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diesel K5 running hot?

Discussion in 'The Garage' started by KGsK5, Aug 28, 2006.

  1. KGsK5

    KGsK5 1/2 ton status

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    my 6.2 in my 83 blazer seems to be running hot. the temp guage on the dash is reading 220 after it warms up and runs for a bit. is this too hot?:confused: i dont no much about diesels so any input on this one would be greatly appreciated.
     
  2. BowtieBlazer

    BowtieBlazer 1/2 ton status

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    Is there bubbles running back into the overflow resevoir after running it for a little while? 220 is a bit too hot for a diesel, may have a head gasket leak or cracked block that rears its ugly head after starting.

    could be a bad guage though, try running it from cold with no rad cap on at idle and see if it gets hot
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    At idle a 6.2 should have trouble getting warm enough to open the thermostat. They really don't warm up until they work a bit. If it's getting that hot at idle I'd be taking a much closer look at everything to find the problem.

    Rene
     
  4. KGsK5

    KGsK5 1/2 ton status

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    should i start by flushing the radiator? or do you think its more involved then that?
     
  5. BowtieBlazer

    BowtieBlazer 1/2 ton status

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    thats a good start
     
  6. diesel4me

    diesel4me 1 ton status Premium Member

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    but first!..

    Remove the thermostat before flushing ,for best resuls..I'd ditch it and get a new one,whatever temp the 6.2 came with originally (sorry,I'm not sure what temp is correct for a diesel--gas motors use 195 degrees,but I've never had to change my 6.2's thermostst yet!)...if flushing doesn't help,it could be a head gasket or leak in the block,or a clogged radiator that isn't flowing enough coolant..or a defective water pump impeller,collapsed hoses,etc..

    I'd check with an accurate gauge before doing anything..the dash gauges are not known for great accuracy!..if its not peuking coolant out of the overflow,its probably not overheating...:crazy:
     
  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    X2

    My factory guages were so far off I might as well have had idiot lights instead...

    Rene
     

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