Question 1

Does Evans coolant require periodic maintenance?

Accepted Answer

No periodic addition of supplemental coolant additives is required, nor should any ever be added. Evans recommends inspecting the cooling system at least once a year to ensure that no contamination of the coolant has occurred.

Question 2

If I have a leak or other reason to top up my coolant - and Evans is not available, what can I safely add?

Accepted Answer

With Evans waterless coolant, the likelihood of coolant loss and the  need for topping up are greatly reduced. In the event that there is  significant coolant loss from the system during operation and no Evans  waterless coolant is available to fill the system, water or water-based  coolant may be used. However, repairs should be made as soon as  possible, and the system should be drained, purged and re-filled with  Evans waterless coolant.

Question 3

What if I get a leak?

Accepted Answer

Leaks should be repaired. Stop-leak type products are not intended to be  permanent repairs, but they may be used as a temporary measure.  Carefully follow the instructions on the stop leak product label.  Overuse may clog radiator and heater core passageways.

Question 4

What effect will mixing Evans coolant with water or water-based coolant have on my cooling system?

Accepted Answer

In the short term, no performance issues should result from mixing a  small amount of conventional coolant or straight water with Evans  waterless coolant. However, the high boiling point and corrosion  protection of Evans waterless coolant will be reduced, and the coolant  should be replaced as soon as possible.

Question 5

How do Evans coolants control engine material temperatures as compared to water based coolants under stressed conditions?

Accepted Answer

Water-based coolant boils at a temperature only slightly higher than the  operating temperature of the coolant. The boiling point of water-based  coolant is somewhat above the boiling point of water for the pressure of  the system. Localized boiling releases water vapor that can only  condense into coolant that is colder than the boiling point of water.  Any vapor that doesn’t condense occupies a volume that displaces liquid  coolant. Water vapor is a very poor conductor of heat. Hot engine metal,  insulated by water vapor, becomes an engine “hot spot” that can cause  pre ignition and detonation. In contrast, the boiling point of Evans  waterless coolant is much higher than the bulk coolant temperature and  any locally generated vapor condenses immediately into the surrounding  bulk coolant. There is no persistent vapor to insulate between hot metal  and the liquid coolant. Liquid coolant is in contact with all of the  coolant jacket at all times, providing a path of excellent heat transfer  away from the hot metal.

Question 6

How does Evans coolant prevent After-Boil?

Accepted Answer

After-boil occurs in an automotive engine after engine shutdown when the  heat in the system cannot be rejected to the air because the coolant is  no longer being circulated to the radiator. A coolant near its boiling  point will not be able to absorb additional heat without boiling and  being forced out through the pressure cap. Conversely, the huge  separation between the operating temperature and the boiling point of  Evans waterless coolant enables the coolant to act as a heat sink into  which heat from hot metal parts of the system can be readily dissipated.  Boiling is avoided and there is no build-up of pressure to force  coolant out of the system. Stresses on cooling system components are  avoided because metal temperatures are kept under control. Learn more  about how Evans waterless coolants prevent overheating.

Question 7

How does Evans coolant prevent water pump cavitation?

Accepted Answer

Evans waterless coolant inhibits vapor development in the pump over a  broad range of temperatures. With Evans waterless coolant, the suction  side of the coolant pump is never at a low enough pressure to flash  vaporize the coolant. So, the pump never gets vapor-bound and has the  ability to pump coolant over broad range of temperatures. No vapor  bubbles are formed to collapse against the metal and cause cavitation  erosion damage to the pump. Learn more about how Evans waterless  coolants prevent erosion.

Question 8

Will Evans coolant lower the operating temperature of my engine?

Accepted Answer

Typically no. Vehicles running under normal operating conditions should  show either no change or a slight increase in temperature, but that will  depend on cooling system configuration as well as driving conditions.  In high horsepower applications, the temperature effect of running Evans  waterless coolant will depend on the engine and cooling system  components. Certain systems that use incompatible components, have an  existing problem, or are poorly designed could run hotter.

Question 9

Is Evans advocating operating engines at higher temperatures?

Accepted Answer

Not really. With Evans waterless coolant, operating temperatures may be  modestly higher than those of water-based coolant, depending on driving  conditions and whether the vehicle is stock or configured as  high-performance. When the engine is stressed, the coolant absorbs more  heat and temperatures rise. This is not a concern when using Evans  waterless coolant. The combination of the high boiling point of Evans  waterless coolant and a correctly-sized cooling system means that an  increase in temperature can be accommodated without cooling system  failure.

Question 10

If I increase my engine horsepower and want additional cooling capacity, what suggestions do you have for radiators?

Accepted Answer

In general, Evans recommends single-pass radiators as they have less flow resistance than multi-pass radiators. The following are minimum radiator core suggestions:
 • 300HP or less without AC........................4 rows: ½” tube copper/brass
 • 300HP to 400HP with AC........................2 rows: 1” tube aluminium
 • 400HP to 600HP.......................................2 rows: 1.25” tube, aluminium
 • 600HP and above.....................................2 rows: 1.5” tube aluminium
 • 600HP and above.....................................3 rows: 1” tube aluminium