joined: Jan 2011
Posts: 2,786
N.Ohio
I just replaced coolant in my GM. I pulled the lower hose at the radiator to drain. I have heard bad stories about some of the plastic petcocks either breaking or seeping.Fill the bottle to the marks and watch it for a couple days as you will need to top off until all the air is out. It should be filled with G05 coolant.

Last edited by Lubener; 07/07/18 04:28 AM.

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