weird tranny fluid leak

I have a 94 Jimmy, 4.3 with the vin W, 4x4 and I have noticed tranny fluid coming thru my heater vent on the floor and it is also on my carpet on the passenger side below the dash. Where would this be coming from? Does my tranny lines run into my heater core? If so how do I go about changin my heater core? What is the easiest way? Thanx in advance

I have a 94 Jimmy, 4.3 with the vin W, 4x4 and I have noticed tranny fluid coming thru my heater vent on the floor and it is also on my carpet on the passenger side below the dash. Where would this be coming from? Does my tranny lines run into my heater core? If so how do I go about changin my heater core? What is the easiest way? Thanx in advance

Transmission fluid does not run threw heater.

But could be blowing out the filler tube and getting the fire wall.
Does it have the new style flipper type dip stick checker for transmission fluid?

IS THE TRANSMISSION HEATING UP OR SLIPPING?
Does a transmission capable scanner check show any codes or slippage?
The Main reasons for blowing out fluid.

Has the transmission ever been serviced?
Is the fluid level correct and the right transmission fluid used in it

I did notice that the vent tube has some fluid on it. It has the dipstick that flips over and locks. I just changed the fluid and filter about 600 miles ago. HaAVENT NOTICED ANY SLIPPING OR ANYTHING. And where my heater core is - well it kinda looks wet there. I didnt drive for 30 days and then I noticed it after I started driving it again

I did notice that the vent tube has some fluid on it. It has the dipstick that flips over and locks. I just changed the fluid and filter about 600 miles ago. HaAVENT NOTICED ANY SLIPPING OR ANYTHING. And where my heater core is - well it kinda looks wet there. I didnt drive for 30 days and then I noticed it after I started driving it again

To check the transmission you need to get it on a transmission capable scaqnner and check for transmission codes and slipage data and shift delay times and transmission tempt

Over heating from slipage is the main cause of throwing out fluid.
You may or may not be able to feel slipage just driving it.
Get it on a good scanner and check it out.
Post back any codes or slipage data.

do you know about how much it cost to have on checked?

do you know about how much it cost to have on checked?

You need to call your local repair shops.
Good diagnostic check and testing can run from 1/2 to 1 hr.

Beware of chain repair shops.
some are rebuild happy.

Check around Ask around
Word of mouth.
Family friends coworkers neighbors business people and delivery people.
Mailmen and parcel delivery people get around and notice a lot of stuff.
Even a good parts house knows what shops are good and not good.
Chamber of commerce and better business bureau and city hall.
If you find a good referral to a repair shop go look them over and talk to them.
Look for a clean looking busy place with nice people running it.
Ask a few questions and ask about their qualifications and training.
Not all places have trained tech/mechanics.
If they do not find a place that does.
Even all dealers do not have all trained techs/mechanics.

Let us know how it goes.

There is a vacuum switch on the transfer case with 3 lines connected to it. It is used for controlling the actuator under the battery. The actuator engages and disengages the right front axle shaft for 4WD operation. The vacuum system for the HVAC system uses the same reservoir and vacuum supply. If the seal inside the switch leaks, manifold vacuum will suck transfer case fluid into the vacuum lines for the 4WD and the HVAC system and into the vacuum reservoir. If that turns out to be the problem, ALL of the vacuum lines and actuators for the 4WD and the HVAC system must be cleaned out or replaced. Common symptoms are sluggish operation of the 4WD actuator and blend doors in the HVAC system causing improper air distribution through the ducts.

Check the transfer case fluid level, if it's low, the vacuum switch is probably leaking internally. (The transfer case uses automatic transmission fluid on your vehicle.)