SAFTEY PRECAUTIONS

• When converting to EVANS “Waterless” Cooling never work on a conventional hot, pressurized water/antifreeze cooling system. Conventional water and antifreeze coolant spraying on a hot engine may ignite. Similar precautions should generally be adhered to with EVANS “Waterless” Coolants; coolant vapor may ignite if it is above 240°F and comes in contact with an open flame (leaking ignition spark, failed exhaust header, etc.) Always observe fire precaution warnings in your vehicle owner’s manual.
• Always use jack stands or ramps to work on a vehicle, never use a jack only.
• Always wear eye protection.
• Use caution near thermostatically controlled electric cooling fans, as they may activate even with ignition off.
• EVANS NPG Coolant is non-toxic to humans and animals. However, in some instances traces of ethylene glycol, a hazardous material often remain in the engine after conversion and mixes with EVANS NPG Coolant at which time, must be disposed of as hazardous waste. EVANS NPG+ Coolant has been tested as non-toxic to animals but must be disposed of in accordance to local regulations for antifreeze disposal.

A common misconception that EVANS “Waterless” Cooling System will operate hotter than water-based cooling systems. With a properly installed system, using the recommended pump and radiator with nothing else changed, the system will operate at the same temperature or often at a slightly lower temperature compared with a system operated on water-based coolant. However, if a major change is made to the fuel mixture or to increase compression, horsepower, or turbo boost, the system will operate hotter due to the higher output of the engine. Operating the engine at limits beyond conventional cooling capabilities will cause a conventional cooling system to run excessively hot, overheat and fail. The EVANS Cooling System will continue to operate, FAILURE FREE at that higher temperature (up to 280°F) without engine damage. However, whenever operating an engine at high coolant temperatures the oil temperature must be controlled and kept to a maximum of 250 °F, by using an oil cooler.

With “Waterless” Coolants the thermostat is not needed in Hi performance systems, or for warm weather application. For cold weather applications or computer controlled engines install a Evans High Flow or Evans total flow thermostat of the proper temperature. Systems that use bypass type thermostat must plug the bypass port when removing the thermostat. Large suction (inlet) side bypass thermostats can bypass small quantities of coolant due to the higher suction pressures created by the pump. This could result in slightly higher operating temperatures. To correct - install the Evans total flow thermostat in the upper (pressure) hose.

The bypass hose connects the intake manifold with the water pump suction side, BB Chevy, SB&BB Ford, SB MOPAR all use a thermostat bypass hose that is unnecessary for HIGH PERFORMANCE use. Plugging the bypass hose forces all the coolant to flow though the radiator. The plug should be made of metal and large enough to seal the ID of the hose. Pipe plugs can be used to eliminate the hose completely.

CAUTION: After blocking the bypass circuit, only the specially designed EVANS Hi Flow or Total Flow Thermostat should be used or engine damage may occur.

For leak problems, Bars Leak Tablets or AlumiSeal are the only approved stop leak product for “Waterless” Coolants. Evans STOPLEAK Tablets are also available.

When using a coolant pump other than an Evans pump the weep hole must be plugged.
It is possible for air to be drawn in to the pump through the weep hole and passed the bearing shaft seal. A small pipe plug or silicone will do the job.

Use of a 7 lb. cap on “waterless” system is recommended for racing, street rod and performance enhanced vehicles. For applications where 7 lb. cap is not available, standard cap may be used. All stock – factory original computer controlled daily driven vehicles are coolant change only – no system changes are required.

Install hi performance aluminum tube radiator.
Remove the thermostat and plug all bypass hoses.
Install heater shut off valve.
Increase the pump drive ratio with a smaller pump pulley.

Convert the upper hose and thermostat housing to 1 3/4”OD.
Two -16 AN lines minimum upper hose size.
Install external lines from the rear of the manifold, bigger is better, line size should be -12 AN.
For intake manifold fill location use #E3340 Expansion tank.
Use maximum pump drive ratio possible 80% of crank rpm or more.
For safety reasons all overflow hoses must be connected to an overflow tank or catch can.

INSTRUCTION INFORMATION

COOLING SYSTEM MUST BE DRAINED COMPLETELY, RADIATOR, BLOCK, HEATER!
Let the engine cool, set the heater control on maximum, and open the radiator drain. As soon as the expansion tank is empty, remove the radiator cap. On vehicles with block drains, remove the drain plugs and break through any sediment, which may be blocking the drain. Inspect drained fluid for rust and scale, if found flush as required (See Flushing and cleaning). For vehicles without block drains, remove the lower radiator hose at the radiator, remove the radiator drain cock and elevate the vehicle as required to drain the system To insure complete removal of old coolant, flush with Evans PREP fluid, or use the hot-purge procedure.

CAUTION: Ethylene glycol is poisonous. Do not leave it in an open container. Always use a drain pan to capture all fluid in compliance with local, state and federal laws. If drained fluid contains ETHYLENE GLYCOL, it must be disposed of as HAZARDOUS WASTE.

All water and remaining coolant must be removed from the system prior to installing EVANS “Waterless” Coolants. The engine and system must be completely drained, if necessary, use Evans PREP Fluid as a flush, or use the hot-purging technique for residual water. When converting older systems a chemical flush should be used to clean the system prior to flushing and installing Evans “Waterless” Coolants.

