I posted elsewhere about changing my CVT fluid and CT cooler filter. I bought the 2008 Patriot with 142k miles on it. A service record reported the fluid and mesh filter above the transmission pan had been changed at approximately 122k miles, yet the CVT was seriously whining during warmer weather, and I had a few codes, including the CEL once. I swapped out the fluid and cooler filter at 144k.
I don't hear the whine any longer and the transmission seems to change the gear ratios continuously and smoothly. I believe this is how a CVT operates and any felt shifting is under rapid acceleration (downshifting) at higher speeds. I have also noticed that I now have a pronounced engine slowing as if drag is exerted by the CVT when I decelerate. This was not pronounced prior to the service. I read on these posts that folks feel a sensation of engine braking with the CVT's. Does any one know if this is engine braking or drag created by CVT? It is quite real and I feel as if this is more than engine fuel cutoff. I am curious.
I am also wondering that since I had to disconnect the battery cables, could this change my computerized driving style and create more drag from the CVT or engage the fuel cutoff sooner?
One last question - Has anyone replaced the valve cooler bypass? It feels to me that one of the "through lines" from beehive cooler is not as warm as the other lines. I wonder if the valve could be partially stuck closed or open. For $40 - $50, I could probably replace this before messing around with a external cooler pressure check.
I appreciate all of your collective experience and thoughts. Thanks.
I don't hear the whine any longer and the transmission seems to change the gear ratios continuously and smoothly. I believe this is how a CVT operates and any felt shifting is under rapid acceleration (downshifting) at higher speeds. I have also noticed that I now have a pronounced engine slowing as if drag is exerted by the CVT when I decelerate. This was not pronounced prior to the service. I read on these posts that folks feel a sensation of engine braking with the CVT's. Does any one know if this is engine braking or drag created by CVT? It is quite real and I feel as if this is more than engine fuel cutoff. I am curious.
I am also wondering that since I had to disconnect the battery cables, could this change my computerized driving style and create more drag from the CVT or engage the fuel cutoff sooner?
One last question - Has anyone replaced the valve cooler bypass? It feels to me that one of the "through lines" from beehive cooler is not as warm as the other lines. I wonder if the valve could be partially stuck closed or open. For $40 - $50, I could probably replace this before messing around with a external cooler pressure check.
I appreciate all of your collective experience and thoughts. Thanks.