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2001 chevy express 3500 shuttle bus 5.7L vortec - no heat

  

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Hi, the heater on my bus went out. I noticed the coolant was low and I filled it up. After that, there was still no heat so I found the lines that went into the heater core. After that, I let the engine warm-up, shut off the engine, and felt those hoses. Both of them were lukewarm. So now I'm wondering what my next step should be.

I hear that it could be a bad thermostat, but wouldn't the bus also overheat? I took the bus on a 2-hour camping trip and it was fine the temp was very stable so idk what I should do next. 

 

 

Thank you so much!


1 Answer
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try flushing the heater core with water


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