Question about 2006 Pontiac Grand Prix
The hose from the radiator to the engine block is reading just over 200 degrees but the inlet hose to the heater core is only reading just over 150 degrees. Since the coolant is running through the engine block before going into the heater core inlet hose, shouldn't it be reading at least the temp of the hose leading from the radiator to the engine block? The heat is not working well in the car, especially when it is below freezing outside, and we think it may be because there is a clog/blockage of the heater core inlet hose coming from the block. We have already replaced the water pump, thermostat, radiator cap and coolant temp sensor and we have had a coolant flush and fluid replacement done all within the last 2 weeks. I also did a manual reset of the HVAC actuator with no results. The heater core and blend doors seems to be working just fine. Please help!!!!!!
Heater hoses run from the rear of the block to the water pump. One hose into the heater should be hotter than the other because heat is transferred in the heater in the car. . The cooling system draws water from the bottom of the radiator ( water pump inlet)which is always cooler than the top hose and dispenses it throughout the engine and heads including the heater core. It is then pushed past the thermostat with all the heat from the engine to the top of the radiator where it is cooled down by the air passing through the radiator . Check that the air vent for the cabin is set to recirculated cabin air and not fresh air from the outside as it will require recirculated air to increase in temperature to work properly
Posted on Nov 14, 2014
Testimonial: "Well that's not true at all. And I am speaking of the heater core, NOT the water pump. There are hoses that run directly from the back of the engine block into the heater core and back. The heater core is located in the cabin behind the dash and you can clearly see all of the lines running through the firewall from the engine compartment. The heat used to work much better than it is now so there clearly is a problem that is not related to recirculating the cabin air......"
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Posted on Jan 02, 2017
SOURCE: car runs hot
CHECK YOUR RELAY IN YOUR FUSE BOX UNDER THE HOOD ON THE DRIVERS SIDE INNER FENDER. THE A/C AND THE HEATER RELAY ARE SAME. CHECK AND SEE IF THE A/C REALY WORKS BY TURNING ON YOUR A/C SWITCH. THE ELECTRIC FAN SHOULD START RIGHT AWAY. OTHERWISE YOU HAVE TO WAIT TILL THE ENGINE ACHEIVES OPERATING TEMP TO KICK THE FAN ON. IF ONE DON'T WORK AND OTHER OTHER DOES... SWITCH THE RELAY AND SEE IF IT WORKS. BEEN THERE AND DONE THAT. $9.00 FOR A NEW RELAY AT CHECKER AUTO PARTS.
Posted on Feb 14, 2009
Are you sure you got all the air out of the cooling system? Air pockets are very common problem when you do any work to the cooling system. An air pocket will do what you discribe.
Posted on Mar 18, 2009
Front of the engine...looking at the motor...to the driver's side of the alernator...looks like a spark plug almost...has a wire connector going to it. Trying to post the pic...but at least this is a good description.
Posted on Apr 05, 2009
1999 Grand Am Se 2.4L- We Checked The Relays And They Worked. Then We Checked All Fuses And They Were Good. But The Fans Still Dont Come On At 200 Degrees. When We Turn The AC On Both Fans Come On And Stay On After We Turn Off The AC Then When We Shut The Car Off They Dont Come Back On? And The Car Normally Runs At 180? Any Solutions?
Posted on Apr 04, 2010
SOURCE: My 2006 Pontiac Torrent cooling
Even if there were no hydrocarbons detected I am almost positive you have a bad head gasket.Usually the back head on the number one cylinder.Almost all the ones I have done with this exact problem has been the rear head and the number 1 cylinder.Hair line crack between the cylinder and water jacket.I always replace both head gaskets.Hope this helps.Good luck.
Posted on Mar 04, 2011
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