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Jimmy Heater Module Removal

9 messages,  Last post on Jun 04, 2009 at 5:32 PM

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What is this discussion about? Chevrolet Blazer, GMC Jimmy, GMC S-15 Jimmy, Heating / Cooling, SUV

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#4 of 9 Re: 99 jimmy heater module removal [davidtc] by tburgess1 Sep 23, 2008 (4:09 pm)
Replying to: davidtc (Feb 15, 2008 1:30 pm) i have a 1998 jimmy ,and have to replace the heater core.CAN YOU HELP?EMAIL ME tburgess62yahoo.com
#5 of 9 1998 Jimmy cooling system by smitty36 Nov 19, 2008 (6:22 pm)
This is my first post so hope I'm doing it right. I had a coolant leak in my '98 Jimmy, had it pressure tested and was told water pump & radiator were leaking. I replaced radiator, water pump, heater hoses and radiator hoses & T-stat and refilled with regualr antifreeze as I had always used regular antifreeze (bought car in 2000). Later I find out GMC has this special anti freeze. (OK call me dumb) Heres the problem: This was done three years ago, I still have regular antifreeze in the system, I have been adding coolant about once per year and no apparent leaks & my heater blows cold some times and hot some times. I read thru some posts on here and wonder what kind of damage I've caused to my system by mixing the antifreeze? Heater core partially plugged from mixing antifreezes?. Thanks
#6 of 9 Re: 99 jimmy heater module removal [lrj78] by Mac558 Dec 02, 2008 (1:24 pm)
Replying to: lrj78 (Aug 09, 2007 7:03 am) I just replaced the heater core on my 2000 Jimmy. The repair manual from the auto parts store was no help. Before disconnecting power, move electric seats fully down and back for extra room. I saw no need to drain the coolant, since the core is higher than the rest of the system. There are several bolts holding the heat/vent module from the engine compartment side. One inside the a/c unit under the fan resistor panel, one about halfway down the a/c housing on the engine side, and the long torx bolt with a nut on it. I also broke the tabs on either side of the inside bolt and caused no harm. Use two people if possible to remove the dash. I caused a little damage to my instrument panel glass (plastic) and radio knobs. Replies to this message: mberube (Dec 29, 2008 10:10 am) tkeo (Jun 04, 2009 5:32 pm)
#7 of 9 Re: 99 jimmy heater module removal [Mac558] by mberube Dec 29, 2008 (10:10 am)
Replying to: Mac558 (Dec 02, 2008 1:24 pm) Would you recommend this same process for a 2001 jimmy?
#9 of 9 Re: 99 jimmy heater module removal [Mac558] by tkeo Jun 04, 2009 (5:32 pm)
Replying to: Mac558 (Dec 02, 2008 1:24 pm) Do you have to remove the whole dash to do this? Can’t do it from underneath? I’m trying to fix my 96 jimmy…

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