Pontiac Repair: 1992 Pontiac Cooling system, heater hoses, baffel

Question
The heater in my 1992 3.8L Bonneville doesn't work.  I have changed the two hoses, heater core, and water pump to no avil.  When the engine heats up (200), the lower hose is so hot you can't hold on to it.  The upper hose is cool, but when you hold both hoses and rev the engine, you can fell both swell with pressure.  I have flushed both the engine and core, both shoot coolant out of the opposite connection, so there is no blockage.  Theromostat is working fine, opens at 220.  If I run the engine at 3,000 RPM some heat is felt.  Is there some sort of baffel inside the engine which is missing or misplaced which pressurises both connections?  There seems to be little to no coolant flow.

Answer
Hey Gary:

Does this enine over heat? the coolant from on that engine is hot out on the top hose to the radaitor and the cooled coolant back into the engine out of the radaitor back into the engine. From what you are telling me this is backwards. did you get the correct water punmp for this engine? is the belt routed correctly that the pump is turning in the right direction? were all of these parts changed looking for a no heat issue or did it crop up after replacing one of the parts? how about the heater hoses are they getting warm ? they should be close in temp. one should not be cold and one hot they should be pretty close in temp afetr the car warms up. If the hoses get hot or warm you should have heat and then I would tell you to look for a temp door issue in the car. that's at least a place to start. good luck and if you have any more questions just send me an update.


if you don't give me the correct information how am I going to give you the right answer. Please rate the answer fairly! I gave you an answer in mis information.

To re answer your question with the revised information you gave me no. ther is no flow restrictor to the heater core after the engine is up to temp the hoses should be close in temp. if not then there is a restriction in the core it's self. at first there will be a temp difference but when up to opertaing tem ther should not be that much of a temp difference especially if the fan if on high. the lower the fan temp the bigger the difference. when the air flow is fasy the temp can's be exchanged from the core as easily when it's going by it fast the slower the fan speed the better the heat transfer is from the core to the air in the car. alos like I sated before ther could be an issue with the temp door inside the HVAC box that the door is not moving all the way to the full hot position.