94 Buick road master overheating

10

Asked by Guru9WH59R Feb 28, 2021 at 06:46 PM about the 1994 Buick Roadmaster Limited Sedan RWD

Question type: General

While in idle and within minutes my engine
overheats.ac works fine as well as heater,the
reserve is full of coolant and both fans work.I got
the codes 26,27,44,55 when I dude the diagnostic
through the Hvac controls.

4 Answers
157,855

James answered 3 years ago

Codes 26 and 27 are quad driver error codes. Code 55 is an ECM failure code. When you replace the ECM transfer the PROM from the old ECM to the new one. Hope that helps! Jim

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10

Guru9WH59R answered 3 years ago

Thanks,I’m really trying to learn to all this on my own through YouTube so I will be looking that helpful info up to see can I do it or just are it to a shop

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157,855

James answered 3 years ago

You're welcome. Glad to help! You might consider getting a factory shop manual for your Roadmaster. It will have a wealth of information about service and repair. Try Ebay for a good used copy or Faxon Auto Literature in Riverside CA for a reprint. They have a website. Jim

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