05 Honda Odyssey heater only works after low


Why does my heater only work sometimes?

Usually, the root cause of the problem is that the thermostat is malfunctioning or improperly set. The function of your HVAC’s thermostat is to regulate the amount of heat that’s generated by your furnace as well as when that heat is generated.

Why does my heater stop working when I stop?

Causes of a breakdown



A heater can stop working for a number of reasons, including: A low antifreeze/water level in the radiator due to a leak in the cooling system. A bad thermostat that isn’t allowing the engine to properly warm up. A blower fan that isn’t working properly.

Why does my heat only work while idling?

Your Thermostat is Stuck Open



If the engine does not warm up as it should due to a stuck open thermostat, the heater won’t be able to build up the warmth needed. The result: your car’s heater may stop blowing hot air — idle or otherwise.

Why does my car heater only work when I rev the engine?

That is perfectly normal. However, if the heater only warms up when you rev the engine, that is a sign a component is amiss. One of which is the heater core. Although the thermostat greatly affects the engine temperature, typically, the engine will overheat if it’s deficient.

Why does my car heater sometimes work and sometimes not?

Dirty or low engine coolant can make it so your car heater works only periodically. If you’re experiencing on-again, off-again performance from your heater, this could be a sign you need to have your engine coolant inspected.

Why does my heat not work sometimes?

Dirty and clogged filters are one of the primary causes of furnace problems and can cause high operating costs. The heat exchanger can overheat and shut off quickly when filters are clogged with dust and dirt. This also causes soot buildup on the heat exchanger, which makes your furnace run less efficiently.

How do u know if your heater core is bad?

Five Signs Your Car’s Heater Core Is Going Bad

  1. Fog Inside Your Car. Two things could be going on if you have fog inside your car. …
  2. Sweet Smells in the Car. The sweet smell in your car might not be your perfume or the donuts you’re taking to work. …
  3. Constant Engine Coolant Loss. …
  4. Cold Air in the Cabin. …
  5. Cold Cabin/Hot Engine.


How do you know if your thermostat is bad in your car?

Signs My Car’s Thermostat Is Going Bad or Has Failed Completely

  1. Odd Temperature Gauge Readings. Your temperature gauge should register cold when you first start your car and slowly build up to normal as the engine warms up. …
  2. Air Temperature Changes. …
  3. Coolant Leaks. …
  4. Strange Sounds. …
  5. Heater Problems.


How do I reset my heater?

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You're gonna come to a light switch it can be located on your left side of the furnace. Or on the right this happens to be on the right side.

Why do I only get heat when I accelerate?

Air is still trapped. Find the highest spot in the cooling system, and bleed air out from there. Bubbles always go to the top, so you have to let the air out there, OR you have to rev the engine way up so the air gets pushed along to the radiator or overflow fill.

Does the blower motor resistor control heat?

The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed.

When my car is idling the heater blows cold air?

Low Coolant Level



The coolant (usually a mixture of water and antifreeze) in your engine doesn’t just work to keep the engine from overheating: It’s also the source of heat supporting the heating system. If there isn’t enough coolant in your system, the heater core will blow cold air into your car.

Why does my car heater get cold when I stop?

A low coolant level in the tank represents the main reason why you don’t have hot air in the cabin, it is not just related when the engine is idling, however, this can be the reason why your heater blows cold air at idle. Completing the coolant level with the same type of coolant represents an easy and quick fix.

How do you unblock a heater core?

To clean the blockage, you need to flush water or air through the heater core. By doing so, the grime and dirt that’s causing the clog will come out through the inlet hose. Now, insert a water hose into the outlet hose. If you have access to an air compressor, you can use that to push out the coolant and grime.

How do you unclog a heater core?

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I'm going to show you how you can take off the hoses that go to the heater core attach this to the water hose blast it out and within a few seconds your heater core will be unclogged.

Will a radiator flush unclog heater core?

Yes, they are both cooling system components, and the same coolant travels through them. Flushing a radiator can help reduce the rust that passes through the heater core. The most effective way of unclogging a heater core is by flushing it with a garden hose.

Does a coolant flush clean the heater core?

After they will drain the system once more. Then they will wash out the area near the water pump, where there are a lot of little seals that, if cracked, can cause leaks and add even more debris to your cooling system. After another drain, your mechanic will wash out the heater core.