{"nhtsa_id":37844,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1995-01-11","date":"1994-11-01","document_id":"461102","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:COOLING SYSTEM","mfr_system":null,"summary":"INSUFFICIENT HEATER PERFORMANCE. *TW","document":null,"url":"https://open.wenmarpro.com/bulletins/37844","components":[{"id":"engine","name":"Engine","parent":null},{"id":"cooling-system","name":"Cooling system","parent":"engine"}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"G SERIES","year_from":1990,"year_to":1994,"match":"exact","vehicle_ids":["1990_chevrolet_g-series","1991_chevrolet_g-series","1992_chevrolet_g-series","1993_chevrolet_g-series","1994_chevrolet_g-series"]},{"make":"GMC","model":"G SERIES","year_from":1990,"year_to":1994,"match":null,"vehicle_ids":[]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}