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Old 02-25-2018, 07:14 PM   #1
KQQL IT
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Heater core

My 1999 ccsb 7.4 4l80 Lost the heater core today.

Read up a bit one way says 30 minute job, one said 4 hours any real life advice?
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Old 02-25-2018, 09:36 PM   #2
MYTQUIK
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Re: Heater core

YouTube has many videos on install.
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Old 02-25-2018, 10:24 PM   #3
95 S_Trucker
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Re: Heater core

The dash has to come out. Book time is 5.5 hrs. Ive had the dashes out of these trucks. It's not hard, just time consuming.
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Old 02-25-2018, 11:15 PM   #4
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Re: Heater core

99 must be quite different than 93? I did my old PU and was quite surprised at how easy it was. Been a while but I am sure it wasn't more than an hour and a half. Hardest part was removing the hoses.
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Old 02-25-2018, 11:24 PM   #5
KQQL IT
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Re: Heater core

That's why I was asking.
One said 30 minutes tops one said 5 hours.
Trying to decide to farm it out or do it myself
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Old 02-25-2018, 11:57 PM   #6
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Re: Heater core

Here is what I'm going to try.

https://youtu.be/zBOj0I6_wpw

Whole dash pfft
6 screws
2 clamps
2 new heater hose because I cut and looped mine to get home.
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Old 02-26-2018, 06:25 AM   #7
95 S_Trucker
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Re: Heater core

Quote:
Originally Posted by Kudzupatch View Post
99 must be quite different than 93? I did my old PU and was quite surprised at how easy it was. Been a while but I am sure it wasn't more than an hour and a half. Hardest part was removing the hoses.
The dashes changed in 95.
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-62 Lincoln Sedan 430 Auto
-61 Lincoln Convertable, 430 Auto


85 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=368864

78 Big10 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=383629

96 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=614515
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Old 02-26-2018, 06:31 AM   #8
95 S_Trucker
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Re: Heater core

Quote:
Originally Posted by KQQL IT View Post
Here is what I'm going to try.

https://youtu.be/zBOj0I6_wpw

Whole dash pfft
6 screws
2 clamps
2 new heater hose because I cut and looped mine to get home.
Maybe I'm wrong. The last truck I did the heater core and the a/c core at the same time.
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-99 K2500 LS CCSB 7.4
-96 C3500 HD 7.4 NV4500 Rollback
-85 K10 5.7 700r4
-78 K10 5.7 4 Speed
-90 ZR1 5.7 6 Speed
-62 Lincoln Sedan 430 Auto
-61 Lincoln Convertable, 430 Auto


85 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=368864

78 Big10 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=383629

96 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=614515
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Old 02-26-2018, 08:19 AM   #9
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Re: Heater core

I did a little research. Some trucks have an access panel in the HVAC housing to reach the heater core with out taking the HVAC housing out of the truck.

My 96 C3500HD has that access panel. My 99 K2500 does not.

My 96 was built in Janesville.
My 99 was built in Flint.
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-99 K2500 LS CCSB 7.4
-96 C3500 HD 7.4 NV4500 Rollback
-85 K10 5.7 700r4
-78 K10 5.7 4 Speed
-90 ZR1 5.7 6 Speed
-62 Lincoln Sedan 430 Auto
-61 Lincoln Convertable, 430 Auto


85 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=368864

78 Big10 Project: http://67-72chevytrucks.com/vboard/s...d.php?t=383629

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Old 02-26-2018, 09:05 AM   #10
Kudzupatch
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Re: Heater core

I know it is not the same year but that is the how my PU was. I think it was a 94, but it was a surprisingly easy job for a heater core. If you have the same access is really not a bad job.
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Old 02-26-2018, 02:36 PM   #11
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Re: Heater core

Quote:
Originally Posted by KQQL IT View Post
Here is what I'm going to try.

https://youtu.be/zBOj0I6_wpw

Whole dash pfft
6 screws
2 clamps
2 new heater hose because I cut and looped mine to get home.
Quote:
Originally Posted by Kudzupatch View Post
I know it is not the same year but that is the how my PU was. I think it was a 94, but it was a surprisingly easy job for a heater core. If you have the same access is really not a bad job.
thats how my 1990 is, i saw a access panel and tears almost came out of my eyes, after doing many newer s10s and others vehicles at work that take almost all day this was a blessing. took like a hour.

i think it was easier then even the old k5 blazers. those were pretty easy too but had to take off like 8 bolts then take the whole assembly to the bench
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Old 02-27-2018, 06:35 PM   #12
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Re: Heater core

In my '88 , It took me 4 hours the first time to loosen the dash...

Next time it took me 30 minutes.. you only have to raise the right side up, after loosening the hole thing. Man-o-man.... but it takes a lot of prying to get the heater core out
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