Heater core hose temperature difference Oct 17, 2023 · So make sure the heat is set to a high temp and the blower is set to high before comparing the coolant hoses for a temp difference. NOTE: When doing this inspection, turn the HVAC blower fan OFF. That streams into the heater core. Suffice it to say, a heater core is a really important part of your vehicle’s HVAC system. He reversed the normal "IN" and "OUT" hoses. People often ask, which hose is the inlet to the heater core? The answer is a heater hose. (The air temperature around the hoses must be at least 85°F (24 °C). 13. This replacement HVAC heater hose assembly is engineered to match the fit and durability of the stock heater hose assembly on specified vehicles. The heat from a heater core comes from the engine so its has to be warm to generate heat in the cabin. Problems with the heater hoses can cause similar problems to a failing heater core and are less expensive to correct. that would suggest either a clogged or leaking core IMO. So if you are up to operating temperature, those hoses should be anywhere from 180-220 degrees If they are not, there is a coolant flow issue. If the outlet heater hose is significantly cooler than the inlet hose, the heater core is probably clogged. Check service Mar 15, 2023 · It’s important to know which is which so you can properly diagnose the issue and potentially unclog the heater core. com Jul 20, 2023 · The heater hoses pass coolant from the engine to the heater core. And then there should be a hose that directly runs to the reservoir of the cooling system or the radiator. If the inlet hose is close to the engine temperature e. Here’s how it works: As the engine runs, it generates heat. Place a drain pan under the area to catch any spilled coolant. If the engine is cold, the heater core will struggle to heat. If lower is still cold after getting to operating temp. How hot should heater core hoses be? Check the temperature of the heater inlet and outlet hoses by feel. Using a thick cloth or gloves, touch the heater hose IN and heater hose OUT by hand to feel the temperature. Not only that, your heater core plays a huge role in defogging and defrosting your windows, making it a critical safety feature too. It is designed to withstand extreme temperature changes to extend service life. This is the outlet from the heater core. Oct 30, 2021 · Someone on another site (not us) swears that swapping heater core hoses from one side to the other made a huge difference in temperature output. This goes to the inlet side of the pump, through which it returns to the engine. One way to tell if a heater core is partially plugged up is to locate the heater hoses that carry coolant to the heater core. Disconnect the flush kit outlet hose from the heater core. If the heater core does not have a blockage/restriction, inspect the blend door/temp. Typically, the inlet hose should be about 20 degrees warmer than the outlet hose. You can rule out a leaking core if you pressure test the cooling system, then go from there. The heater core is located inside the dashboard and uses hot coolant from the engine’s cooling system to heat the vehicle’s cabin. Use a Thermometer: Insert a thermometer into the heater core inlet and outlet hoses. Feb 11, 2024 · The outlet hose is the larger of the two hoses, and it is located on the side of the heater core farthest from the engine. The heated coolant then warms up the air and circulates it through the interior of your car. That said, a significant temp difference between the driver and passenger side is symptomatic of a clogged heater core as noted in this Honda TSB. You’ll likely lose some coolant during this step. Due to heat exchange in the core. 5. Nov 21, 2010 · Upper should be warmer than the lower. On his vehicle they were both 5/8" so it was easy. :thumbup: Jan 14, 2022 · The heater hoses should be inspected when replacing a heater core. Heater hoses usually cost less than coolant hoses. If there is an obvious difference in temperature between both hoses, the heater core may be clogged. Jan 19, 2020 · Another quick way to check for a clogged radiator is to ask someone to rev the engine while you are squeezing the radiator hose. Remove any remaining water from the heater core as follows: • Disconnect the flush kit inlet hose from the heater core inlet. Sep 16, 2024 · 4. Does the heater inlet hose feel warm and the heater outlet hose feel cold? Nov 14, 2014 · 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. Connect clear hoses to the leads and use an adjustable hose nozzle with and attachment for the hoses. Remove both hoses from the heater core tubes at the firewall. Mar 14, 2011 · There should be a temperature differential between the inlet and outlet of the heater core, but it should be highest with the fan on high (extracting heat from the heater core). Oct 28, 2020 · Check the temperature of the heater core hoses: Both hoses should be too hot to hold. This basically keeps note of the coolant. Could a bad thermostat cause no heat : Inspect heater hose IN and