Car Heaters

I have had to replace the heating control valve on a few fiestas, it is very common. It can be found on the bulk-head of engine bay just below wiper mechanism. Its got a plug on the side and two pipes in and out the other side. They are roughly £17 from Ford dealers, I would not advise getting one from a scrappy, cos the ones I've had from good scrappies tend not to last very long and were only a few quid cheaper than new one. They are really easy to replace, only tool you will need is mole grips to squeeze the rings around each pipe. Do it when the engine is cold.

Hope this helps

Two problems that I can think of are you need to add some antifreeze or you need to replace the thermostat. Two problems that I can think of are you need to add some antifreeze or you need to replace the thermostat. Two problems that I can think of are you need to add some antifreeze or you need to replace the thermostat.

Check these faults first. leaks bust hoses wet at carpet under dash fan belt. Air blockage in water systems .Not enough water in system. water pump. If none of these cure problem cinder head gasket has gone

if the thermostate is stuck open it wont allow the coolant to reach a certain temp. which could cause the heat to not work to well.

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Blower Motor Resistor Pack defective. You can order the part from Rockauto.com. Lookup the part number on their website. There maybe two different part numbers one is with center counsel and one is without center counsel. GM direct wants 3 times as much for the part. They don't want you to do it yourself, so they charge what the dealer would charge for the part and labor.

Check for a broken or disconnected duct Check the operation of the vacuum actuated motors under dash Check the operation of the selector switch

Defective heater resistor pack.

I had a similar problem with my 2002 Siena 1.6. It was a faulty relay situated in the main fuse box alongside the steering column (can't recall which relay it was but the diagram on the fuse box lid indicates). It also affected my headlights on low beam.

