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2003 3.4L Running Hot?

 
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mikelbeck
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2000 Mitsubishi Galant
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PostPosted: Wed Mar 12, 2014 10:21 am    Post subject:  2003 3.4L Running Hot? Reply with quote

I've recently had the LIM gasket, thermostat, radiator and a bunch of hoses replaced. Prior to doing all of this the temperature gauge was all over the place, sometimes very low and staying there other times floating between 1/4 and 3/4 and moving all around. Ever since, once the car is warmed up it goes to a little before half way and stays there for the most part.

Yesterday I was driving it and noticed that it would go past half way when I was sitting in traffic and would then drop back down after a minute or so or when I was got away from traffic and had nobody in front of me.

When I got home I hooked up my scanner to get the real values from the sensors and could watch what happens. When it was warmed up it was around 200 degrees. When it went past 1/2 way it would get to 218-220 degrees and the fans would come on until it dropped back down to 208-210 and then they'd shut off. The temperature would continue to drop until it was about 200 again and would start slowly creeping up until it go to 218-220 and the fans would kick on, etc. When it was at 200 the gauge showed a little before the half way mark, when it was at 220 it was a couple of lines past half-way but not near the red.

So my questions are:

1. What should the "normal" temperature be? Is 200 ok?
2. At what temperature should the fans go on?
3. Once the fans are on, how long should they stay on or at what temperature should they shut off?

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ZSPOT
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PostPosted: Wed Mar 12, 2014 12:53 pm    Post subject:   Reply with quote

Normal temp is around 195 - 205. Depends on your thermostat also. Cruizing down the raod with my 180 stat, temps stay right at 180. Even in 110 degree weather.

Here are the fan specs...

approx 217 low fan turn on
approx 230 high fan turn on

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mikelbeck
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2003 Chevrolet Impala
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1997 Dodge Ram


PostPosted: Wed Mar 12, 2014 12:58 pm    Post subject:   Reply with quote

ZSPOT wrote:
Normal temp is around 195 - 205. Depends on your thermostat also. Cruizing down the raod with my 180 stat, temps stay right at 180. Even in 110 degree weather.

Here are the fan specs...

approx 217 low fan turn on
approx 230 high fan turn on


I've got a stock thermostat which is what, 180 degrees? Or higher?

So then my fans turning on at 218-220 is right. Should I be concerned about the temps going up and down like they are?

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PostPosted: Wed Mar 12, 2014 1:00 pm    Post subject:   Reply with quote

Stock is 195.

Sounds like normal to me. As long as your coolant is fresh and clean after all that work that was done, I wouldn't worry to much about it.

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mikelbeck
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1997 Dodge Ram


PostPosted: Wed Mar 12, 2014 1:10 pm    Post subject:   Reply with quote

ZSPOT wrote:
Stock is 195.

Sounds like normal to me. As long as your coolant is fresh and clean after all that work that was done, I wouldn't worry to much about it.


Yep, it's all brand new and doesn't look like coffee grinds any more, it's a liquid now. Much betterer than it was.

I'm not going to worry about it then, and I'll have to get my wife used to it. She's a little skittish with this car since it's had so many problems in the past.

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PushrodPower
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PostPosted: Wed Mar 12, 2014 10:40 pm    Post subject:   Reply with quote

I would suggest bleeding the coolant. My 3.4 is dead on 180 degrees in cold weather and the heater on. With the heater off it doesn't go much higher.

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mikelbeck
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PostPosted: Thu Mar 13, 2014 10:17 am    Post subject:   Reply with quote

PushrodPower wrote:
I would suggest bleeding the coolant. My 3.4 is dead on 180 degrees in cold weather and the heater on. With the heater off it doesn't go much higher.


I bled it last night. Took 10 or 15 minutes of opening & closing the bleeders to get all the air out of it. Afterwards I took it out for a long drive and once it warmed up the temperature gauge only started to creep up when I was sitting at a very long traffic light and had to wait 2 cycles to get through... and even when it did creep up it never got to the halfway point. Once I started moving again it went back to it's normal position.

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PostPosted: Thu Mar 13, 2014 11:15 am    Post subject:   Reply with quote

doesnt hurt to bleed it once a week for a couple weeks since you had all the work done. Could still be some trapped air in the system.

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PostPosted: Fri Mar 14, 2014 2:36 am    Post subject:  Re: 2003 3.4L Running Hot? Reply with quote

mikelbeck wrote:
I've recently had the LIM gasket, thermostat, radiator and a bunch of hoses replaced. Prior to doing all of this the temperature gauge was all over the place, sometimes very low and staying there other times floating between 1/4 and 3/4 and moving all around. Ever since, once the car is warmed up it goes to a little before half way and stays there for the most part.

Yesterday I was driving it and noticed that it would go past half way when I was sitting in traffic and would then drop back down after a minute or so or when I was got away from traffic and had nobody in front of me.

When I got home I hooked up my scanner to get the real values from the sensors and could watch what happens. When it was warmed up it was around 200 degrees. When it went past 1/2 way it would get to 218-220 degrees and the fans would come on until it dropped back down to 208-210 and then they'd shut off. The temperature would continue to drop until it was about 200 again and would start slowly creeping up until it go to 218-220 and the fans would kick on, etc. When it was at 200 the gauge showed a little before the half way mark, when it was at 220 it was a couple of lines past half-way but not near the red.

So my questions are:

1. What should the "normal" temperature be? Is 200 ok?
2. At what temperature should the fans go on?
3. Once the fans are on, how long should they stay on or at what temperature should they shut off?
normally in traffic my will be slightly above the 1/2 mark below the 1/2 with normal driving .. if you are worried about over heating i.e 3/4 mark. turning on the heater will cool it down I had to do this on the I-15 passing over Cajon Summit in the Cajon Pass area.. but it was extremely hot that day about 110F
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