Trans oil coolers are now eliminated on all new Express and Savana vans
#1
Trans oil coolers are now eliminated on all new Express and Savana vans
Came across this GMA news bulletin recently which confirms the loss of the transmission oil coolers in future production runs. Glad I have one as well as an additional cooler I installed in-line of the OEM. Temps have never exceeded 195, even in 90+ degree weather towing 7600lbs of trailer up a mountain grade. Don't know how the new vans' transmissions will hold up when taxed.
https://gmauthority.com/blog/2021/05...on-oil-cooler/
https://gmauthority.com/blog/2021/05...on-oil-cooler/
#2
CF Veteran
From the article...
To me, this indicates the secondary cooler that’s mounted in front of the condenser is what’s being removed, but the primary cooler (part of the radiator assembly) is still being used.
Now, GM Authority has learned that both vans will no longer come equipped with an external transmission oil cooler.
To me, this indicates the secondary cooler that’s mounted in front of the condenser is what’s being removed, but the primary cooler (part of the radiator assembly) is still being used.
#3
My thoughts too. Unfortunately, any HD vehicle towing anything significant requires an auxillary trans cooler. I'm just glad my van has two.
#6
CF Veteran
The trucks that don’t have the expansion valve are equipped with the secondary cooler. I don’t know what the RPO code is, but when reading GM service information, they define the dual cooler set up as “HD cooling.”
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#8
I think that's called coincidence, not irony.
But anyway, they're probably doing this to meet stricter fuel consumption laws. Same reason they started building bypass valves into water pumps.
But anyway, they're probably doing this to meet stricter fuel consumption laws. Same reason they started building bypass valves into water pumps.
#9
I thought thermal expansion valves were for systems where you have gas-liquid phase transitions. (like AC refrigerant). If a valve is simply actuated by temperature then isn't that just a thermostat? (like the coolant loop)
#10
CF Veteran
An expansion valve creates a reduction in pressure and allows expansion of the refrigerant to occur - since pressure and temperature are directly proportional, as the pressure drops, so does the temperature. The diaphragm in the TXV reacts to the change in temperature and the size of the orifice increases and decreases accordingly.
The cooler line thermostat doesn’t change the pressure but it regulates flow through the cooler based on changes in temperature, so the valve inside the thermostat is also opening and closing in the same way as a TXV.
I replace the cooler lines with the thermostat on them quite a bit - next time I do, I’ll try to remember to save the valve and take some pictures - the design (internal and external) of the thermostat and block type TXV are very similar.