How do you replace the evaporator core for the a/c? on a 1994 gmc p/u truck, I've already have the dash out having promblems removing the duct work, what's next? or is there a maunal that will show me.

SOURCE: 1994 gmc jimmy steering wheel removal

Gently pop off the horn cap / cover.

There will be a short wire attached, so be careful not to pull it too hard.

You will see the wire going into the metal frame of the steering wheel.

The wire will go into a "sleeve". Push the sleeve in, and turn slightly counter-clockwise to unlock the connector. The horn will beep a few times as you pull the wire out, just to warn you :)

You will now need a steering wheel puller. These can be bought for about $10 at any auto parts store.

Once the wheel itself is off, you will see a black plastic disk. remove it. Now you will see a metal disk with notches in it (this is what locks the steering wheel when you turn the key off). You may want to get someone for assistance for this one, as there is a pretty stiff spring behind the disc, so use caution. You will need to push the disc towards the dash and remove the retainer clip.

Once that is off, you will see the white turn signal switch. Remove the hazard switch button first, then the turn signal lever retaing screw (be careful if it has cruise control, as the wires are thin and delicate), then remove the 3 phillips head screws holding the actual switch on. Let the switch hang out of the way.

Now, you'll see the lock cylinder retaining screw. This is where you may have a problem if you don't have a key.

After removing the screw, you MUST turn the ignition switch to the "run" position and pull out the assembly.

SOURCE: NEED TO REMOVE DASH TO

yes you have to remove the whole dash assambly to replace the heater core..have fun i had to do mine twice.my new heater core lasted about 6 months.

Dana Newcombe

• 1564 Answers
• Posted on Oct 04, 2009

SOURCE: Replacing heater core in 2000 GMC sonoma. Dash is

If the dash is removed you've saved about 9 10ths of the job endurance. Look around, what you believe to be, the perimeter of the heater box. I cannot, and no one else can, tell you exactly where the bolts and nuts that mount the heater box are. Therefore you must viually sixe the box and check outide in the engine compartment and inside under the dash for the mounting bolts.You'll want to start by removing the heater hoses. Then starting at the passenger side engine compartment look for a group of 10mm or 7/16ths nuts retaining the housing and remove them. Do the same inside. The housing is usually held together with screws or clips, it changes year to year. Keep a log or pix of the wires and cables and hoses(vacuum) that are connected to the housing for reassembly. You'll need to "roll" the box out from under the dash depending on how much of the dash has been removed. The core is easy to spot for is has two hoses sticking out, and, is encircled with clips or screws . Also make sure you remove the bracket around the two entry hoses if it has one. Thank you, Dana