no heat 2000 escort zx2


cris8746
01-22-2010, 07:06 PM
A 2000 escort zx2 has no heat inside. The engine is warm with warm heater hoses but no heat inside. I can change the air flow through the different vents and the AC works but I can't get any heat at all.
cris8746

consultIII
01-22-2010, 08:56 PM
check for:

1. low coolant levels...check in resevoir and or rad tank...if low perform coolant pressure test to find leak.

2. stuck temp blend doors...believe your temp door is cable actuated. the cable should move a complete range of motion without binding and you should hear a kathunk at the end of travel as the door closes.

3. check thermostat. the upper rad hose heater hoses should feel hot to the touch at normal operating temperatures. Most vehicles run between 80' C to 100' C. Easy way to check is with a Infrared temp gun.

4. check flow through heater core. I check with a temp gun. should get a minimum of 10'C temp drop from the inlet hose to the outlet hose.

Davescort97
01-22-2010, 09:49 PM
Welcome to AF!

There are a few possible causes for your no heat condition. The first check is to make sure the cooling system is warming to the correct operating temperature. A failing thermostat wiil be opening too soon or will be stuck open. This reduces heat to the heater. If the thermostat is okay check the flow of coolant to and from the heater core. A plugged heater core will cause one of the 2 hoses to be cooler than the other. A restricted or plugged heater core wouldn't be uncommon for an Escort of your age. If the heater proves to be restricted back flush the cooling system and heater core. Last is the possibility that there a is a control problem inside the heater box. There are blend doors that are used to blend and direct the air. If one of these blend doors is not operating correctly you heating system would be only a cooling system. The cable from the temperature control on the dash goes to a valve on the lower part of the heating system that is directly right of and about the same level as your gas pedal. Sometimes the cable will slip out. It's just on the left side of the heater box close to the carpet on the center tunnel housing.

cris8746
01-22-2010, 11:36 PM
Thanks for the quick reply. The thermostat and coolant had just been replaced to try to fix the problem. I will check the other items.
check for:

1. low coolant levels...check in resevoir and or rad tank...if low perform coolant pressure test to find leak.

2. stuck temp blend doors...believe your temp door is cable actuated. the cable should move a complete range of motion without binding and you should hear a kathunk at the end of travel as the door closes.

3. check thermostat. the upper rad hose heater hoses should feel hot to the touch at normal operating temperatures. Most vehicles run between 80' C to 100' C. Easy way to check is with a Infrared temp gun.

4. check flow through heater core. I check with a temp gun. should get a minimum of 10'C temp drop from the inlet hose to the outlet hose.

cris8746
01-22-2010, 11:38 PM
Thanks for the reply. I,ll look into it in the morning.Welcome to AF!

There are a few possible causes for your no heat condition. The first check is to make sure the cooling system is warming to the correct operating temperature. A failing thermostat wiil be opening too soon or will be stuck open. This reduces heat to the heater. If the thermostat is okay check the flow of coolant to and from the heater core. A plugged heater core will cause one of the 2 hoses to be cooler than the other. A restricted or plugged heater core wouldn't be uncommon for an Escort of your age. If the heater proves to be restricted back flush the cooling system and heater core. Last is the possibility that there a is a control problem inside the heater box. There are blend doors that are used to blend and direct the air. If one of these blend doors is not operating correctly you heating system would be only a cooling system. The cable from the temperature control on the dash goes to a valve on the lower part of the heating system that is directly right of and about the same level as your gas pedal. Sometimes the cable will slip out. It's just on the left side of the heater box close to the carpet on the center tunnel housing.

FordMan59
01-23-2010, 08:12 PM
The thermostat housing on the Escort has a plastic ball valve in it that is designed to melt if the car ever overheats and allows the coolant to by pass the thermostat helping eliminate the possibility of engine damage. If that ball has melted it's letting the coolant by pass the thermostat and probably not coming up to full operating temperature. If you remove the housing you should be able to hear the ball rattle inside the housing if it hasn't melted. If it has melted you need another thermostat housing.

cris8746
01-23-2010, 10:52 PM
I found the cable off of the heater box, thanks for the help. I was looking on the other side.
Welcome to AF!

There are a few possible causes for your no heat condition. The first check is to make sure the cooling system is warming to the correct operating temperature. A failing thermostat wiil be opening too soon or will be stuck open. This reduces heat to the heater. If the thermostat is okay check the flow of coolant to and from the heater core. A plugged heater core will cause one of the 2 hoses to be cooler than the other. A restricted or plugged heater core wouldn't be uncommon for an Escort of your age. If the heater proves to be restricted back flush the cooling system and heater core. Last is the possibility that there a is a control problem inside the heater box. There are blend doors that are used to blend and direct the air. If one of these blend doors is not operating correctly you heating system would be only a cooling system. The cable from the temperature control on the dash goes to a valve on the lower part of the heating system that is directly right of and about the same level as your gas pedal. Sometimes the cable will slip out. It's just on the left side of the heater box close to the carpet on the center tunnel housing.

mightymoose_22
01-29-2010, 05:25 PM
Is this problem resolved?

My guess, since you feel heat on the hoses leading into the heater core, is that the core is plugged up.

If you have not had any luck fixing it yet, try disconnecting the in/out hoses from the core (and quickly plug them so you don't drain all your coolant), and use a garden hose with very low pressure to see if water will pass through. You can try to flush the core this way by pushing water through both the inlet and outlet, but too much pressure can cause damage.... very expensive damage.

delliott0702
02-09-2011, 12:33 PM
should one hear the 'kathunk' upon turning the dial to heat or to cool?

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