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It is an involved procedure. Get a manual on your car from the parts store or AUTOBOOKSONLINECOM

Mcgyver331 added:

This is no fun I am doing this as I am writting today.

First you have to remove the dash. There are various 10mm bolts and Philips head screws.

There are wiring clips on the radio, the headlight switch (there is a button in the rear of the headlight switch to remove the switch rod)and on the gauge panel for easy removal.

Edit: Remove the passenger side seat and it will be much easier to remove the 'dog house' / engine cover. You will also have an easier time getting access to everything. This is also an excellent time to do that tune up you've been putting off as the engine will be easily accessible for plugs, wires etc. When I replaced my heater core I did not have to entirely remove the dash - it can be held up & out of the way with bungie cords. If at all possible, replace the heater core with a COPPER unit (hard to find) rather than the aluminum cores. If you have voltage leakage in the system, it will cause a dielectric reaction & eat up the new core in time. (Yes - voltage leakage! Test w/ a digital voltage meter from battery ground to the antifreeze in the radiator neck. Should read 0.01 or less on low dc voltage scale. Higher indicates a probable bad ground on a component somewhere which is finding a path to ground through the coolant.) /Edit

Edit: In my work van - I took a dremel tool with a cutting disc and cut along the "seam" on the passenger side of the dash. This eliminated any need to pull anything on the driverside dash and turns this into an hour job once the cut is made. Keep in mind - this was done in a work van but it does not look horrible if you take your time. A conversion, or "dressy" van owner might not favor this solution but for those of us with work, utility vans... it's a no brainer - do it! There is actually a faux "seam" cast into the dash plastic where that part of the dash may have been intended to be removable( until it was discovered how easy it makes heater core repairs). If you do this - there are only a few screws to remove & then you can access the heater core a LOT easier. /Edit

Then I would suggest you remove the internal engine cover for easier access. That takes a 1/2in. socket. There are 2 hoses to the left side of the engine bay. You can see those clearly if you remove the air intake rubber duct. The upper hose has the heater control valve on it and the lower one is a return line. These will need a flat head screwdriver or a 10 mm socket to remove the hose clamps.

I am right now trying to remove all the corresponding duct work to free up the heatercore box.

I removed all the duct work, then I found that there are a few bolts that go through the firewall to the a/c box on the engine compartment side. remove the 3 nuts and there is one bolt on the inside right hand side. There is a bracket that holds the dashboard bottom remove that also with 1/2in or 13mm.

Finally the heater box can be removed. you need a 1/4 in socket to split the heater box. there are like 15 little bolts for this. once the box is split you will finally see if the heater core is bad.

I started at this point to split all the duct work in half and clean it with bleach. Once that was done I replaced everything.

work slow if you rush disasters with wiring and vaccum hoses can occur.

thanks for reading

Can you send me a picture as I had a mechanic do my core, and you guessed it, I get no heat..As my upper hose has no control valve on it, it comes right from the radiator to the core, thanks for your help.My eail is

Edit: Be sure the correct hose is fed to the correct heater core port - they are two different sizes on mine so it should not be easy to mix them up but someone with an ambitious nature may have forced the 5/8" hose onto the 3/4" port. A mechanic I spoke to some years back (who observed me doing my first core replacement) mentioned that if the hoses were swapped the heater would not put out nearly as much heat. /Edit

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Q: How do you remove the heater core from a 93 Chevy G20 van with a 350 with air?
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