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Thread: Engine temperature

  1. #11
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    Apr 2019
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    Arlington
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    Thanks Joe. We have family in town this weekend or I would drive out and say Hi! Good luck on the CC.

  2. #12
    Join Date
    May 2012
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    Beverly Hills
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    I've never seen or heard of the engine temperature increasing with Prevost's Dash Air on. In fact, most note lower temperatures given on most model years the fan clutch is engaged in the high speed setting with the air on.


    Gil and Durlene
    2003 H-3 Hoffman Conversion

  3. #13
    Join Date
    Jan 2006
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    Pinehurst
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    Without the dash air off we will cycle up to 210 and then drop back down to 190 and then start all over again. With the dash air on (fan locked in) we rarely get above 205 unless we are pulling hills and most of the time are in the 185 to 195 range.

    Loc - 2008 Marathon XLII - Houston

  4. #14
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    Mar 2013
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    Chicago
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    I still think once u get north of 95 outside things change.

    Next time someone is out in 95°+ with a dash air only chassis we need to know how it does.
    Last edited by Joe Camper; 08-07-2019 at 02:26 PM.
    1990 Peterbuilt 377
    3406 B Caterpillar
    13 Speed Roadranger
    No Norgrens


    1 day on paper no machines

  5. #15
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    May 2012
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    Joe, I've been there many times and still don't notice any increase in engine temperature. Of course, if I'm climbing a hill and trans temp rises, so does the engine temp.


    Gil and Durlene
    2003 H-3 Hoffman Conversion

  6. #16
    Join Date
    Mar 2013
    Location
    Chicago
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    Okay so I just went back to the current post that revived This Thread and he says I quote it was 97 or 98 and I was in the hills and it got to 215 I'm trying to assure him that there's nothing wrong with his bus those were within parameters for the conditions he was running in. can we agree on that?
    1990 Peterbuilt 377
    3406 B Caterpillar
    13 Speed Roadranger
    No Norgrens


    1 day on paper no machines

  7. #17
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    Jan 2006
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    Pinehurst
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    950

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    We did a run from College Station to Houston (approximately 90 miles) yesterday. Outside temp was 102 with humidity to match (its hot but its a wet heat). I run 65 mph to 68 mph. The dash air was on the whole time. The engine coolant ranged from 184 to 189 (most of the time at 186). The engine oil temp ranged from 194 to 198 (most of the time 196). Finally the transmission temp ranged from 195 to 198 (most of the time 196). Even pulling a few small hills (southern Grimes County) there wasn't any change beyond the ranges mentioned. I did slow to 55 for a short stretch and that is when I got the low end of the range readings. I am not prepared to run the test in these temperatures without the dash air on for fear of divorce.

    Loc - 2008 Marathon XLII - Houston

  8. #18
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    Mar 2013
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    Chicago
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    Based on that input I'd have to conclude that Fred's bus and the Liberty I drove for a summer, both coaches are running way too hot. Loc u need to pic up the pace just a tic.
    Last edited by Joe Camper; 08-12-2019 at 09:58 AM.
    1990 Peterbuilt 377
    3406 B Caterpillar
    13 Speed Roadranger
    No Norgrens


    1 day on paper no machines

  9. #19
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    Jan 2006
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    Pinehurst
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    950

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    Part II - I ran from Houston to the Hill Country (4 hours) starting at 3 am last Friday. Outside temp was 79 degrees to 77 degrees and humidity was Texas (always ridiculous) and I was running at 65 mph (slow down and see something Joe). Interestingly enough the AC compressor didn't run the whole time and I had temps significantly higher than my run in 102 degree heat the week before. The coolant temp would climb to 209 and then fall back to 185 provided I wasn't pulling one of the hills around Lake Travis (on a long climb it hit 211 but never over). Trans temp stayed in the 205 to 212 range. Oil temp got as high as 212 but then would drop down to 198. I came back Sunday afternoon in 101 to 103 degree heat with the AC on and the temps never got above 205 on the same road.

    Loc - 2008 Marathon XLII - Houston

  10. #20
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    Mar 2013
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    Chicago
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    Thanks Loc. Seems like there is no Rhyme or Reason to some of your statistics. Repeating myself I drove a 60 series Prevo on a very very hot summer for two or three months and it ran at 210 constantly but it never shut down and it never overheated that's where it ran.
    1990 Peterbuilt 377
    3406 B Caterpillar
    13 Speed Roadranger
    No Norgrens


    1 day on paper no machines

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