Eight problems related to automatic transmission cooler have been reported for the 2003 Chevrolet Trailblazer. The most recently reported issues are listed below.
2003 Chevrolet Trailblazer. Consumer writes in regards to fuel tank and rust holes the consumer was informed the fuel tank was leaking, due to rust holes and pitting. There was also a defect with the filler tube. The consumer was informed the fuel pump would need to be replaced due to the other problems with the fuel system. Also, the transmission cooling lines were replaced, due to a leak .
2003 Chevrolet Trailblazer ext, failure of transmission fluid cooling lines due to corrosion. Loss of transmission fluid and possible transmission failure due to loss. Replace all transmission cooling lines (4 sections).
While driving on a interstate at highway speed. My vehicle had a sudden decrease in forward momentum. The engine rpm's increased dramatically and the vehicle had unpredictable surges and loss of ability to maintain speed. After driving down the berm to the interstate exit, I noted a burning smell. The smell was that of transmission fluid that had leaked out from a corroded transmission cooling line.
Transmission cooling line corrosion and leak.
The transmission cooling lines corroded which caused the transmission fluid to leak out while on a 20 mile round trip from our house. The truck started to run rough as we pulled in the driveway and there it died. I had it towed to a local transmission repair shop where they confirmed the transmission was dead, rebuild or replace. I paid to tow it to the gm dealership where I bought the truck and they confirmed the tranny was dead. Aluminum cooling lines rotted out, drained the fluid and the unit fried. There are no warning lights or monitoring of this fluid level per gm. This truck had been serviced by this dealership. The service mechanic told me that this is not a common occurrence but this is not rare either. He said gm will not help with the repairs and he was right. I had the local tranney shop do the repairs for 2500. 00, less than gm's 4500. 00. There have been many problems with this truck, I will do another report regarding the failed door latches, and I gave gm the time to repair their problems and then they tell you to "stuff it" when their bad designs get real costly. Last gm in my driveway.
Transmission line leaking. Cooling line rubbing on catalytic converter. Transmission fluid leaking on converter. Smoke could be seen. Possible fire issue. Transmission failure possible if fluid level too low. Line was in contact with converter. Remedy was to have all lines replaced so they were routed away from converter.
I'd driven 60 miles to destination. 1/2 hour later went out to Trailblazer. There was a large puddle of transmission fluid under the vehicle and a trail of drips leading up to it. Mechanic determined the line rubbed on catalytic converter and wore a hole in it. The fluid sprayed all over under the vehicle. He said it was amazing there wasn't a fire because of how flammable it is and how hot the converter gets. It was down 4 quarts of fluid. He spliced out the worn line and used a coupler to fix it and move it away from the converter.
Trans coolant lines rubbed against cat converter, causing leaks. 4 - 4. 5 qts of trans fluid leaked out. Trans overheated and failed on the highway, causing vehicle to stop in an unsafe location. Transmission had to be replaced.