97 GMC Sierra SLT 5.7 123K, multiple problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lucky_7 · 11-19-2014, 06:34 PM

Hey Guys,

Im having a few issues with my 97, first the dash get really hot when the heater is on, and there is a weird sound from under the dash when I start the truck. Also the defrost stays on all the time....Maybe the vent motors/valves?

Second, when its cold, on the first cold start of the day the motor is making a rattling noise, I think it has done this before but this year its a little more noticeable. Sounds like a dry start from the bottom of the motor....

Third, My o2 sensor has gone out, 2 bank 2nd sensor, should I change all four?

11-19-2014, 06:34 PM	#1
lucky_7 Registered User Join Date: Mar 2013 Location: Muskogee, Ok. Posts: 123	97 GMC Sierra SLT 5.7 123K, multiple problems Hey Guys, Im having a few issues with my 97, first the dash get really hot when the heater is on, and there is a weird sound from under the dash when I start the truck. Also the defrost stays on all the time....Maybe the vent motors/valves? Second, when its cold, on the first cold start of the day the motor is making a rattling noise, I think it has done this before but this year its a little more noticeable. Sounds like a dry start from the bottom of the motor.... Third, My o2 sensor has gone out, 2 bank 2nd sensor, should I change all four?



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