Dex Coolant Question
Thread Starter
Racer
Joined: Mar 2022
Posts: 354
Likes: 193
Dex Coolant Question
what is the effect/consequences of only using 4 qts of Dex instead of the 4.5 recommended amount?
i cannot imagine half a quart makes a difference.
i live in San Diego, so i am not worried about freezing temps.
i drive in the desert, where it is often 110 to 120 degrees.
would the car overheat at speed?
thx
i cannot imagine half a quart makes a difference.
i live in San Diego, so i am not worried about freezing temps.
i drive in the desert, where it is often 110 to 120 degrees.
would the car overheat at speed?
thx
Team Owner
Joined: Jul 2004
Posts: 28,472
Likes: 3,290
From: Hartford WI
what is the effect/consequences of only using 4 qts of Dex instead of the 4.5 recommended amount?
i cannot imagine half a quart makes a difference.
i live in San Diego, so i am not worried about freezing temps.
i drive in the desert, where it is often 110 to 120 degrees.
would the car overheat at speed?
thx
i cannot imagine half a quart makes a difference.
i live in San Diego, so i am not worried about freezing temps.
i drive in the desert, where it is often 110 to 120 degrees.
would the car overheat at speed?
thx
Capacity is 11.8
Specification is 40% coolant and 60% water.
What you have is 4 quarts which gives a 33.898% vs 40.67. Sorry. Engine is wasted.
Thread Starter
Racer
Joined: Mar 2022
Posts: 354
Likes: 193
in response to kodpkd,
who asked,
Is this because you don't want to purchase another quart of DEX?
several answers for you.
1. no, i originally purchased two gals of Dex because i cannot find it in quarts at any of my local auto stores
2. was simply curious if and why half a quart would make a difference.
many people on the forum are apparently physics and chemistry professors,
so i was hoping for someone to educate me
3. i do not look forward to either wasting 3.5 quarts
or
letting it sit in the garage for 5 years.
who asked,
Is this because you don't want to purchase another quart of DEX?
several answers for you.
1. no, i originally purchased two gals of Dex because i cannot find it in quarts at any of my local auto stores
2. was simply curious if and why half a quart would make a difference.
many people on the forum are apparently physics and chemistry professors,
so i was hoping for someone to educate me
3. i do not look forward to either wasting 3.5 quarts
or
letting it sit in the garage for 5 years.
Team Owner
Joined: Jul 2004
Posts: 28,472
Likes: 3,290
From: Hartford WI
in response to kodpkd,
who asked,
Is this because you don't want to purchase another quart of DEX?
several answers for you.
1. no, i originally purchased two gals of Dex because i cannot find it in quarts at any of my local auto stores
2. was simply curious if and why half a quart would make a difference.
many people on the forum are apparently physics and chemistry professors,
so i was hoping for someone to educate me
3. i do not look forward to either wasting 3.5 quarts
or
letting it sit in the garage for 5 years.
who asked,
Is this because you don't want to purchase another quart of DEX?
several answers for you.
1. no, i originally purchased two gals of Dex because i cannot find it in quarts at any of my local auto stores
2. was simply curious if and why half a quart would make a difference.
many people on the forum are apparently physics and chemistry professors,
so i was hoping for someone to educate me
3. i do not look forward to either wasting 3.5 quarts
or
letting it sit in the garage for 5 years.
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Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,820
From: Charlotte, NC (formerly Endicott, NY)
what is the effect/consequences of only using 4 qts of Dex instead of the 4.5 recommended amount?
i cannot imagine half a quart makes a difference.
i live in San Diego, so i am not worried about freezing temps.
i drive in the desert, where it is often 110 to 120 degrees.
would the car overheat at speed?
thx
i cannot imagine half a quart makes a difference.
i live in San Diego, so i am not worried about freezing temps.
i drive in the desert, where it is often 110 to 120 degrees.
would the car overheat at speed?
thx
To make sure I get the ratios correct in the cooling system, I repeatedly drain/refill with water/run the engine until the thermostat opens/drain until the drained fluid runs clear. Then I close the petcock and add the amount of Dex I calculated and top off with water. Then I run the engine at 2500 rpm for a couple of minutes after the thermostat opens to burp out any air.
Bill
Melting Slicks
Joined: Feb 2018
Posts: 2,177
Likes: 1,044
From: North Texas
I always use an AirLift to remove any trapped air in the system.
If air is trapped, running the engine will develop hot spots and can warp the Al heads.
AirLift assures that all the trapped air is removed.
If air is trapped, running the engine will develop hot spots and can warp the Al heads.
AirLift assures that all the trapped air is removed.
Race Director
Joined: Sep 2000
Posts: 11,143
Likes: 1,913
From: Missouri City, TX
Bingo. Heat capacity of water is 1.0 BTU per lb-degF. Only 0.60 for pure EG. So a typical 50/50 mix gives you 0.80. So more water than EG has greater heat transport capacity than increasing the EG content.
Burning Brakes
Joined: Jan 2019
Posts: 954
Likes: 377
From: Louisiana
The service manual also recommends vacuum filling the system. I just use a knock-off kit with tons of adapters.