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GM block heater therostat bypass #4609529
12/20/17 06:58 PM
12/20/17 06:58 PM
Joined: Jul 2015
Posts: 127
Alberta
BigJakeChevy Offline OP
BigJakeChevy  Offline OP
Joined: Jul 2015
Posts: 127
Alberta
Does anyone have experience cutting the thermostat end off their block heater cord? Will it cause any check engine light? Any other issues that could happen here? Info online is inconsistent. Thanks!


2007 Silverado Classic 1500 Crewcab 5.3L 460,000kms
Engine oil Mobil 1 0w40fs
Oil Filter Fram Ultra 10575
Trans Oil Amsoil Torque Drive
Front Diff Amsoil SG75w90
T-Case Autotrak II
Rear Diff Amsoil SG75w140
Re: GM block heater therostat bypass [Re: BigJakeChevy] #4609558
12/20/17 07:31 PM
12/20/17 07:31 PM
Joined: Sep 2014
Posts: 1,460
Toronto Canada
WobblyElvis Offline
WobblyElvis  Offline
Joined: Sep 2014
Posts: 1,460
Toronto Canada
I can't see this causing any problems. I don't understand why they would make it so the heater does not come on when the temp is above 0 degrees F. I would cut off the end and replace it.

Re: GM block heater therostat bypass [Re: BigJakeChevy] #4609563
12/20/17 07:35 PM
12/20/17 07:35 PM
Joined: Aug 2016
Posts: 292
Alberta
carviewsonic Offline
carviewsonic  Offline
Joined: Aug 2016
Posts: 292
Alberta
Could set p0116 code if difference between coolant temp and intake air (ambient) temp is 30 deg C or more. If you use a timer so block heater is on for no more than 2-3 hrs that wouldn't be a problem. If you leave it plugged in all night it could set the code. The ECM assumes the engine temp sensor is faulty, and sets fuel map for 80 deg C. Also runs cooling fans (if your truck has electric cooling fans). Happened on my 2005 Buick, I erased the p0116 code with a code reader, and am now more careful not to plug in more than necessary.


'18 Impala
'03 Park Avenue
'05 Park Avenue
'07 Honda Accord
'09 VStar 1300
Re: GM block heater therostat bypass [Re: BigJakeChevy] #4609819
12/21/17 02:16 AM
12/21/17 02:16 AM
Joined: Jul 2015
Posts: 127
Alberta
BigJakeChevy Offline OP
BigJakeChevy  Offline OP
Joined: Jul 2015
Posts: 127
Alberta
Thank you for the info.


2007 Silverado Classic 1500 Crewcab 5.3L 460,000kms
Engine oil Mobil 1 0w40fs
Oil Filter Fram Ultra 10575
Trans Oil Amsoil Torque Drive
Front Diff Amsoil SG75w90
T-Case Autotrak II
Rear Diff Amsoil SG75w140

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