Heater core?

Hi Jerry,

It is not necessary and I would not recommend any radiator flush if there is coolant in the system now.

When heater is not functioning correctly, you should check the hoses to the heater core and ensure both are hot when in operations.
It could be due to the vacumn solenoid or hoses that are causing the heater valve not to open fully.

You are right about the location of heater box. Out under the hood there is a vaccum line that comes from the vaccum canister into the cab if that line is broken it won't let the doors work check that first.(NOS)

Hi there,
Does this smell of coolant? Get the cooling system pressure tested and have the condenser drain tube check for blockage, if the coolant level is low it will be a heat core problem, but have the pressure test to make sure.

Mark (mhpautos)

HEATER CORE REPLACEMENT

NOTE: The heater core can be removed without removing the heater assembly.

1. Drain coolant at the radiator.
2. Remove evaporator (air conditioned models).

3. Remove the heater pipe cover and heater pipe clamp.
4. Remove the heater core retaining plate.
5. Pull out the cotter pin of the joint hose clamp and separate the heater pipes.

NOTE: Coolant will run out when the heater pipes are disconnected; drain it into a clean drip pan.

6. Pull out the heater core from the heater housing.
7. Install in reverse order of removal, and:

o Replace the joint hose clamps with new ones.
o Turn the cotter pin of the joint hose clamps securely to prevent coolant leakage.
o Loosen the bleed bolt on the engine and refill the radiator and reservoir tank with the proper coolant mixture. Tighten the bleed bolt when the trapped air has escaped and coolant begins to flow from it.
EVAPORATOR REPLACEMENT

1. Disconnect the battery negative terminal.
2. Recover the refrigerant.

3. Disconnect the receiver line and suction hose from the evaporator.

CAUTION: Cap the open fittings immediately to keep moisture and dirt out of the system.

4. Remove the grommets.
5. Remove the glove box and its frame by removing the 5 screws and 1 bolt.

6. Loosen the right sealing band and slide it to the left.
7. Remove the screw in the outside air door diaphragm (leave the diaphragm attached to the air door arm) and the blower mount bolts, then remove the blower.
8. Remove the left sealing band and disconnect the wire.
9. Remove the three bolts and remove the evaporator.
10. Install the evaporator in the reverse order of removal.

o If a new evaporator, add 30 cc of refrigerant oil to it before charging.
o Remember to install the left sealing band and tighten the right band securely to prevent air leaking past the joint.
o Apply sealant to the inside and outside mating surfaces of the receiver line and suction hose grommets.
o Charge the system.
o Test performance.

That's what i have.

Hi laupe2006,

Check if you are losing coolant, if not, it should not be the heater core.

Most probably it is the evaporator from the AC. It might have been contaminated by fresheners that you have use in the car.

To remove the heater core you need to remove the dash assy and it would take quite some time, sorry I don't have the FRT.

White smoke from the exhaust is a sign of burning engine coolant. Normally that's due to a leaking cylinder head gasket, but given all the other things you described, it's more likely coolant is leaking in through the intake manifold. It sounds like it leaked in slowly overnight.

Hello, I'm Danny.

Here is a tutorial showing a basic remove/replace of a heater core:

https://www.2carpros.com/articles/replace-heater-core

I've attached step-by-step pictures below for your Honda Accord.Hope this helps and thanks for using 2CarPros.

Danny-

Sounds like you have a failed heater core. The dash will have to be removed and the plenum removed to access this. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

I am sending you some info on heater core and how to do the job. Yes I believe that is a drain.