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#1929953 - 06/21/10 09:42 PM What is the coolant reservoir for?
dsmith41 Offline


Registered: 03/25/08
Posts: 733
Loc: Kansas City Metro
That is probably a stupid question but I have had two Ford Rangers and the coolant reservoirs in both were always empty but I have never had any cooling problems. My Impala on the other hand, seems to be over filled. It is above the hot line when the engine is warm. Can this be harmful? One of my local shops filled it recently when they fixed a coolant leak.

As long as the actual radiator is filled to capacity, what is the clear plastic reservoir for?
_________________________
1995 Ford Ranger 2.3L
2001 Chevy Impala 3800
1980 Wheel Horse C-145 8 Speed


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#1929959 - 06/21/10 09:48 PM Re: What is the coolant reservoir for? [Re: dsmith41]
simple_gifts Offline


Registered: 07/26/04
Posts: 11443
Loc: Middlesex County CT
hot fluid expands.
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2004 Prius; 77K Magnatec 10w-30
2003 Echo > 4.1x10^5 miles; 5w-50
2006 B2300;117K;ALM


Was driving an ox cart; Now on the USS Enterprise

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#1929961 - 06/21/10 09:50 PM Re: What is the coolant reservoir for? [Re: dsmith41]
beast3300 Offline


Registered: 12/24/09
Posts: 3146
Loc: Ohio
For expansion and reserve. When the coolant is hot it expands. The radiator cap keeps the pressure in the radiator to a specified amount, the rest pushes into the overflow.

When the engine coolant cools down, the coolant is drawn back into the radiator as the fluid contracts.
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#1930006 - 06/21/10 10:25 PM Re: What is the coolant reservoir for? [Re: simple_gifts]
Bill in Utah Offline



Registered: 11/11/02
Posts: 12839
Loc: UT
Originally Posted By: simple_gifts
hot fluid expands.



ding... we have a winner! happy

And on your Fords make sure you have some coolant ALWAYS in the reservoir!

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#1930029 - 06/21/10 10:49 PM Re: What is the coolant reservoir for? [Re: Bill in Utah]
Garak Offline


Registered: 12/05/09
Posts: 21489
Loc: Regina, Saskatchewan, Canada
Originally Posted By: Bill in Utah
ding... we have a winner! happy

And on your Fords make sure you have some coolant ALWAYS in the reservoir!


Ding ding! Another winner. All the older Fords that I've had (or have) with those big, boxy reservoirs always seem to go low over time. They simply do not seal well and there's always evaporation.

Originally Posted By: dsmith41
That is probably a stupid question but I have had two Ford Rangers and the coolant reservoirs in both were always empty but I have never had any cooling problems.


See my comment above. What years are the Rangers?
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Plain, simple Garak.

2008 Infiniti G37 coupe - Mobil Delvac 1 ESP 5w-40, Baldwin B1402
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#1930197 - 06/22/10 05:29 AM Re: What is the coolant reservoir for? [Re: dsmith41]
Char Baby Offline


Registered: 05/25/05
Posts: 8980
Loc: ROCHESTER, NY
Originally Posted By: dsmith41
That is probably a stupid question but I have had two Ford Rangers and the coolant reservoirs in both were always empty but I have never had any cooling problems. My Impala on the other hand, seems to be over filled. It is above the hot line when the engine is warm. Can this be harmful? One of my local shops filled it recently when they fixed a coolant leak.

As long as the actual radiator is filled to capacity, what is the clear plastic reservoir for?


Overflow!
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#1930599 - 06/22/10 01:02 PM Re: What is the coolant reservoir for? [Re: Garak]
Andrew MKZ Offline


Registered: 10/04/09
Posts: 2811
Loc: USA
Originally Posted By: Garak


Ding ding! Another winner. All the older Fords that I've had (or have) with those big, boxy reservoirs always seem to go low over time. They simply do not seal well and there's always evaporation.




+1
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23,500 miles

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#1930784 - 06/22/10 04:07 PM Re: What is the coolant reservoir for? [Re: Andrew MKZ]
dsmith41 Offline


Registered: 03/25/08
Posts: 733
Loc: Kansas City Metro
My current Ranger is an 05 FX4 and I used to have a 1996 reg cab shortbed 5 speed.

I have some Peak Lifetime Global 50/50 in my garage that I think I will top it off with tonight. It says it's universal so I'm going to assume it will be okay with the Motorcraft Gold. It shouldn't take much anyway.
_________________________
1995 Ford Ranger 2.3L
2001 Chevy Impala 3800
1980 Wheel Horse C-145 8 Speed


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#1930796 - 06/22/10 04:22 PM Re: What is the coolant reservoir for? [Re: dsmith41]
mechanicx Offline


Registered: 10/23/09
Posts: 8576
Loc: Ohio
It is a good idea to keep the Impala's reservoir a little overfilled to help insure air does not get drawn back into the radiator. Older cars didn't have reservoirs and ran a little low in the radiator until warmed up and at lower pressure. A reservoir is better and a pressurized reservoir is better still especially with modern coolants.

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