{"id":15516,"date":"2021-10-30T11:46:28","date_gmt":"2021-10-30T15:46:28","guid":{"rendered":"https:\/\/gm-techlink.com\/?p=15516"},"modified":"2021-11-08T11:48:53","modified_gmt":"2021-11-08T16:48:53","slug":"insufficient-heating-performance-due-to-exhaust-manifold-outlet-pipe","status":"publish","type":"post","link":"https:\/\/gm-techlink.com\/?p=15516","title":{"rendered":"Insufficient Heating Performance Due to Exhaust Manifold Outlet Pipe"},"content":{"rendered":"<p>Some 2020-2021 Encore GX and Trailblazer models equipped with the 1.3L turbo engine (RPO L3T) may have insufficient heat or no heat in the cabin after driving for several minutes.<\/p>\n<p>During diagnosis, GDS 2 Engine Cooling and HVAC Data may show that the temperature difference between the heater inlet (ECT sensor 3) and heater outlet (ECT sensor 4) is over 30\u00b0C (86\u00b0F) when the engine is warmed fully. If this temperature difference between the heater inlet (ECT sensor 3) and heater outlet (ECT sensor 4) is found, use a general boroscope to check for a blocked exhaust manifold outlet pipe. (Fig. 9) Allow enough time for the engine cooling system to cool before opening.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15488\" src=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2021\/11\/F09-exhaust-1.png\" alt=\"\" width=\"738\" height=\"480\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2021\/11\/F09-exhaust-1.png 738w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2021\/11\/F09-exhaust-1-300x195.png 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2021\/11\/F09-exhaust-1-85x55.png 85w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2021\/11\/F09-exhaust-1-200x130.png 200w\" sizes=\"auto, (max-width: 738px) 100vw, 738px\" \/><strong>Fig. 9<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>An internal blockage of the exhaust manifold outlet pipe may result in insufficient heating performance. If the pipe is blocked, replace the pipe. (Fig. 10) Refer to Exhaust Manifold Outlet Pipe Replacement in the appropriate Service Information.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-15489\" src=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2021\/11\/F10-exhaust-2.png\" alt=\"\" width=\"740\" height=\"480\" srcset=\"https:\/\/gm-techlink.com\/wp-content\/uploads\/2021\/11\/F10-exhaust-2.png 740w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2021\/11\/F10-exhaust-2-300x195.png 300w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2021\/11\/F10-exhaust-2-85x55.png 85w, https:\/\/gm-techlink.com\/wp-content\/uploads\/2021\/11\/F10-exhaust-2-200x130.png 200w\" sizes=\"auto, (max-width: 740px) 100vw, 740px\" \/><strong>Fig. 10<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>After the new exhaust manifold outlet pipe is installed, run the engine to raise the engine coolant temperature and check the GDS 2 Engine Cooing and HVAC Data menu. The temperature of the heater inlet (ECT sensor 3) and heater outlet (ECT sensor 4) should be similar.<\/p>\n<p>For additional information and part numbers, refer to Bulletin #21-NA-223.<\/p>\n<p>&nbsp;<\/p>\n<p><em>&#8211; Thanks to Frank Jakubiec<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Some 2020-2021 Encore GX and Trailblazer models equipped with the 1.3L turbo engine (RPO L3T) may have insufficient heat or no heat in the cabin after driving for several minutes. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[97],"tags":[],"class_list":["post-15516","post","type-post","status-publish","format-standard","hentry","category-2021-october-b"],"_links":{"self":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/15516","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=15516"}],"version-history":[{"count":1,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/15516\/revisions"}],"predecessor-version":[{"id":15517,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=\/wp\/v2\/posts\/15516\/revisions\/15517"}],"wp:attachment":[{"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=15516"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15516"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gm-techlink.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15516"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}