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Username Post: Coolant ratio?        (Topic#351980)
udidwht 
Poster
Posts: 32

Reg: 08-08-17
07-11-18 09:03 PM - Post#2739751    

I drained my coolant system from my Fleetwood RV (454 V8) which has a system capacity of 22.5qts. I marked a large container in gallon increments. Once drained the container measured exactly 3 gallons (not incl. what I spilled ). Best guess…roughly a quart or so. This was all in preparation for cooling hose (upper & lower) replacement as well as the by-pass hose.


I used Prestone 70/30 mix rather than 50/50 which was in the system prior to draining. Any idea what the coolant/water ratio would be now once mixed with the remaining 50/50 ratio? I’m guessing that given the system capacity is 22.5qts and I removed roughly 13qts or that there had to be roughly 10qts of 50/50 left in the engine.


I’d like to get back to the 50/50 ratio. I was thinking of just siphoning some of the coolant out of the radiator and then adding distilled water but need to know roughly how much coolant I should siphon before adding the distilled water?

1994 Fleetwood Southwind Storm
P-30 chassis 7.4L 454 TBI 56,4XX miles and counting....
VIN# 1GBJP37N4R3314754


 
454cid 
Valued Contributor
Posts: 2944

Age: 45
Loc: West Michigan
Reg: 02-18-12
07-11-18 09:51 PM - Post#2739754    
    In response to udidwht

61% coolant, 39% water.

If you drain a gallon of the mix and add water it will get you close.... like 52-ish. However, you're working with ball park numbers. Get a coolant tester.

99 K3500 RCLB


 
GreatNorthWoods 
"4th Year" Silver Supporting Member
Posts: 880
GreatNorthWoods
Age: 76
Loc: Littleton, New Hampshire,...
Reg: 03-31-02
07-12-18 05:02 AM - Post#2739762    
    In response to udidwht

I would just leave it as is. Don't know where you're located but here in the Northeast it is common to run as high as 75/25 since it goes to minus 20 in the winter here. My car is garaged all winter but I still run about 75%.

Vern

1953 Chevy Belair Sport Coupe - 355 Blueprint Engine, 700-R4, Vintage Air, EZ Wire, Ididit column, Cruise/Tilt, 59 Vette Steering Wheel, 4-Wheel Disc Brakes, Posies Springs, Coker Radials, Nova 10-bolt, Mustang II front, Continental Kit


 
udidwht 
Poster
Posts: 32

Reg: 08-08-17
07-13-18 07:30 PM - Post#2739919    
    In response to GreatNorthWoods

  • GreatNorthWoods Said:
I would just leave it as is. Don't know where you're located but here in the Northeast it is common to run as high as 75/25 since it goes to minus 20 in the winter here. My car is garaged all winter but I still run about 75%.



I'm in the Seattle area. Not much cold here. Today was pushing 90F. During winter average temps are 40-50F for lows. Occasionally it may drop below freezing but not very often.

I did siphon out 1 gallon of coolant out of the radiator and replaced it with 1 gallon of distilled water. Seems to have had a positive effect on the dash temp gauge. The last 2 days temps here have been 85-90F. Been driving the RV to work (18 miles) 15 of those are freeway and 5-6 in heavy traffic. RV ran great and dash gauge during highway speed (60mph) stayed 210F - 1/2 needle width to the right of 210F (middle of gauge).

It did briefly creep up to roughly 220 or so after hitting traffic (heat-soak) but recovered nicely. Clutch fan is working nicely as well.



1994 Fleetwood Southwind Storm
P-30 chassis 7.4L 454 TBI 56,4XX miles and counting....
VIN# 1GBJP37N4R3314754


Edited by udidwht on 07-13-18 08:03 PM. Reason for edit: No reason given.

 
454cid 
Valued Contributor
Posts: 2944

Age: 45
Loc: West Michigan
Reg: 02-18-12
07-13-18 08:21 PM - Post#2739922    
    In response to udidwht

  • udidwht Said:
  • GreatNorthWoods Said:
I would just leave it as is. Don't know where you're located but here in the Northeast it is common to run as high as 75/25 since it goes to minus 20 in the winter here. My car is garaged all winter but I still run about 75%.



I'm in the Seattle area. Not much cold here. Today was pushing 90F. During winter average temps are 40-50F for lows. Occasionally it may drop below freezing but not very often.

I did siphon out 1 gallon of coolant out of the radiator and replaced it with 1 gallon of distilled water. Seems to have had a positive effect on the dash temp gauge. The last 2 days temps here have been 85-90F. Been driving the RV to work (18 miles) 15 of those are freeway and 5-6 in heavy traffic. RV ran great and dash gauge during highway speed (60mph) stayed 210F - 1/2 needle width to the right of 210F (middle of gauge).

It did briefly creep up to roughly 220 or so after hitting traffic (heat-soak) but recovered nicely. Clutch fan is working nicely as well.





I doubt that small of a change in the ratio will do much for running temperature. It was probably just a few degrees cooler out, or the humidity, wind, something was different from the other day.


99 K3500 RCLB


 
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