98 honda civic, when the car is D4

Time for a rebuild.

Check all trans sensors if it’s high mileage and fluid has not been changed regularly then you can bet a complete $2,000-$3,500 rebuild is due!

d4 light on means there is a trouble code stored in the trans computer. will need to pull codes to diagnose.

Would need more info on the heat/ac problem. But on the shifting problem check under the hood and make sure when the shifter is moved the linkage moves. If not the shift cable is most likely the problem, but check at the shifter to make sure.

I have a 1998 Civic HX 2DR as well and mine also takes a moment to engage when you press the gas. I don't know if this is normal or not? I just bought the car and I need to replace the trans fluid only because I don’t know if there is Honda oil or another brand in it. The CVT transmissions only can use Honda's CVT oil. There is a recommend alternative oil but based on the manual it’s only for temporary use until you can replace it with the Honda oil otherwise it will cause damage to the transmission over time.

D4 is drive with over drive when overdrive switch is press in/on position on shift. Good luck and thanks for using FIX YA

could be trans filter i would have it flused

overdrive may be worn out and u dont feel it shift or ur tranny is messed up

the shift points in the trans are electroniclly controlled if they are going bad witch is normally the case with the accord auto trans.you can either have the trans rebuilt or get a new one.

Honda transmissions,as well as most other overdrive transmissions,should be driven at all times in drive 4,or the overdrive position,with the exception of severe driving conditions,such as towing a load,extremely hilly terrain,or long uphill grades,the trans should be taken out of overdrive,and placed in the drive 3 position.This is to prevent the perpetual shifting back and forth of the trans from 3rd into 4th,back to 3rd,back to 4th,back to 3rd,that would eventually damage both the 3rd and 4th gear clutch discs and components.