Heater core installation 90 suburban

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Heater core installation 90 suburban

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Chevrolet Forums >> Chevy Trucks, Vans & SUV's >> Suburban >> Heater core installation 90 suburban

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Heater core installation 90 suburban - 11/23/2006 7:01:06 PM

usmc2037

Posts: 7
Joined: 11/23/2006
Status: offline

New to group: Thanks for any help anyone can offer. Have a 90 suburban just bought and am repairing. Has a leaking heater core. Searched the repair manuals, but not very helpful. Just need to basic steps to get to core. Appears to me that the evaporator cover under the hood has to be removed to get to the nuts that hold the case on under the dash. Can't find a way to get to it just from the inside. Do I have to disconnect the AC system in this process? Have several other problems, but want to take them one at a time.

Post #: 1

RE: Heater core installation 90 suburban - 11/24/2006 7:47:58 PM

Tommygunz

Posts: 52
Joined: 11/10/2006
Status: offline

I had to do this on my 87 as well..... to my recollection yes the box on the outside needs to come off to get to it, but the nuts are on the inside of the firewall, this is a very unfun procedure. Unfortunately it has been about 5 years since I did that and I cannot remember if I disconected my AC for that or if it was for another repair I was doing??? Sorry, I know its not alot fo help..

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2007 Dodge Ram QC "Big Horn" 5.9 CTD
2005 Dodge Stratus

(in reply to usmc2037)

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RE: Heater core installation 90 suburban - 11/24/2006 10:03:44 PM

70mopar

Posts: 248
Joined: 10/12/2006
Status: offline

no u don't need 2 touch the A/C 2 remove the heater core box (just did mine on my '90 'burb in July)

***** be XTRA careful when u split the box open 2 remove the core***** the pivot pin that holds the directional door in place (& controls the direction of the door), needs 2 b removed carefull, as the small brace inside (that is part of the box, therefor made of plastic & brittle), will snap off so easily if u try 2 force the pin out. take your time & spray some WD on it, 2 help it slide out easier. good luck.

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no replacement for displacement (8p

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RE: Heater core installation 90 suburban - 11/25/2006 12:34:20 AM

usmc2037

Posts: 7
Joined: 11/23/2006
Status: offline

Does the evaporator box in the engine compartment need to come off to get to the nuts for the core box? Thanks for the info.

< Message edited by usmc2037 -- 11/26/2006 12:17:56 AM >

(in reply to 70mopar)

Post #: 4

RE: Heater core installation 90 suburban - 11/26/2006 5:18:51 PM

usmc2037

Posts: 7
Joined: 11/23/2006
Status: offline

Well got it out and am well on the way to putting it back together. Plastic cable holder broke because the last person who worked on it over tightened it and cracked it so that when I removed the screw it just fell apart. Going to use a couple of zip ties to hold it in place. Also the end twisted off of one of the fire wall studs due to the stud part being bent. Plenty of stud left to push through firewall and put on new nut. Glad I didn't have to take the evaporator box apart that is located in the engine compartment. If anyone needs advice on the job, just let me know. Not as hard as some jobs I've done, but did take the better part of an afternoon.