Towing temp going up

[97audia4]

Tow haul mode on up hill with 5k trailer temps keep going up with ac on. Temp went to 235 then I pulled over and went down right to 210. Did that twice but always went down . Most of the trip was uphill for 275 miles .

 

[swathdiver]

Tow haul mode on up hill with 5k trailer temps keep going up with ac on. Temp went to 235 then I pulled over and went down right to 210. Did that twice but always went down . Most of the trip was uphill for 275 miles .

The trans can take that temp easily, the warnings don't come on until the 260s. However, the fluid is quickly used up and should be replaced soon than later.

The engine will cool better towing in 4th with the rpms up too if you weren't already doing that or in 3rd if going slower. 5th and 6th make a lot of heat in overdrive with low engine rpms.

 

[97audia4]

The trans can take that temp easily, the warnings don't come on until the 260s. However, the fluid is quickly used up and should be replaced soon than later.

The engine will cool better towing in 4th with the rpms up too if you weren't already doing that or in 3rd if going slower. 5th and 6th make a lot of heat in overdrive with low engine rpms.

It's coolant temp going up , trans temp stayed 165 . Coolant almost hit 240 at one point towing in 4th at 54

 

[intheburbs]

Shouldn't behave like that. Only time I see the coolant temp move is when I'm REALLY stressing it, like pulling an 8600-lb trailer up the Continental Divide summits in the Rockies.

Check the radiator fins for dirt/debris. When was the last time you changed the coolant and did a flush?

 

[97audia4]

Shouldn't behave like that. Only time I see the coolant temp move is when I'm REALLY stressing it, like pulling an 8600-lb trailer up the Continental Divide summits in the Rockies.

Check the radiator fins for dirt/debris. When was the last time you changed the coolant and did a flush?

I'll double check it , coolant was rushed about 7 months ago with fresh coolant. It's super clean still and at the full mark

 

[mikeyss]

Are your cooling fans running? Also, maybe the water pump is starting to go bad. I think the impellor in them go bad and won't circulate coolant effectively.

 

[89Suburban]

Are your cooling fans running? Also, maybe the water pump is starting to go bad. I think the impellor in them go bad and won't circulate coolant effectively.

Impeller goes bad??

 

[97audia4]

Are your cooling fans running? Also, maybe the water pump is starting to go bad. I think the impellor in them go bad and won't circulate coolant effectively.

Fans are running , ac is on and you can hear them running.

 

[97audia4]

The strange part is when I pull over it goes from 240 to 210 on the guage in no time and I can continue on for a little bit before it goes up again

 

[gooffeyguy]

Air in the coolant system?

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[97audia4]

Air in the coolant system?

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If there was air it wouldn't go down to 210 so quickly as it does .

 

[mikeyss]

Impeller goes bad??

Looks kinda like this:

 

[gooffeyguy]

If there was air it wouldn't go down to 210 so quickly as it does .

You have a Tru-Cool 40k installed too right?

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[swathdiver]

The strange part is when I pull over it goes from 240 to 210 on the guage in no time and I can continue on for a little bit before it goes up again

The gauge is programmed to act like that so as not to send the soccer moms into the dealerships.

 

[97audia4]

You have a Tru-Cool 40k installed too right?

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Yes the trans temp was fine 170 max mostly 165 at all times.

Coolant temp going up to 240 even in 4th gear or in tow haul mode on the highway . Might do the water pump in the parking lot of autozone tomorrow on the way home and see if that helps. The radiator is only 2 years old and coolant is fresh and clean . Yes it's dexcool.

 

[97audia4]

The gauge is programmed to act like that so as not to send the soccer moms into the dealerships.

So it goes up to 240 with no warnings then too ? It held the temp fine at idle once we got got gas and fans were spinning loud . Idk why at highway speeds it would over heat if at idle it's fine and comes down

 

[CaptainAmerica1]

It’s the water pump..

 

[swathdiver]

So it goes up to 240 with no warnings then too ? It held the temp fine at idle once we got got gas and fans were spinning loud . Idk why at highway speeds it would over heat if at idle it's fine and comes down

The gauge is dampened and doesn't move much between 195 (thermostat) and around 210. If it gets hotter it will certainly move that way. You might want to check the composition of your coolant, some folks find 60-40 water to coolant lowers their temperatures more than a 50/50 mix.

 

[97audia4]

Water pump is original at 125k so it's more than likely not flowing it enough . Looks like I'm going to be doing a water pump at the racetrack . Need to make 275 miles home up some serious hills .

 

[Foggy]

Has anyone found a high performance water pump for our apps???
I put in a new ac delco pump in march, and i'm getting hot while towing too.
Never thought about a water pump as I used a high quality one