95gp Posted October 30, 2003 Report Share Posted October 30, 2003 I've got no heat in my 95 Grand Prix with the 3100. So far we've replaced the heater core and made sure all of the doors are opening and closing. The only thing I can think of is we have the hoses messed up. I need to know which pipe on the heater core on the firewall is the feed and which one is the return. The feed for the heater core comes from the black pipe that comes off the water pump housing right?? Thanks Mike Quote Link to comment Share on other sites More sharing options...
Intimidatorz34 Posted October 30, 2003 Report Share Posted October 30, 2003 not sure about the 3100, but for the 3.4, the inlet hose comes from intake area whereas the water pump hose is the heater core outlet Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted October 30, 2003 Report Share Posted October 30, 2003 Is the blower fan working or do you not only have heat? - Erik Quote Link to comment Share on other sites More sharing options...
99RegalGS Posted October 30, 2003 Report Share Posted October 30, 2003 There could be an air pocket caused by a lac of coolant which would cause no heat. Quote Link to comment Share on other sites More sharing options...
95gp Posted October 30, 2003 Author Report Share Posted October 30, 2003 Blower works just blows out cold to luke-warm air. Coolant system is full and has been bled multiple times. Thanks for any more help Mike Quote Link to comment Share on other sites More sharing options...
bluegp Posted October 30, 2003 Report Share Posted October 30, 2003 I've got no heat You probably already thought of it, but did you replace the thermostat? Quote Link to comment Share on other sites More sharing options...
ShockTherapy Posted October 30, 2003 Report Share Posted October 30, 2003 yeah, i'm gonna go with a thermostat. Quote Link to comment Share on other sites More sharing options...
thedeef Posted October 30, 2003 Report Share Posted October 30, 2003 i had the same problem in mine and it was the thermostat. however, no heat is a good way to stay awake on those late-night drives during the winter :? deef Quote Link to comment Share on other sites More sharing options...
Slade901 Posted October 30, 2003 Report Share Posted October 30, 2003 Check to see if your Cruise Control works or not. Cruise Control and the Cold/Heat selector is tied together by a vacuum line. Quote Link to comment Share on other sites More sharing options...
95gp Posted October 31, 2003 Author Report Share Posted October 31, 2003 Cruise works. Thermostat has been replaced and it seems to work. Car runs right were it should at about 190. This thing has got me stumped. I had the heater core lines off and blew air through them. Some of the Bars Stop Leak that I had before came out. Now I know I'm getting flow through the heater core, but maybe it's still plugged?? The heat got hotter after doing this. Thanks Mike Quote Link to comment Share on other sites More sharing options...
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