Quote:
Originally Posted by cpeter38
I'm considering getting one, but I cannot find any direct data on whether there is a pump in it (I believe there is, but it is darn hard to prove it) or what the temperature cutoff is. I did find the following: link1, link2 (go to page 71-73 on link 2).
Anyone compare fuel economy numbers at 70F? |
I gave the company a quick ring, and there is no pump on them. They rely on the natural convection of the coolant.
I'm sure the thermal overheat protection is just for their unit and/or rubber hoses connected to them.
In winter, I can't say for sure what the fuel economy impact is, but it seems to be decent. I think the first time I started using it on my Matrix I saw roughly a 2-3 mpg increase. The previous tank or two was around 31-32, and after that I saw 33-35. I can't comment on summer, but it would make sense that the penalty for not using one isn't quite as large.