Premium High Flow Water Pumps With A Racing Heritage And A Lifetime Gaurantee The 10 Most Frequently Asked Questions Q1 - Will a Cruise Cooler water pump reduce my coolant temperature? A1 - Usually...there are a lot of components in the cooling system. If the problem is elsewhere, installing the pump will not help. Take time to trouble shoot your system before purchasing a new water pump. Q2 - Will the Cruise Cooler pump out perform the Edelbrock pumps? A1 - The Edelbrock pumps look very nice if your not concerned with having an original appearance...but they don't perform better than the Cruise Cooler water pumps. Q3 - Do I need to run a thermostat and which kind is best? A3 - Street driven vehicles need a thermostat. Cruise Cooler offers the legendary Robertshaw high flow thermostats modified for high RPM applications. They are available in versions for colder climates and more moderate climates in 160, 180 and 195 degree ratings. Always replace the thermostat and radiator cap when installing a new water pump. Q4 - What pulleys do I need? A4 - Street driven vehicles need the water pump driven at crankshaft speed or overdriven by as much as 35%. Never run underdrive pulleys on the street. Race applications should drive the water pump at 6,000 to 6,500 RPMs. Q5 - My engine runs cool enough out on the highway but heats up while cruising or idleing. What is the problem? A5 - The water pump may not be moving enough water at low speeds. Rebuilt and new replacement pumps seldom perfrom as well as the OEM pump your car had way back when. The Cruise Cooler pumps flow more at low speeds than the OEM pumps and a ton more than standard replacement pumps. Q6 - What is the best coolant to use? A6 - Water cools best. We have found no merit to the claims of the "snake oil" merchants. If freezing is a concern, use the least amount of antifreeze you can for your climate. If freezing is not a concern, use water with an additive such as Prestone. Q7 - Aluminum or Copper? Which radiator cools best? A7 - Aluminum radiators are superior. Copper has a better thermal conductivity rating, but they must be assembled with solder....which acts as an insulator between the tubes and the fins. Q8 - What size radiator should I use? A8 - Always use the radiator with the largest surface area. Thickness is good, but surface area rules. Single pass cross-flow radiators are the preferred configuration. Q9 - What radiator cap should I use? A9 - Always use the highest PSI cap reccomended by the radiator manufacturer...and always replace the cap and thermostat when installing a new water pump. Q10 - Electric fans or mechanical? A10 - Modern electric fans out perform mechanical fans on all applications except towing and gasoline fueled dirt oval track racers.