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jsome
Active Member
15 Posts |
 Posted - 09/01/2016 : 2:20:40 PM
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| I have a 2011 D3RE all American Bluebird with cummins ISC 8.3 300HP 60,000 miles this is the forth time in three years that the heater core as gone out(blown out from to much pressure leaking coolant). what should I do so that I am not replacing the heater core next year??? Looking back at old maintenance records they have replaced all heater hoses and thermostat. Thanks in advance for any thoughts you can give me. |
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Ryan5r
Senior Member
USA
55 Posts |
Posted - 09/02/2016 : 04:16:04 AM
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| Have you replaced the cap? |
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bwest
Administrator
United States
3820 Posts |
Posted - 09/02/2016 : 05:32:00 AM
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| Have you checked the radiator cap? Also, I wonder if the acidity of the coolant is off. Just some thoughts. |
Bryan |
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jsome
Active Member
15 Posts |
Posted - 09/02/2016 : 06:05:47 AM
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I will check the cap and acidity, good thoughts, thank you.
I talked to one bus co. they said to remove T K bypass. what is this??? |
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bwest
Administrator
United States
3820 Posts |
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jsome
Active Member
15 Posts |
Posted - 09/02/2016 : 09:38:49 AM
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| Thanks, @bwest very interesting, I will look into this. A little more info for everybody : At 22625 miles the heater core was replaced the first time. 2nd time at 30384 miles, 3rd time at 51403 miles and now at 60485 miles.I still would like to know what the TK bypass is. |
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Thomasbus24
Administrator
USA
4544 Posts |
Posted - 09/07/2016 : 04:54:19 AM
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| I asked a service guy at my dealer, he has no clue what a TK bypass is. Is that like a muffler bearing? |
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slippert
Top Member
USA
630 Posts |
Posted - 09/07/2016 : 06:50:01 AM
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| I think of Thermo-King when I see TK ... not sure what above is related to...? |
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Thomasbus24
Administrator
USA
4544 Posts |
Posted - 09/07/2016 : 07:21:02 AM
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| Oooohhhh...now that's a thought. Out of my league though. |
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slippert
Top Member
USA
630 Posts |
Posted - 09/07/2016 : 08:03:25 AM
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| Out of mine to ... I have 20 buses in my fleet that have TK air on them...never heard of a bypass for them... Maybe Trans Kooler..:-) |
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jsome
Active Member
15 Posts |
Posted - 09/08/2016 : 2:37:11 PM
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Thanks for the humor. The TK bypass utilizes a restricting plug in the forward water jacket,forcing a higher volume of coolant through the transmission cooler (also through the heater circuits and radiator) and "bypassing" the thermostat. the purpose of this bypass is to prevent excess heat buildup in transmissions equipped with retarders. the adverse side effects of this bypass kit are:higher heater circuit pressures, longer warm-up periods, inability to reach operating temperatures in cold climates,poor heater performance in cold climates.
So not like a muffler bearing. |
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krmvcs
Advanced Member
362 Posts |
Posted - 09/09/2016 : 07:22:27 AM
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| so what does the "TK" stand for. i remember the m11's in gillig transit buses had those. and when you saw one come in with weird cooling system related issues and a new water pump, you could be about 99% sure someone forgot to (or didnt bother) to stuff that fat washer into the new hose. |
-Ken- |
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Thomasbus24
Administrator
USA
4544 Posts |
Posted - 09/09/2016 : 07:30:29 AM
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Like slippert said, transmission kooler LOL
That would explain why my guys here never heard of it...no need for a transmission retarder in our location. |
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jsome
Active Member
15 Posts |
Posted - 09/15/2016 : 1:03:31 PM
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| For anybody else that has this problem BB will pay for parts and labor for TK bypass if done at authorized cummins repair facility and eng. and trans will still be under warr. |
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heater core leaking
