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2005 Chevy Colorado I-5 engine, 4WD, automatic has no ...
Sent to Car Experts February 06 07:58 PM

2005 Chevy Colorado I-5 engine, 4WD, automatic has no engine braking. Brakes overheat on steep roads, must downshift to L, even 4WD Low. On freeway downgrades, speeds up to over 80 mph. Dealer can't find reason. Does this transmission have lockup torque converter that is unlocking when coasting?

Optional Information:
2005 Chevrolet 2005 I-5

Already Tried:
3 trips to dealer

Customer (name blocked for privacy)
Status:  Closed   Value: $10
Info Request
February 6 9:01 PM (1 hour and 3 minutes and 2 seconds later)
         
How steep a grade are we talking about?This is normal on some steep grades like Pikes Peak for instance.Almost no vehicle can make the trip without pulling over to cool the brakes.

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21yrs.Foreign and domestic driveability diagnosis and repair/ ASE Cert./Fuel Injection Specialist.
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