Best Answer

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

User Avatar

Wiki User

2011-09-13 06:23:02
This answer is:
User Avatar

Add your answer:

Earn +5 pts
Q: How do you remove the heater core from a 93 Chevy G20 van with a 350 with air?
Write your answer...

Related Questions

Heater core replacement for a 1990 ford e-350?






How do you remove heater core for 1995 F 350?





how do I change the heater blower on a f350 2002



Where is the heater core on a 1981 Chevy Corvette 350 auto AC?

In my experience the heater core is by the passenger seat. There is a web site that may be able to help you out more. Let me know if this helped you out.



What is the vacuum valve on the return side of the heater hose on a 69 Chevy 350 for?

That is called a heater control valve. When you are not using your heater, vaccume closes a small valve that's in the control valve and stopes the water from going through the heater core. Therefore you get no heat inside of the cab.



How do you tell if the heater core is leaking on 1980 Chevy 350?

They usaually fog up the inside of the windshield when defrost is used, soak the pass side floor with coolant and smell of anti freeze when operating heater in any mode.





What are the heater hose sizes on a 1978 Chevy 350?

5/8" and 3/4"



How do you remove the valve cover on a 96 Chevy 34 silverado?

if its a 350 remove alt. first

How do you remove the heads on a Chevy 350?

take out the cylinder head bolts

Where is the heater valve on a 1988 Chevy truck?

The heater valve is in line in the heater hose from the top back of the 350 engine about half way to where it enters the firewall to connect to the heater core. The valve has a steel wire control cable connected to the top of the valve control lever. It has two hose connections, one in from the engine and one out to the firewall core entry point. Trace your heater hoses and look for the metal valve with the spiral covered control wire.

How do you replace a heater core on a 1993 Suburban 1500 350?

You remove the bottom panel of the heater box under the passenger side dash. It is about 6 or 7 screws. Once the panel is off you will see the heater core. It has a clip at the top you loosen. You must remove the 2 hose clamps in the engine compartment before it will come out. The new ones usually do not come with the foam padding on top of the core. Use some RTV or spray glue and carefully pull it off of the old one, and put on the new.

How do you change a heater core in a 1994 Chevy z-71 4x4 350 motor?

In a 1988-1994 Chevy/GMC truck, replacing the heater core involves disconnecting the coolant hoses at the lower passenger side of the firewall from the engine compartment. Then remove the bottom cover off of the vent system on the passenger side (this will be directly above and slightly to the left of the passengers feet if they were sitting in the truck). There are at least 4 screws (possibly more) that secure this cover; be sure and remove all of these screws before trying to take it off. With the cover off, you will see the heater core directly above the cover. There is one retaining clip that is screwed into the ducting towards the top of the heater core. Putting everything back together is as simple as reversing these steps. Be sure to top off your coolant after you're done (while running, you'll need to clear the air out of the coolant system).

How do you change a Chevy 350 flywheel?

remove the enigine and then take out flywheel bolts



How to change a head gaskets 1992 Chevy 350?

Remove the cylinder head from your 1992 Chevy 350 cubic inch engine. Remove the head gasket and clean the surface. Put the new head gasket on and reverse the process.

How do you change a heater core in 1989 Ford F-350 diesel?

remove the glovebox you will then see a black box that has a cover that is held on by 10mm head screws take that off. then go under the hood to the passenger side the two hoses that come out of th firewall are the heater core in and out lines take the hose clamps off. Go back into cab pull old heater core straight back and its out. go in reverse order to install new