overheated transmission

[redorchestra]

has anyone had problems with overheating their transmissions with grill blocks? I think i may have overheated the kitten's (my car) transmission. Now the transmission is slipping and searching for gears then slamming back into gear.

[SlideWRX]

Is it all gears? you usually loose one gear or sometimes two seemingly unrelated gears, due to a clutch or band going bad and starting to slip.

If, once it finds the gear, it stays there without issue, it may be something in the valve body, like contamination causing a valve to stick.

Being in Canada, I wouldn't expect you to manage to overheat the trans unless towing or loaded to the limit quite often.

[Cd]

I have an automatic transmission 1993 Civic that now has transmission problems.
I made a habit of LOW SPEED engine on coasting in neutral.

At anything below 45 mph the engine would always have to rev high to match the transmission.
Above 45 mph, the transmission and engine matched seamlessly .

The transmission now works fine until around 14 miles when it warms up. Then the speedometer stops working as well as the odometer. The car won't shift into high gear and the mileage drops to mid twenties versus mid forties.

When using a grille block the transmission warms much faster .

Not sure if I just have s bad transmission or if there is a connection.

[RobbMeeX]

I'd search for common problems related to the focus before blaming the grill block. External cooler or in radiator cooler?

[user removed]

Originally Posted by Cd

I have an automatic transmission 1993 Civic that now has transmission problems.
I made a habit of LOW SPEED engine on coasting in neutral.

At anything below 45 mph the engine would always have to rev high to match the transmission.
Above 45 mph, the transmission and engine matched seamlessly .

The transmission now works fine until around 14 miles when it warms up. Then the speedometer stops working as well as the odometer. The car won't shift into high gear and the mileage drops to mid twenties versus mid forties.

When using a grille block the transmission warms much faster .

Not sure if I just have s bad transmission or if there is a connection.

Sounds like a bad speed sensor if that model does not have a cable driven speedometer.

regards
Mech

[Frank Lee]

On the grill block I made for an a/t vehicle I left a hole in it right in front of the trans cooler. Transmissions and excess heat do not get along.

[mcrews]

I added a transmission oil cooler and additional fans (9" & 7")




also installed a trans oil temperature guage:


all of this sitsas low as possible in front of the radiator. it is in the flow of the lower grill opening which is not blocked

lower frill is open:


The gauge is digital, cost about $30. works nicely

[Grant-53]

Does the trans fluid look or smell different?

[Cd]

Originally Posted by Old Mechanic

Sounds like a bad speed sensor if that model does not have a cable driven speedometer.

regards
Mech

If you mean a Vehicle Speed Sensor ( VSS ), I replaced that part already.


The transmission seems to work fine untill it warms up, then the speedometer and odometer both die.

Fluid level is fine and not burnt smelling. I tried replacing the filter to the transmission, but this generation of Civic does not have a serviceable filter for the transmission.

Should I start a dedicated thread ? Or if you feel up to it perhaps you can PM me OldMech.
You were helpful once before in the past when I needed advice on the car.

[RobbMeeX]

You KNOW burnt smelling fluid! It is one of the worst smells!