Question about 1996 Ford Fiesta

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Heater problems recently changed themo and control valve (situ behind bulkhead)worked well until 2 weeks ago, now will heat up very slightly at first then will actually cool down despite heater control on full.

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Did you check the coolant level. Is the engine temp. Up to spec.

Posted on Nov 25, 2013

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Posted on Jan 02, 2017

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SOURCE: heater blowing hot even after changing bulkhead valve no air-con

Theres a door under the dash that directs air over the heater core if it is broken then you will not get heat but you will still have a/c.To fix it you will have to take dash apart.
please rate my answer if satisfied

Posted on Jul 03, 2009

  • 116 Answers

SOURCE: The heater on my 2001

The cooling system most likely has an air pocket and the heater is the highest point so the air collects there and no heat is the result. Burp the coolant system of all air. Sometimes you will have to raise the radiator fill neck higher than the heater core.

Posted on Jan 18, 2011

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1997 Taurus ford GL 3.0,6cyl. Heat runs cold to


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Theres a door under the dash that directs air over the heater core if it is broken then you will not get heat but you will still have a/c.To fix it you will have to take dash apart.
please rate my answer if satisfied

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No heat from heater in front, rear heat works fine, engine is hot


Hello

I recently had a simular problem...try to follow the heater hoses that come from the engine and go into the firewall to the heater core... one of the 2 hoses connects to a plastic valve right before the firewall. This valve shuts off the flow of hot coolant into the heater core when heat is not needed.. Look carefully at this plastic valve, there is a wire pull cable with a small loop at the end that connects to a lever on the valve. Have a helper work the heat controls and make sure the cable pulls on the lever at the firewall valve...I've seen some cables disconnected. Hope this helps with your diagnosis.

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1998 jeep cherokeesport


Follow these steps:

Check coolant level, then start engine until it is warm and the thermostat opens. You will tell when it does when the needle on your temp gauge goes cold when it reaches around 180-200* and then goes back up. Now turn on your heater full blast and go to the engine compartment. You will see a heater valve located on the passenger side, next to the washer reservoir. It is a black thing with 4 heater hoses connected to it. Feel the hoses. When everything is working correctly it should be like this:

Hose going to waterpump will be hot
Hose going to (I think the thermostat housing) will be hot
2 Hoses going to heater core (mounted behind firewall) will be hot

1. If only 1 heater core hose is hot, heater core is clogged--
UNCLOG: remove 2 hoses going to heater core when engine is cool, hook water hose end to one of the sides and flush out gunk from heater core. Reconnect hose and you should be good.

2. If neither hose core hose is hot, heater control valve is bad or vacuum is bad--
Test Vacuum: remove vacuum line from heater control valve, you should feel the vacuum **** on it when pressed to your cheek and the heater control valve actuator should move when you unhook the vacuum line. If you have a good vacuum, it's probable the valve available at autozone part # 5941 for around $21.

To get heat while you wait to replace part, unhook silver arm on heater control valve that is hooked to the plunger. This will give you heat all of the time, but it is controlled by the bottom hot/cold switch on your heater control unit so you won't get hot in the cab. It will just circulate heat through the core.




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