98 Sonoma heater core


Old 09-10-03, 08:48 AM
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98 Sonoma heater core

What's the correct way to access the heater core in a 98 GMC Sonoma??? 2WD, X-Cab, factory air, 4.3L V-6
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Old 09-10-03, 09:30 AM
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Check autolibrary.org below for R&R instructions.

Failing that, check your library for a manual, purchase a $25 Alldata.com subscription or pick up a factory manual to guide you.
Old 09-10-03, 09:30 AM
darrell McCoy
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Auto library has a decent description of this procedure. A PITA.
Old 09-10-03, 07:30 PM
billys68ss's Avatar
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Location: USA
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Unfortunately this is not one for someone with limited mechanical skills (not saying that applies to you). Alldata says that the heater core pays 4.6 hours without A/C. With A/C it is 8.0 hours. Im sure this is because you have to evacuate and recharge the A/C system. If you have a floor shifter add another .3 hours. This procedure requires that the instrument panel be removed.
Let me know if you want the procedure from Alldata and I will try to make it available to you. Unfortunately Alldata does not allow me to copy and paste so I either have to type the procedure in or find another way. I could fax it to you if you have a fax number (preferable a toll free number as for some reason we do not have long distance at the shop yet)
Hope this helps ya,

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