Hello folks,

I'm glad to find this forum here and hope you can help.

My '98 Caravan (3L, 230k mi.) has had problems upshifting and has a rough 2-1 downshift shift since the weather has gotten warmer.

The first time I had a problem, I found the fluid level low. After adding, it immediately shifted better.

Now the problem seems to be coming back, and is worse especially after stop and go driving on a hot day.

Thanks in advance for your help.

 

Welcome to DF
You need to ck for transmission codes, and there maybe a transmission flash update for the problem you are having.

 

Thanks for the response.

After driving the car for a while and having the problem occur seemingly intermittently, I can make the problem occur by turning on the A/C.

Any further advice?

 

bump xxxxxxx

 

The A/C circuit should not cause a problem with the transmission. How ever the a/c pressure switch is on the same curcuit as the TPS and MAP/BARO sensor. You may need to have a co-pilot hooked up and record the shifting problems you are having.

 

Thank you for the thoughtful reply.
I thought it was weird to, but worth mentioning. Do you think my problem may be heat related since that's when I'm most likely to run the a/c?

 

bump .......

 

I don't think its the a/c. you could have a problem the u/d acuumulator spring or a valve sticking in the valve body.