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!!!!!!
It sounds as if you have a blockage in your heater core itself. You can usually remove both hoses from the core at the firewall and using compressed air, blow backwards into the heater core until it is cleared. While you are there I would suggest changing the plastic elbows that come off of the engine if they have not been changed already as they are known to crack and cause problems. They are even remaking them in metal instead of the plastic.
Posted on Nov 14, 2014
Before disconnecting any hose shut heater off start engine and take a temp reading on both hoses going to the heater core if temp if the SAME in both hoses your core is not plug you may have problems in the blend doors if temp in hoses are too different just flushed with rad flush fill up use air shop no more than 18psi blow out and use garden hose to flush both ways good luck
Posted on Nov 15, 2014
Dan has it right Tracie. I run acid thru all the cores I clean. 1 part muriatic acid to 4 parts water. Pull the hose off the engine, blow out any coolant with air. Using a funnel in the hose pour in the acid. Let it set for about five minutes, then be really careful and blow it out. The I reverse the hoses and do it again. I do this until no more brown junk comes out the heater core. Works 90% of the times. Some cores are just to plugged up. Replace them. Be forewarned though. If you do not stay on top of what you are doing and let the acid stay in too long. The acid will eat thru the heater core. Flush it with water after you're done, blow it out, put it together and add coolant to the system.
Posted on Nov 15, 2014
It most likely is clogged. Try this get something like CLR, get it from Walmart or other places like Home Depot. Remove the hoses from engine an pour the liquid into the core. Let it set for some time an then wash out with water. It has opened a many clogged cores. Sometimes it works depending on condition of core. Give it a try it cant hurt at this stage.
Posted on Nov 15, 2014
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Posted on Jan 02, 2017
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
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
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
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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