Truck has a new thermostat. How can the upper radiator hose be hot and the lower hose be cold if coolant is moving through the system? If the coolant is not moving thru, then why doesn't the engine overheat.
2006-10-12 12:12:00 · 12 answers · asked by John S 1 in Cars & Transportation ➔ Maintenance & Repairs
the upper hose is hot because the water is coming from the hot Eng. the bottom hose is cold because the hot water is being cooled throw the radiator fins before it gos back in to the Eng. that's why they all it a cooling system, to cool the the Eng.
2006-10-12 12:15:27 · answer #1 · answered by mustang656 4 · 0⤊ 0⤋
Most heaters have a valve somewhere, this how they turn off the heat in summer. It could be stuck or there something wrong with the Temperature Switch, some use Vacuum Hoses and all the Switch do is route the Vacuum to do what your setting is for. I would try to check the Switches first as they should be easy to remove. Then try to find where the Valve located they can corrode in summer and not open when winter come.
2006-10-12 12:25:11 · answer #2 · answered by Snaglefritz 7 · 0⤊ 0⤋
If you are trying to have heat in the cabin of your truck you should try first to check the valve that is behind the engine it may be obstructed with rust or foreign material,the relief that your car does not overheat is a good sign, but does not reflect the performance of the heater core , against the firewall there is a valve connected to the exterior inlet and outlet hoses for the heater core ,check it out,good luck.
2006-10-12 12:23:08 · answer #3 · answered by delmy d 3 · 0⤊ 0⤋
If you smell anitfreeze in the cab when the heat is running, then maybe. Firstly I would do a flush/fill on the system, replace the thermostat, and then check for heat. If no heat start looking under the truck and in the passenger floor for wetness, you have a bad heater core, or just replace it anyway when you do the flush/fill
2016-03-28 06:54:07 · answer #4 · answered by Marie 4 · 0⤊ 0⤋
is the thermostat in the correct way? if yes, then try back flushing the radiator. if you do it yourself, you have to remove the radiator of take it to a garage and have them do it. its not overheating because there is a heater core bypass hose that lets some circulation occur
2006-10-12 12:22:11 · answer #5 · answered by oldguy 6 · 0⤊ 0⤋
could be your new thermostat is stuck closed or there is a blockage in the radiator itself. you have blockage somewhere which is indicated by 1) no heat 2) lower hose being cold.
They missed something when they installed all that stuff.
2006-10-12 12:15:21 · answer #6 · answered by Mike C 4 · 0⤊ 0⤋
did it have some heat prior to the thermostat, rad and heater core? has it been overheated recently? was the cooling system bled to rid the system of trapped air? if so so could be a cylinder head and/or gasket problem
2006-10-12 12:38:37 · answer #7 · answered by douglas m 1 · 0⤊ 0⤋
either your new thermostat is bad or the water pump is out, but either way it would try and overheat on you. Are you sure the temp sensor is working?
2006-10-12 12:33:51 · answer #8 · answered by Slappin 3 · 0⤊ 0⤋
Check the fuses in the box at the right far corner.
2006-10-12 12:17:19 · answer #9 · answered by abel_6532 1 · 0⤊ 0⤋
you have atmospheric air in your cooling system, its the equivalent to vapor lock. you have to bleed the air out. you have to charge your cooling system. if you are able to replace cores and such, this should be elementary.
2006-10-12 12:23:02 · answer #10 · answered by Anonymous · 0⤊ 0⤋