Weird noise going from park to drive.

[Ozymandias]

well that’s quite excessive. Can the heat exchanger be removed or bypassed? I live in Texas so it does get cold here during the winter

Leave that heat exchanger alone as long as it doesn't leak.
And if you want to mess with it do it strictly according to the workshop manual or you'll destroy it internally and then it really leaks.

Remember fluid/fluid cooling is 100 times more efficient then fluid/air cooling.

 

[CrewCabDiesel]

Been a lot of debate over the block transmission cooler. In reality it heats the transmission fluid, what runs cooler, engine coolant or the transmission without the block cooler? Answer engine coolant runs about 195 degrees without a load. Transmission fluid without load 130-150 degrees with traffic. With 12k 5th 180 degrees to 200 degrees with traffic. This is the same with my 2004 and my son's 2000 using only factory trans cooler by the radiator. Also we live in central Florida and it gets warm here too.

 

[CrewCabDiesel]

Let me clarify, I am not talking about the internal oil cooler on the engine passenger side that should be left alone unless a gasket fails. I am referring to the cooler/heater on the driver's side behind the motor mount.

 

[Ozymandias]

There is only a cooler on the drivers side, Passenger side was Gen2.
And no it isn't a heater, it is a heat exchanger and the transmission is happy to run at 195°. To keep it below that we have the additional radiator in the front that brings it down to 150 or so cruising down the road.

Where that heat exchanger really shines is under heavy use and massive heat loads because it can bring down and keep down the Trans temps way better then any fluid to air cooler can. I'd never take that out of the circuit.
Your Trans can produce easily 100Kw or more of heat in very short time just by working it hard. The cooling system needs to keep that in line, that's why we have that cooler there. Not to heat the fluid on a cold day, this is accomplished by the Torque converter right at the first stop sign.

 

[Randomrunner12]

There is only a cooler on the drivers side, Passenger side was Gen2.
And no it isn't a heater, it is a heat exchanger and the transmission is happy to run at 195°. To keep it below that we have the additional radiator in the front that brings it down to 150 or so cruising down the road.

Where that heat exchanger really shines is under heavy use and massive heat loads because it can bring down and keep down the Trans temps way better then any fluid to air cooler can. I'd never take that out of the circuit.
Your Trans can produce easily 100Kw or more of heat in very short time just by working it hard. The cooling system needs to keep that in line, that's why we have that cooler there. Not to heat the fluid on a cold day, this is accomplished by the Torque converter right at the first stop sign.

Thanks Ozy for explaining this to me. I've learned a lot from this post and all of you that have replied.

 

[Randomrunner12]

I think I know exactly what that is as I had it myself! Check the transmission dipstick in the engine bay. Mine made that sound due to it vibrating against the firewall or something. Started after I had the trans pulled to replace rear main seal. Can try bending it out a bit more, or do what I did, stick/wrap a piece of pipe insulation between the tube and the firewall. Stopped it.

Bent it just a bit to clear the firewall but not be closer to turbo. Worked like a dream. What pipe insulation did you use? Wondering what is safe to be that close to exhaust and turbo but not melt down

 

[bigceltic]

Bent it just a bit to clear the firewall but not be closer to turbo. Worked like a dream. What pipe insulation did you use? Wondering what is safe to be that close to exhaust and turbo but not melt down

I am glad that worked! Soon as I heard your recording I knew exactly what it was! I just used standard pipe insulation from Home Depot. Far enough away from hot stuff that it doesn't melt (so far), and only enough to stop it from hitting the firewall.

 

[Randomrunner12]

I am glad that worked! Soon as I heard your recording I knew exactly what it was! I just used standard pipe insulation from Home Depot. Far enough away from hot stuff that it doesn't melt (so far), and only enough to stop it from hitting the firewall.

nice!!! thank you sir. I was thinking of just using some 1/2” or 3/8” high temp fuel line and slide it over the top of the dipstick and then hose clamp it in place. But it was definitely that. There were specific areas on my drive to work where you could hear it turning left and after adjusting the dipstick didn’t happen and made the drive nice lol

 

[bigceltic]

nice!!! thank you sir. I was thinking of just using some 1/2” or 3/8” high temp fuel line and slide it over the top of the dipstick and then hose clamp it in place. But it was definitely that. There were specific areas on my drive to work where you could hear it turning left and after adjusting the dipstick didn’t happen and made the drive nice lol

Funny thing for me was I had solved the problem with the insulation, then had a new trans put in (and the dipstick was routed correctly) so no problem. Then I had my HVAC box redone (all new doors and actuators) and new heater core and AC bits (go big or go home!), and a few days later I got the sound again, but much softer (like the sound in your recording). I swore it came from the dash! (when you mentioned that I knew!) and took it back to the shop thinking they missed something in the dash when the put it back together, and when I picked it up they told me it was the dipstick again! DOH! Now I know....

 

[Randomrunner12]

Funny thing for me was I had solved the problem with the insulation, then had a new trans put in (and the dipstick was routed correctly) so no problem. Then I had my HVAC box redone (all new doors and actuators) and new heater core and AC bits (go big or go home!), and a few days later I got the sound again, but much softer (like the sound in your recording). I swore it came from the dash! (when you mentioned that I knew!) and took it back to the shop thinking they missed something in the dash when the put it back together, and when I picked it up they told me it was the dipstick again! DOH! Now I know....

yeah I was just recently quoted 3700$ to rebuild my ac box with doors, heater core and evap core. Trying to decide if I’m going to do it myself or not lol. I definitely am using blend doors USA for the doors and likely oreilly for the evap and heater core.

 

[bigceltic]

yeah I was just recently quoted 3700$ to rebuild my ac box with doors, heater core and evap core. Trying to decide if I’m going to do it myself or not lol. I definitely am using blend doors USA for the doors and likely oreilly for the evap and heater core.

I say go for it. I cost me about that (used blend door usa doors) but what a difference it made! At the same time I had them remove the screen in the HVAC box (I have a first year megacab) and WOW the difference it made - now I have (for the first time ever) full flow from the panel vents. Should have done it years ago.

 

[Randomrunner12]

I say go for it. I cost me about that (used blend door usa doors) but what a difference it made! At the same time I had them remove the screen in the HVAC box (I have a first year megacab) and WOW the difference it made - now I have (for the first time ever) full flow from the panel vents. Should have done it years ago.

Copy thanks!!!!

 

[Ozymandias]

I've mine fixed like this for years as it was always violently vibrating at idle.

 

[Randomrunner12]

Hahahaha epic!!!! Low the basic fix.
What are the blue lines for?

 

[Ozymandias]

ESPAR engine pre-heater and the small ones for the coolant filter.

 

[sag2]

Been a lot of debate over the block transmission cooler. In reality it heats the transmission fluid, what runs cooler, engine coolant or the transmission without the block cooler? Answer engine coolant runs about 195 degrees without a load. Transmission fluid without load 130-150 degrees with traffic. With 12k 5th 180 degrees to 200 degrees with traffic. This is the same with my 2004 and my son's 2000 using only factory trans cooler by the radiator. Also we live in central Florida and it gets warm here too.

It isn't a heater, it's a cooler. It is plumbed to the cool side of the radiator/engine which should run 20-50° above ambient. The only trucks that have a transmission heater are 1500 with 8 speed. They have a three way valve to heat or cool the transmission.

 

[bigceltic]

I've mine fixed like this for years as it was always violently vibrating at idle.

Funny thing, I just looked at mine and the shop did exactly what you have (big ol' zip tie)!