Question about 2003 Chevrolet Monte Carlo

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Did a fluid change and treatment on a 2003 monte carlo

Still get hard shifts and it is very periodic only happpens maybe every other day any thing that could cause this i have a heater core leak t the moment could that possibly have anythimg to do with it

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Are you serious? Why would you even mention a heater core leak in regard to a transmission shift issue?

You need to know what items determine shift stratagy to solve this.

eg: TPS Sensor, Various Trans Sensors and Solenoids Etc.

Posted on Apr 30, 2010

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Posted on Jan 02, 2017

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Code P1870 for a 1996 Chevrolet Monte Carlo Z34 3.4 litre


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1 Answer

My monte carlo is shifting hard


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1 Answer

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Transmission. Check fluid level using proper checking procedure, which is usually get to operating temperature (take it for a short drive), park it in neutral idling, parking brake on. Fluid should be at correct level, and red in color. Anything else, have a transmission flush and fill, do the filter as well, just to be safe. It's a good place to start. And hopefully you don;t have bigger problems. Hope this helps.

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Mar 21, 2010 | 2003 Chevrolet Monte Carlo

1 Answer

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2002 Monte Carlo


Sounds like a transmission modulator. Its on the back of transmission with the vacuum line running to it.
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