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Oh, no, was thinking this was an A0 discussion. The A1/A1R with the cat 3126 and C7 did not divert the bypass coolant down to the trans cooler…

:) Yep, with the bypass flow going to the trans cooler/heat exchanger, the A0 will not warm up until the trans warms up and until enough load is applied to overcome the cooling capacity of the transmission. With my altered flow, mine warms right up to op temp now unless I have the heater flow on…

oh yea there is a restrictor there where the bypass line connects to the port on top of the trans heat exchanger. Even in place it has enough flow to keep the engine from warming until it gets load applied. At 65f in gear at slightly elevated idle(cold wx warmup procedure), my thermostat will...

Its a 2 plate thermostat. The upper port to the rad is closed when cold and the lower bypass port is open to recirc coolant back thru the engine(or thru the trans cooler on the A0). As the engine warms and the thermostat opens, the core shifts the 2 plates down, opening the passage to the rad...

The temp sensor and the over-temp switch are mounted in the thermostat housing. That is the best place to shoot with an IR. You should see a temp difference between that and the elbow/ upper rad pipe until you reach the thermostat opening point around 178F. Once the thermostat cracks and...

With all the bypass coolant going to the trans cooler instead of back into the engine, you basically don’t have a thermostat anyway until the trans becomes a heat source. They did away with the bypass on the A1/A1R so they warm up better/easier than an A0 does… Mmmm Exhaust Brake, Mmmm:)...

The coolant loop is independent of the thermostat, so if the level is good, it should purge the heater loop as soon as RPM is increased. yea the A0 is cold blooded as they sent the bypass coolant down to the trans cooler instead of back thru the block like cat intended. You have to warm up all...

Yo You don’t even have to pull the grill. Pull the heat control to get to the hot/heat position. Tip the cab and drain down a few gallons of coolant and disconnect the heater supply pipe off of the back side of the thermostat housing. See if you can blow some low pressure air thru that line...