Question about 2001 Pontiac Grand Am SE

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Temperature stays at 100 and doesnt go up during operation

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If the gauge is correct,you may have a thermostat stuck open.Check and replace the thermostat.Your vehicle needs to run a certain temperature for the computer to switch to and operate correctly in closed loop mode..Good Luck!!!

Posted on Aug 05, 2008


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1 Answer

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Heating problems are very frequent problem with G.C.
However, the root causes are not necessarely the sames.

First, do you run a 4.0 L or 4.7L
Second, is your vehicule equipped with dual zone air control (driver side and passenger side controlled independently)
Third, does you temperature gauge needle in your dash indicate very near to 100 degrees C or 195 degrees F when the engine reachs its normal operating temp.
Fourth, does it heat a little bit or nothing at all
Fifth, what is the average wheather temperature in your living country

Please provide these info and we will try to help you.

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2 Answers

Keep getting code po420

Before Checking a Catalytic
Converter DTC
Before you troubleshoot an OBD II vehicle that stores
DTC P0420 (67) (catalyst system efficiency below
threshold), run these quick checks:
1. Check for a leak in the exhaust system. If you find
one, repair it, clear the DTC, and test-drive the
• If the DTC returns, go to step 2.
2. Connect the PGM Tester, and test-drive the vehicle
while an assistant monitors the voltage signal from
the secondary oxygen sensor (HO2S S2). After the
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voltage should stay between 0.5 and 0.8 V at steady
cruising speed. During deceleration, the voltage
should be steady at 0.1 V or less.
• If the voltage readings are OK, clear the DTC.
• At cruising speed, if the voltage fluctuates or stays
below 5 V, go to step 3.
3. Measure the inlet and outlet external temperatures of
the catalytic converter with a thermometer capable
of reading up to 500°F.
• If the outlet temperature is more than 100°F hotter
than the inlet temperature, the converter is OK.
• If the outlet temperature is less than 100°F hotter
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1 Answer

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