good luck. 
heater core pipes
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TECH Enthusiast
Joined: Jan 2007
Posts: 732
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From: OHIO
heater core pipes Does anyone know specifically which hose is which connecting to the heater core? My Z28 has no heat, I think the heater core needs backwashed. Anybody know which is the inlet and outlet?
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So you replaced the core and still have a clog?
If you blow into one of the heater hoses the coolant should shoot right out of the other line end. The ends that attach to the water pump.....
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If you blow into one of the heater hoses the coolant should shoot right out of the other line end. The ends that attach to the water pump.....
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Verdad Gallardo It's all done through the glove box but you have to take the glove box and bottom piece of that out. Easier than the 3rd gens!!! Still took me a night and half day to get through.
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TECH Enthusiast
Joined: Jan 2007
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From: OHIO
I tried backflushing my heater core because I had NO heat but I can't get the system bled out now. I got the theater core to flow full water bother ways. I disconnected the heater core hoses off the t-stat/waterpump area. I used compressed air and water to flush. I put the hoses back on filled the radiator with 50/50 dexcool and started her up. I can't get the system to flow though. The temp gauge went past 210 and both fans came on but I still had no heat. I don't know if the heater core is no good or not. Could a bad t-stat be the problem? I didn't get really bad stuff out of the heater core when flushed. Should I try replacing the T-stat?
TECH Fanatic
Joined: Jun 2006
Posts: 1,285
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From: Elgin, Il
4th gen heater cores are done through the glove box. Biggest PITA I had when I did my 93 Z was getting the damn hoses off the core under the hood.
I tried backflushing my heater core because I had NO heat but I can't get the system bled out now. I got the theater core to flow full water bother ways. I disconnected the heater core hoses off the t-stat/waterpump area. I used compressed air and water to flush. I put the hoses back on filled the radiator with 50/50 dexcool and started her up. I can't get the system to flow though. The temp gauge went past 210 and both fans came on but I still had no heat. I don't know if the heater core is no good or not. Could a bad t-stat be the problem? I didn't get really bad stuff out of the heater core when flushed. Should I try replacing the T-stat?
I tried backflushing my heater core because I had NO heat but I can't get the system bled out now. I got the theater core to flow full water bother ways. I disconnected the heater core hoses off the t-stat/waterpump area. I used compressed air and water to flush. I put the hoses back on filled the radiator with 50/50 dexcool and started her up. I can't get the system to flow though. The temp gauge went past 210 and both fans came on but I still had no heat. I don't know if the heater core is no good or not. Could a bad t-stat be the problem? I didn't get really bad stuff out of the heater core when flushed. Should I try replacing the T-stat?
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