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post #1 of (permalink) Old 01-03-2001, 10:18 AM
joeybcdt
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Replacing Heater Core

Anyone know how to replace a heater core in a 84 CJ7? I assume it's up underneath the dash on the passenger side. What all has to come out?

Thanks,
Joey

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post #2 of (permalink) Old 01-03-2001, 10:25 AM
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Re: Replacing Heater Core

Simple job, take about an hour. Just remove that big heater box, the bolts are on the firewall. Undo the hoses, take out the old core, put the new one in, put the box back in, and away you go. BTW, you may want to do the Chevy fan motor upgrade while there.

Brad
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post #3 of (permalink) Old 01-03-2001, 11:37 AM
 
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Re: Replacing Heater Core

I believe there are five nuts on the firewall, 1/2 inch. Starting near the battery, with the last right behind the valve cover. One change i did, the box is sealed with black goop similar to the stuff used to seal windshields in, i scraped the old goop off and used the foam weather stripping from Home Depot, 1/4 inch stuff. Makes it alot easier the if there is ever a next time. Pretty easy job though. Definitely do the blower upgrade!

Actually, I have a wrangler tub on mine, so i don't know if the process is the same on a CJ-7. Anyone?

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post #4 of (permalink) Old 01-03-2001, 11:40 AM
joeybcdt
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Re: Replacing Heater Core

Thanks Brad.

Can you tell me more about the Chevy fan motor upgrade? I haven't heard of that one.

Joey

post #5 of (permalink) Old 01-03-2001, 11:41 AM
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Re: Replacing Heater Core

Just a note: There are two screws that hold the heater core into the heater box. Make sure you have clearance for these. I had to replace a heater core prematurely due to these two screws rubbing holes into the core. When I replaced it this last time I put a couple washers under the head of the screws to give me a little more clearance.



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post #6 of (permalink) Old 01-03-2001, 11:44 AM
 
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Re: Replacing Heater Core

Search the old posts, i used a '73 Blazer motor with a/c, $17 at Pep Boys. You will have to enlarge the hole in the firewall a bit, a sawzall works well. The old grommet won't fit on the new motor. Again, you can use the Home Depot weather stripping to make a new seal.

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post #7 of (permalink) Old 01-03-2001, 11:57 AM
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Re: Replacing Heater Core

The Blazer motor comes in 2 flavors - short or long shaft. Get the short one (take your old motor to compare if possible). You will need to enlarge the hole in the firewall to 3 1/4". I will sell the hole saw I bought if interested. I also found that it was easier to pull the heater box out if I unscrewed the vent outside in front of the windshield.

post #8 of (permalink) Old 01-03-2001, 12:33 PM
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Re: Replacing Heater Core

Check out the website below for the heater core install. Was a great help to me. I also put the blazer motor in and it is real easy and straight forward. Take out the old, cut the hole a bit bigger an put in the new one. Just a bolt on really. Just make sure you cover the hole on the outside of the motor with tape or something...you'll know what I am talking about if you get the motor Hope this helps.

http://www.jps.net/todherman/heater.htm


post #9 of (permalink) Old 01-03-2001, 02:08 PM
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Re: Replacing Heater Core

Joey, I'd also suggest taking apart the whole heater box and refurbishing it while you have it out. You should be able to buy gasket material at the hardware store to repalce all the foam that's dried and flaking apart inside the box.

I'd reccommend that you enlarge the hole to 3 1/2 inches. This gives a little slop room, also enlarge the motor hot lead connector hole.

I also found it easier to take out the front passenger seat to have a little more room to work.

Here's an easy way to enlarge the hole in the firewall.

1. Make a 3 1/2" circle out of heavy cardboard.
2. Center the carboard over the existing hole.
3. Using a good heavy black marker, trace the outline onto the firewall.
4. Remove the cardboard.
5. Get a hacksaw blade and wrap some duct tape around one end to cushion it.
6. Draw lines from the edge of the hole to the edge of that black line you made in step 3. Make the lines about 1" apart.
7. Using the hacksaw, just saw down the vertical lines to the outline mark
8. Using a small pair of vice grip pliers, clamp them onto one of the peices of 1" metal, between the cuts made in step 6.
9. Work the plieres forward and back, you'll fracture the metal and can remove it.
10. When you've removed all the metal dress up the hole with a drill mounted grind stone.
11. Prime and paint the edges of the hole to prevent rust.

Safe Jeepin'

Larry
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