To insure that all residual coolant is evacuated from the heater core, disconnect both heater hoses at the engine side of the heater, lower one hose into a drain pan and very gently introduce air into the other hose until fluid is fully drained. It is advisable to pour the EVANS PREP fluid, into the higher of the two heater hoses until it visibly flows from the draining hose in order to flush out old coolant.

THE BLOCK MUST BE DRAINED! The system completely empty and as clean as possible.

NEVER work on a conventional hot pressurized water/antifreeze cooling system.

• Drains are ¼” pipe plugs removed with a ¼” drive square ratchet.
• Driver side drain is 3” from rear of block and 2” above oil pan rail.
• Passenger side drain is 4” from rear of block and 2” above oil pan rail. (Clearance is tight with starter. If necessary remove 2 starter bolts and let hang to remove drain.)

• If equipped with rear heater or heater control valve, disconnect lines at firewall and blow out.

Drain complete system, including radiator - engine block - heater circuit (gently blow air through heater circuit).

Drain and flush the entire system including the block and heater. By removing hoses and opening drains.

Remove radiator cap.

Unexpected loss of coolant: In the event of a highway emergency resulting in a coolant loss, NEVER ADD WATER. If EVANS “Waterless” Coolants is not locally available, temporarily top off the system with propylene glycol antifreeze (ie; Sierra, Prestone LowTox brand), and be sure not to add water. When EVANS “Waterless” Coolants is available, the temporary coolant should be completely drained and the system refilled, preferably within 15 to 30 days.

Coolant temperature “Spikes” in cold weather with NPG: During periods of extreme cold weather (10° F or below), some engines have a tendency to run at elevated temperatures at idle, 250 °F to 260 °F, and then return to normal levels when the vehicle is underway. In most cases the problem is due to an inherently large thermostat bypass circuit allowing the coolant to bypass the radiator through the open circuit at slow pump speeds. Or also caused by a restriction in the radiator and/or a very inefficient coolant pump, both of which result in reduced coolant flow when the coolant becomes more viscous in extremely cold weather. (NPG+ is recommended for cold weather use, NPG+ is less viscous of NPG.)

Although not detrimental to the engine, the situation can usually be corrected by blocking the thermostat bypass (usually located at the pump), removing the OE thermostat and installing an EVANS Total Flow Thermostat. Alternately, if available for your engine, an EVANS “Waterless” coolant pump may be installed. Evans pumps have blocked bypasses and more efficient pump impeller.

Expansion tank does not return coolant to engine: The cause is usually traced to a vacuum leak somewhere in the system, or that the system was opened (radiator cap removed while coolant was hot and not closed again during “cool down”). Since vacuum draw on the coolant in the expansion tank is the only way coolant is drawn back into the system, any air leak, no matter how small, will cause the engine to draw back in air rather than coolant and the coolant to remain in the expansion tank. If you find a need to add coolant to the radiator after each “cool down” and the expansion tank level keeps rising, then a leak exists and must be found. Check all clamps and tighten as necessary. Or apply a vacuum tester to the vent line where it attaches to the tank to locate the leak.

Engine runs hot at all speeds and loads: The engine heats up quickly while the radiator and heater hoses are still cold. The most common cause is an air locked pump. Install a bleeder valve in the pump or an Evans Full Time Bleed Line from the pump to the thermostat housing. Evans pumps are supplied with the bleeder already installed. If the engine still runs hot, the cause is usually inefficient pump, restricted radiator flow or poor airflow to the radiator. (See system requirements)

EVANS “Waterless” Coolants gradually change to a darker color during use due to organic aging from heat cycles in the engine. This change has no effect on the performance of the coolant, which normally will operate for at least 100,000 miles before requiring replacement.

Tests show the normal “life expectancy” of EVANS “Waterless” Coolants to be a minimum of 100,000 miles in a non-pressurized EVANS “waterless” Cooling System. Since the coolant naturally absorbs moisture from the atmosphere, if drained for any reason, store coolant in a tightly capped container for re-use.

If the vehicle is to be stored for a long period of time fill the radiator to the top with NPG and install the radiator cap. On a zero pressure system also seal the overflow hose. This will keep air and moisture from entering the cooling system, protecting the system from corrosion during storage.

Evans Cooling Systems Inc. warrants Evans Cooling Systems products to be free from defects in material and workmanship under normal use and if properly installed for a period of one year from the date of purchase. If found to be defective as mentioned above, it will be replaced or repaired if returned prepaid along with proof of date of purchase. This shall constitute the sole remedy of the purchaser and the sole liability of Evans Cooling Systems Inc. to the extent permitted by law, the foregoing is exclusive and in lieu of all other warranties or representations whether expressed or implied, including any implied warranty. In no event shall Evans Cooling Systems Inc. by liable for special or consequential damages.

Any Standard Evans Cooling Systems Inc. products may be returned by the original purchaser within 30 days from the date of purchase, for a full purchase price refund, if the item is returned in the original unaltered condition. The customer must call to obtain a return authorization and return freight must be prepaid. A copy of the invoice and a letter of explanation including name, address and phone number must be enclosed with the return. After a return item is received and inspected at Evans Cooling Systems Inc. a credit or refund will be issued. Any products, which have been modified or damaged by the customer, will not be accepted for return. There are no returns on any special order or custom items. Items returned after 30 days will be subject to a restocking charge.