Why are the hoses to the heater core cold?
But it sounds like a bunged up heater core…..or a massive air pocket blocking coolant flow into the heater core. With the engine cold and you’ve got reasonable access to safely disconnect your heater core hoses one at a time, disconnect one or the other and have a friend start the engine.
Is there an air lock in the heater core?
It sounds like you have a air lock in the heater core. follow this video to bleed the system . It also helps to turn the heater on high without the fan and also to raise the front end of the vehicle to help with moving the coolant through the engine. Repeatedly squeezing the rad hose also helps to push out air. Hope this helps
What does it mean when return heater hose is hot?
No heat, both heater hoses… If the return heater hose is hot normally that means coolant is flowing through the heater core and is not transferring heat to the air from the blower motor. It is best to use a laser temperature gun and know the exact temperature of the heater core inlet and outlet temperatures.
Why do I Run my heater core in the summer?
The fluid stays stagnant in the heater core in the summer and can cause gunk to build up. After I flushed out my heater core I run the heat once a week in the summer to circulate the coolant through the heater core to keep it moving. I haven’t had a problem since.
Why is only one hose goes to the heater core?
It also helps to turn the heater on high without the fan and also to raise the front end of the vehicle to help with moving the coolant through the engine. Repeatedly squeezing the rad hose also helps to push out air. Hope this helps Was this answer helpful?
No heat, both heater hoses… If the return heater hose is hot normally that means coolant is flowing through the heater core and is not transferring heat to the air from the blower motor. It is best to use a laser temperature gun and know the exact temperature of the heater core inlet and outlet temperatures.
It sounds like you have a air lock in the heater core. follow this video to bleed the system . It also helps to turn the heater on high without the fan and also to raise the front end of the vehicle to help with moving the coolant through the engine. Repeatedly squeezing the rad hose also helps to push out air. Hope this helps
How to repair a Sierra 3500 HD heater core?
On 3500 HD, Cab & Chassis, Sierra & Silverado: Inspect the temperature door operation. See SYMPTOM DIAGNOSIS under TROUBLE SHOOTING. Perform any necessary repairs. After repairs are complete, go to step 10 . 7. Turn engine off Backflush the heater core. Start the engine. Select the FLOOR mode. Select the minimum blower speed.
But it sounds like a bunged up heater core…..or a massive air pocket blocking coolant flow into the heater core. With the engine cold and you’ve got reasonable access to safely disconnect your heater core hoses one at a time, disconnect one or the other and have a friend start the engine.
What kind of car heater blows cold air?
This topic contains 14 replies, has 7 voices, and was last updated by Russell Sawyer 6 years, 8 months ago. I have a 2001 Hyundai Elantra and the vents blow cold air when the heat is turned on.
What to do if heater core is air locked?
I’d personally try to find the heater core return hose and disconnect it at the engine. Start the engine and look for coolant flow. Have the friend shut down the engine after you see some reasonable coolant flow. It’s a messy method, but it’s usually effective in purging trapped air if the heater core is air locked.
The fluid stays stagnant in the heater core in the summer and can cause gunk to build up. After I flushed out my heater core I run the heat once a week in the summer to circulate the coolant through the heater core to keep it moving. I haven’t had a problem since.
What causes a cold radiator hose to overheat?
You may finally be forced to purchase a new radiator after performing this leak repairs. A cold lower radiator hose will cause an overheating problem. The cause of this varies with the main culprits being a leaked hose radiator pipe, a faulty thermostat or hindered coolant circulation.
How to tell if a Sierra 3500 HD heater is hot?
Check the temperature of the heater inlet and outlet hoses by feel. (The air temperature around the hoses must be at least 85°F (24 °C). Does the heater inlet hose feel warm and the heater outlet hose feel cold? Go to step 10 . On 3500 HD, Cab & Chassis, Sierra & Silverado: Inspect the temperature door operation.
How to know if your Razer heater core is hot?
@razer1318 check your heater hoses and make sure they are not blocked and check where the hoses connect to ensure they are properly installed. WARNING: Avoid contact with moving parts and hot surfaces while working around a running engine in order to prevent physical injury.
Is the lower radiator hose hot or cold?
The upper radiator hose is extremely hot, the lower radiator hose is cold. The thermostat has been replaced 3 times now. They have all been put in boiling water, and they all opened. The car has been parked on an inclined and filled with coolant, been jacked up and filled, we’ve used the cap to vent, we’ve used the bleeder to vent.
What to do if your car heater core is failing?
The heater hoses should be inspected when replacing a heater core. Problems with the heater hoses can cause similar problems to a failing heater core and are less expensive to correct. Some cars will need to have the air conditioning system recharged, which can increase the cost of repair. Another problem to watch out for is worn engine mounts.