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Hello all i have a 89 Burban I am working on I drve my 99 most of the time so my baby the 89 sits up alot. I ry to keep her running but she has been running hot alot lately I have just replaced the themostat last year arond this time could it be bad already???? If not where should I start looking first???
 

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You can test the t-stat. Pull it and drop it in a pot of boiling water. If it opens the stat is OK. Replace it otherwise. No leaks, or bubbling in the radiator? If so, a cooling system pressure test is in order. Otherwise, it just might be a bad radiator.
 
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