Secondary Cooling System
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Joined: Feb 2013
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From: British Columbia
Secondary Cooling System
My secondary cooling system had to be topped up twice now in the last month. 600ml first time and 350ml second time. Had couple trips hauling my rv through the mountains here. It's been warm to hot. I've done this trip in the past with no loss of coolant that I remember. Engine runs fine. I watch my gauges religiously, nothing seems out of the ordinary other than I thought my trans temps are running slightly higher than what I'm used too. Maybe 10-15 degrees. I know it's the secondary running through the trans cooler, if that even means anything. Anyone have any experience with coolant loss or evaporation in the secondary system? Thanks.
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Joined: Feb 2013
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From: British Columbia
The trans temps in the past have always been 10-30 degrees cooler than the oil and coolant temps, which have been within 10-15 degrees difference of each other, depending on my driving. Now they're almost always the same. And the tranny seems to heat up quicker now.
8th Gear
Joined: Sep 2020
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I just had this same issue with my truck, and my temps would run 230 in the city on some days, and I knew that couldn't be right; I took it to the shop, and I was told my intercooler needed to be replaced. I asked if it could've been the thermostats and was told no, it was the intercooler; fast forward a year later, and I'm still having temperature issues. I took it back in because I was getting a code about my intercooler, they looked it over and determined that indeed my intercooler went bad again, but it was covered under warranty. So now the shop has lost money and needed to figure out what's causing the problem, as it turns out my thermostats in the secondary coolant system one was working, and the other wasn't.
Problem Solved! Now my trans temp never goes above 203 degrees.
I remember when I was young working with my dad on our trucks whenever a water pump was leaking or needed to be replaced, he always told me to change the thermostats. Since you already had the fluid drained and are in the engine, it's cheap insurance so that you don't have to crawl back into the engine.
Have a shop look at your intercooler and thermostats that's the issue.
Problem Solved! Now my trans temp never goes above 203 degrees.
I remember when I was young working with my dad on our trucks whenever a water pump was leaking or needed to be replaced, he always told me to change the thermostats. Since you already had the fluid drained and are in the engine, it's cheap insurance so that you don't have to crawl back into the engine.
Have a shop look at your intercooler and thermostats that's the issue.
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Thread Starter
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More Turbo
Joined: Feb 2013
Posts: 689
Likes: 44
From: British Columbia
I just had this same issue with my truck, and my temps would run 230 in the city on some days, and I knew that couldn't be right; I took it to the shop, and I was told my intercooler needed to be replaced. I asked if it could've been the thermostats and was told no, it was the intercooler; fast forward a year later, and I'm still having temperature issues. I took it back in because I was getting a code about my intercooler, they looked it over and determined that indeed my intercooler went bad again, but it was covered under warranty. So now the shop has lost money and needed to figure out what's causing the problem, as it turns out my thermostats in the secondary coolant system one was working, and the other wasn't.
Problem Solved! Now my trans temp never goes above 203 degrees.
I remember when I was young working with my dad on our trucks whenever a water pump was leaking or needed to be replaced, he always told me to change the thermostats. Since you already had the fluid drained and are in the engine, it's cheap insurance so that you don't have to crawl back into the engine.
Have a shop look at your intercooler and thermostats that's the issue.
Problem Solved! Now my trans temp never goes above 203 degrees.
I remember when I was young working with my dad on our trucks whenever a water pump was leaking or needed to be replaced, he always told me to change the thermostats. Since you already had the fluid drained and are in the engine, it's cheap insurance so that you don't have to crawl back into the engine.
Have a shop look at your intercooler and thermostats that's the issue.
You mean 'oil cooler' or trans cooler?
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More Turbo
Joined: Feb 2013
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From: British Columbia
I agree with you guys on the engine oil being cooled by the primary system. I'm not sure that I follow you on your statements of having the oil cooler looked at? It's the secondary system that I'm losing coolant. My engine temps are ok. My tranny temps seem to be catching up to oil temps lately. My tranny temps have always been cooler that I remember.
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More Turbo
Joined: Feb 2013
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From: British Columbia
8th Gear
Joined: Sep 2020
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This fixed all of my transmission temp issues.
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