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- The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=12)

- - Heater core (https://67-72chevytrucks.com/vboard/showthread.php?t=757944)

KQQL IT

02-25-2018 07:14 PM

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?

MYTQUIK

02-25-2018 09:36 PM

Re: Heater core

YouTube has many videos on install.

95 S_Trucker

02-25-2018 10:24 PM

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.

Kudzupatch

02-25-2018 11:15 PM

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.

KQQL IT

02-25-2018 11:24 PM

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

KQQL IT

02-25-2018 11:57 PM

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.

95 S_Trucker

02-26-2018 06:25 AM

Re: Heater core

Quote:

Originally Posted by Kudzupatch (Post 8197596)

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.

95 S_Trucker

02-26-2018 06:31 AM

Re: Heater core

Quote:

Originally Posted by KQQL IT (Post 8197650)

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.

95 S_Trucker

02-26-2018 08:19 AM

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.

Kudzupatch

02-26-2018 09:05 AM

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.

abig84

02-26-2018 02:36 PM

Re: Heater core

Quote:

Originally Posted by KQQL IT (Post 8197650)

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 (Post 8197811)

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

mountie

02-27-2018 06:35 PM

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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