OUT for temperature difference. See full list on wisdomanswer. actuator for failure or a broken actuator door. 15. One carries hot coolant to the heater core, the other returns it to the engine. If simple tests reveal leaks, flow problems or inadequate heating, a heater core replacement is likely needed. Nov 14, 2024 · Anyone wondering which hose is inlet on heater core can observe the one that goes towards the water pump area. If one hose is hot and the other (return) is just warm or cool, remove both hoses from the heater core or engine and flush the heater core with water from a garden hose. g. If the heater core outlet hose is ~10-25 degrees less than the inlet, the heater core is dissipating heat. If both heater hoses are hot and there is still a lack of heating concern, then the fault is most likely due to an airflow blend door malfunction. 14. Part of my auto shop's troubleshooting noted using this method and confirmed that there just wasn't enough circulation going on and there was a big temp difference between the two hoses. This was after a good flushout. 190-210o, the thermos Nov 28, 2010 · I measured temperatures with my IR temp gun and this is what I came up with: With the heater at full blast: The upper (larger) hose leading into the heater core is around 169* F. Some cars will need to have the air conditioning system recharged, which can increase the cost of repair. With the heater completely off: The upper hose is now 144* F and the lower is now 140* F. What is a heater hose? A heater hose is a small hose in a car that transfers the excess heat produced by the engine to the heater core in the form of coolant. Lead one end of the hose outside the engine compartment as a drain and pump water through the other end. Jan 4, 2018 · Check the temperature of the heater inlet and outlet hoses by feel. Oct 15, 2023 · There should be a difference between the hose feeding the heater core and the return hose. If the coolant level is low this will reduce the heater core's temperature. Typically, the lower hose is the inlet hose and the upper hose is the outlet hose when it comes to the heater core. Jan 29, 2023 · In other words, a heater core lets you stay toasty as you drive, regardless of the temperature outside. Jul 8, 2024 · How a heater core works. Type of heater hose. There could be a heater control valve in it as well. A car’s heater core is connected to the radiator; in fact, it functions similarly to a small radiator. Nov 26, 2024 · If there's a huge temp difference between your 2 hoses going to the heater core, your core is definitely plugged. Can you use a laser pointer temperature gauge and measure the exact temperatures? Last edited: Oct 25, 2023 Oct 15, 2005 · 1987 - 1996 F150 & Larger F-Series Trucks - One Hose Is warmer then the other - I have no heat and recently I have changed the t-stat and the Heater core. STEP 3 . at outlet is 50°-80°F cooler than inlet, inspect the heater core for a blockage/ restriction. The other hose connects to a metal pipe that runs horizontally to the front of the engine. When this happens, both heater core hoses should be hot. If coolant is leaking from the inlet hose, then the problem is most likely with the heater core. Any amount of “stop leak” may cause a loss of heat produced by the heater core. If you have a hot input and a lukewarm output with the fan 'off', then you have a flow issue with your heater core in some fashion. If temp. Feb 21, 2017 · The water pipe (goes across the top of the engine) is the source of the hot coolant for the heater core. • Apply compressed air into the heater core inlet with an air chuck until little or no water is coming out the outlet hose. but When I start it up and idle it for several min the hose from the water pump to the heater core is warm but the other one comming back out is not. Jan 3, 2025 · Locate the two heater hoses where they enter the firewall on the engine side. Another problem to watch out for is worn engine mounts. The lower (smaller) hose leading into the heater core is around 133*F. You can also use markings like arrows to determine which is which; the arrow away from the heater core is the Dorman Products - 626-001CD : Engine Heater Core Bypass Kit. Flush Cooling System: If other components seem to be functioning properly, flush the cooling system to remove any sediment or debris that may have accumulated. What I did to solve this problem is, remove input and output heater hoses from the firewall. A significant temperature difference between the two hoses suggests a blockage. If the heater core outlet temperature is significantly cooler than the inlet, then the heater core may be clogged/restricted and require and flushing the hoses and heater core. Discover more answers Oct 22, 2023 · Closely inspect the hoses and fittings for leaks, monitor hose temperatures, and use a thermometer to check for temperature differences. They are two black hoses approx one inch in diameter at the rear of the engine going into the firewall. vphd eojwm lbmg qsvnyu qzeaj hrqcd fdwa exhl lssc lnyittg