Engine Hot A/c Turned Off

luap1980 · February 28, 2008

2008 sierra 5.3 flex fuel. I got a display on my dash saying "engine hot a/c turned off" on my way home from work. When I saw this I pulled over and stopped turned off my engine (the fan was running steady) then I checked my coolant, which was good, and made sure the engine was not steaming, . At this time my temp. gauge was also not working. Now the truck won't start. The temp. outside was -12 C . Before I left work I let the truck warm up (the temp. guage was working then). I left the truck overnight and went back and it is still displaying "engine hot a/c turned off" message. Any ideas?

houdini29 · March 11, 2011

Have it towed to the dealer and let your warranty work. Mark.

Well taking it to a dealer would have been my first thought but since I bought my truck in the U.S. and I live in Canada my warranty does not kick in untill after 6 months/ 7500 miles but I saved $12000. Man are dealers in Canada gouging Canadians or what? Anyways, I found my problem was my block heater cord!! I had cut the thermostat "tumor" off the end of my cord so that the cord was operational above 0F/-18C. That night it was only -12C so I guess it tripped A sensor. A GM mechanic said he has seen stuff like this before if the cord is cut the truck gives out error codes when nothing is wrong.

Yea i think have the same problem..... I re wired the block heater cord couple days ago... and pluged in every night and it was warm last night and got a message saying engine hot ac turned off..... how did u fix your problem???

markw8 · February 29, 2008

Have it towed to the dealer and let your warranty work. Mark.

superthink · August 18, 2016

Problem solved!

I fixed mine! Change everything they said to change. A/c still turned off.

Then I turned the heater all the way hot. Ran it for a while on low fan. Switched the temp control back and forth hot to cold. A/C has been working ever since

luap1980 · March 3, 2008

Have it towed to the dealer and let your warranty work. Mark.

Well taking it to a dealer would have been my first thought but since I bought my truck in the U.S. and I live in Canada my warranty does not kick in untill after 6 months/ 7500 miles but I saved $12000. Man are dealers in Canada gouging Canadians or what? Anyways, I found my problem was my block heater cord!! I had cut the thermostat "tumor" off the end of my cord so that the cord was operational above 0F/-18C. That night it was only -12C so I guess it tripped A sensor. A GM mechanic said he has seen stuff like this before if the cord is cut the truck gives out error codes when nothing is wrong.

abouthadenoughofgm · March 21, 2011

I have the same problem on an 07 4.3 1500 work truck and the dealer ship has been unable or unwilling to fix the problem. Does anyone have any ideas on how to fix this issue???????