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couple engine problems? can ya help?


98layinframe

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For the life of me i cant find the coolent temp sensor on my 98 3.8L monte.. where is this thing located? Reason im looking for it is the gauge on my dash never ever climbs to normal operation temperature and the cooling fans on the rad dont kick on unless i have the ac on. I already changed the thermostat out and the motor is reaching operating temps so theres something electrical wrong. Dont know if its normal or what, but also in the winter the heater never really gets all that hot and the car takes forever to warm up. Maybe something else going on here?

 

Also noticed just the other day it started doing it, but when the car is first started the change oil light is on for a about 30 seconds then goes off. OK, no big deal, changed the oil even though it only had 2K miles on it... well the light still comes on when the car is started. Any ideas there?

 

thanks in advance for any help.

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I think the CTS should be around the coolant outlet. Aroundabout where your thermostat is.

 

The Change Oil light can be reset. There should be a button somewhere on the bottom side of the dash. Push and hold it and the Change Oil should flash a couple of times to let you know it's been reset.

Edited by ruktosk
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1. 3800 1.5 gens are NOTORIOUS for 'not warming up fully'. I have a monte z34 that does the same thing, and I know of several other members with the same problem and no one has figured it out.

 

2. There is no button to reset, its a combo type thing. I think you have to put the gas pedal to the floor 3 times while the ignition is on, but not running obviously.

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2. There is no button to reset, its a combo type thing. I think you have to put the gas pedal to the floor 3 times while the ignition is on, but not running obviously.

 

Oh right. The button is for the tire pressure sensors. My bad.

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here's the procedure to get the oil change light off:

 

key on-engine off:

 

fully press and release the accelerator 3 times within 5 seconds.

 

if the light blinks twice, it's reset, if it just comes on and stays on for 5 seconds, try again.

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thanks for the replys guys, well found the coolent sensor and replaced it... still no luck nothing different. Also found and did the oil reset procedure.. atleast that worked.:lol:

 

 

Ok for the guys that the car doesnt warm up fully.. do your cooling fans still come on? Mine dont do a damn thing unless i turn the ac on, then they both start working. Im just worried about sitting in traffic and the stupid thing over heating or some shit since the fans wont work. Dont know if its worth it to take the thing to a stealership to be diagnosed or not.

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I've never seen the gauge rise up to the middle of the gauge... even after 2 hours of constant driving. Today after replacing the coolant sensor I started and let the car run for a good 10 mins, the guage only started to rise a little bit so I took it for a couple mile drive. Along the side of the road i stopped and popped the hood, the upper rad hose was quite warm and the motor itself seemed warmed by just holding my hand close to it. Drove back home and let it idle some more, the gauge maybe rose to a 10 o'clock position on the gauge (most normal cars operate at with the needle at a 12 o'clock position) which is a little higher then it normally ever does, but still no fans kicking on.

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yeah.. thats whats im worried about the most. If something is wrong with the gauge or electronics, just letting it sit there and over heat doesn't sound like fun.

 

 

The fans kick on at the half way point, I doubt there is anything wrong with your gauges

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My 03 GP gauge only goes to the 1/4 mark, never to the halfway mark at all... but with a scantool, I check and my engine was running at 195 degrees... The fans dont kick on till 220... I dont believe you have a problem

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