E 150 Van V8-351 5.8L VIN G 2-bbl (1984)
We are sorry that we must inconvenience you again by asking you to return your Econoline-based ambulance to your Ford or Ford Heavy Truck dealer.
However we do wish to maintain your confidence in our vehicle. Thank you for your continued cooperation in this matter of mutual concern.
THE IMPORTANCE OF PROPER COOLING SYSTEM ANTI-FREEZE MIXTURE
It is extremely important that the proper anti-freeze mixture be used in your ambulance cooling system, and that it be maintained at recommended levels.
Ford recommends that a reasonably fresh 50% anti-freeze concentrate and 50% water mixture be maintained in the cooling system of your ambulances at
all times. This mixture provides adequate freeze protection for most areas (50/50 mixtures provide protection to - 35~F). It also provides optimum
engine cooling and corrosion protection for the system.
Increasing the anti-freeze concentration above 50% will reduce engine cooling and result in hotter engine operation. If you are in extremely cold area, it
is permissible to use a 60% anti-freeze concentrate and 40% water providing protection to approximately - 60~F, but only during the winter months.
(This is a revised coolant manufacturer recommendation from the information sent to you in June, 1988, in a Motorcraft booklet "Cooling System
Operation and Maintenance", dated April, 1979). The mixture should be returned to 50/50 at the end of your cold season. As the concentrate percentage
gets larger beyond 60% concentrate, the freeze protection is less. A 100% anti-freeze concentration only protects your cooling system to - 8~F.
Decreasing the anti-freeze concentration below 40% reduces corrosion and freeze protection (40/60 mixtures provides protection to - 10~F).
Remember:
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Maintain cooling system mixtures at 50/50. Do not allow the mixture to be above 60/40.
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Replace your cooling system mixture annually.
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Replace lost coolant with a 50/50 mixture. Keep a pre-mixed supply of 50/50 mixture to refill the system.
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Do not refill your system with pure anti-freeze.
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Regularly inspect and repair any cooling system leaks.
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Replace cooling system hoses before they fail. Follow the Ford recommended replacement intervals.
