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Old 11-26-2012, 10:12 AM   #10
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,663
 

2003 L-Series 3.0L Sedan
Default Re: changed thermostat now i got no heat HELP!

I asked about hoses as one member, here or in another Saturn forum, eventually found out that he mistakenly switched heater hoses around and caused his own problem with no heat. When switched around, heater flow returned.

Saturns have full time heater cores - coolant flows all the time regardless of thermostat operation. Its been a feature for most cars not using an actual shut off valve to stop coolant flow through heater cores. Without a shut off valve to fail, GM can say that heater operation is almost instantaneous in cold weather. The heater core relies on the bypass hose and coolant flow configuration with the water pump to continuously flow engine block coolant through the heater core. The heater will warm up long before the thermostat opens for engine cooling.

You may have to remove the bypass hose and check it for clogging. Any chance that sealer was used?

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