Your heater core is bad and needs to be replaced. It's a pain. Here is how you replace it. Remove Center Console Cover 1. Remove screw on side, below back driver's corner of center console. 2. Remove ashtray. 3. Remove 4 screws behind ashtray. 4. Pull up on back (behind shifter) of center console to unsnap. 5. Continue pulling to unsnap three spots around heater control area. 6. Undo connectors. 7. Remove console cover. Remove Heater Control 1. Remove 3 screws on heater control. 2. Undo connectors. 3. Remove heater control. Remove Stereo 1. Ensure 4 screws at corners of stereo opening are removed. 2. Remove your stereo. Remove Center Console 1. Remove screw on bottom of armrest pocket, near front. 2. Remove carpet in bottom of center pocket between shifter and lumbar/mirror switches. 3. Remove screw at bottom of center pocket. 4. Remove 2 screws on sides of the center console near the back. 5. Remove 2 screws on front, top of console in front of shifter. 6. Undo connectors. 7. Remove center console. 8. Undo connector going to handbrake. 9. Undo 10mm ground bolt underneath the carpet strip running behind the shifter. 10. Route wires out from under carpet strip. Ensure they are loose from any bindings. Remove/Loosen Shifter 1. Manual: Remove 4 10mm bolts/screws holding rubber boot. 2. Remove boot. 3. Untuck rubber seal from around shifter base. 4. Remove 4 10mm bolts/screws around shifter base. 5. Remove shifter 1. Automatic: Remove 4 10mm bolts. 2. Undo connectors. 3. Slide/Tilt the shifter as far back as possible. Remove Driver's Underdash Cover 1. Remove 3 screws at bottom left and right side corners. 2. Remove screw underneath left switch cluster (cruise, driver's lights, etc). 3. Remove 2 screws under the hood latch release. 4. Pull hood latch release through the cover. 5. Unhook floor light. 6. Push down on back to undo the spring clamp around the steering column. 7. Remove cover. Remove Driver's Underdash Duct 1. Pull down to remove duct. Remover Left Switch Cluster 1. Pull out to unsnap cluster. 2. Undo connectors. 3. Remove cluster. Remove Gauge Cluster 1. Remove 2 screws at bottom corners of cluster cover. 2. Remove 5 screws spaced across front underside of cover. 3. Remove cover. 4. Remove 3 screws across top of cluster. 5. Undo connectors. 6. Remove cluster. Remove Driver's Kick Panel 1. Remove 4 screws along strip. 2. Remove strip. 3. Remove 2 screws on dead pedal. 4. Remove dead pedal. 5. Remove 10mm nut at front of kick panel. 6. Remove kick panel. Lower Steering Column 1. Remove 2 17mm nuts at either side of steering column (notice ground loop on right side one). Remove Glove Box and Covers 1. Remove 3 screws along front of passenger's underdash cover. 2. Remove underdash cover. 3. Remove 2 hinge screws at botton of glove box. 4. Unlatch glove box. 5. Remove glove box. 6. Remove 2 screws at top corners of glove box undercover. 7. Remove 2 screws at glove box latch. 8. Remove latch. 9. Loosen plastic hold down screw in center back of undercover. 10. Remove glove box undercover. Remove Passengers Kick Panel 1. Remove 4 screws along strip. 2. Remove strip. 3. Remove 10mm nut at front of kick panel. 4. Remove kick panel. Remove ECU 1. Remove 2 screws. 2. Undo connectors. 3. Remove computer. Remove HAC (on glove box hinge bar, if equipped) 1. Not sure how. The car I did the write up on didn't have one. If you do this, email the procedure to me and I will include it. Remove Anti-Slip Computer (if equipped) 1. Remove 2 screws. 2. Undo connectors. 3. Remove computer. Remove Dash Pad 1. Remove 10mm bolt/screw at bottom left corner of dash pad. 2. Undo big, green, rectangular connector by driver's fuse block. 3. Undo medium, blue, rectangular connector by driver's fuse block. 4. Undo medium, white, rectangular connector by driver's fuse block. 5. Undo big, square connector that attaches to driver's fuse block. 6. Unclip the speedometer cable connector. 7. Move speedometer cable connector out of hole. 8. Remove 2 10mm nuts on either side of speedometer cable connector. 9. Remove 10mm nut deep inside dash directly above the right nut in step 5. 10. Remove 10mm nut deep inside dash above and to the left of left nut in step 5. 11. Undo big, square, white connector to right of nut in step 7. 12. Remove 2 screws around heater control area. 13. Remove 10mm bolt/screw at bottom right of dash pad. 14. Remove 10mm nut above area ECU area. 15. Undo small connector to interior temp sensor above ECU area. 16. Undo medium, yellow, rectangular connector by where the wiring harness runs through the firewall. 17. Pull out on the dash pad about 2-3 inches. 18. Remove dash pad by tilting up and over the steering wheel and shifter. Remove Cross Bar 1. Remove 2 12mm bolts on left side of bar. 2. Remove 2 12mm nuts on left side of bar. 3. Remove 2 12mm bolts above the steering column. 4. Undo wiring harness clip behind bar above the steering column. 5. Remove brake pedal spring. 6. Undo 2 wiring harness clips from left of center arm. 7. Remove 2 12mm nuts at the top of the left of center arm (notice ground loop). 8. Remove the 2 12mm bolts at the bottom of the left of center arm. 9. Remove the arm. 10. Undo the wiring harness clip from the right of center arm. 11. Remove 1 nut 12mm nut at top of right of center arm. 12. Remove 1 12mm bolt at bottom of right of center arm. 13. Remove right of center arm. 14. Undo the wiring harness clip above firewall pass through. 15. Remove 3 12mm nuts on at right of cross bar attaching it to the bracket (not the 3 holding the bracket to the car). 16. Pull out on right side of cross bar. 17. Pull bar out the passenger door. Remove Heater Core Box 1. Undo heater hose under hood by heater VSV. 2. Undo heater hose under hood by the brake booster. 3. Undo 3 connectors on left of heater box. 4. Unclip floor heater ducts. 5. Remove 4 10mm nuts at the corners of the heater box. 6. Remove 2 10mm bolts/screws holding the heater box to the a/c box. 7. Remove 2 10mm nuts on top of a/c box. 8. Remove 10mm nut on bottom center of a/c box (may be under carpet). 9. Loosen heater box by pulling out on left side first (pull on opening directly on top of the heater box not the ones on the sloped part or the left side as this can break off the plastic tabs). 10. Remove heater box. Remove Heater Core 1. Remove 4 screws and clamps on top of heater box. 2. Remove the heater core.

Only blows cold air with the a/c on while driving, your cooling fan or fan clutch is bad depending on the year, make and model..........

Only blows cold air with the heater on while driving, you will have a bad or broken internal a/c - heater control door.....

circulating fan is probably not working when car is moving it works with outside airflow, check for blown fuse

Blower motor problems are common on GM products. If the fuse is good then the motor is probably bad. Using a 12V test light, check for current right at the motor. If there is current then you will need to replace the motor. If the motor works only on high, then the blower motor resistor is bad and will need replacing. I hope this helps you. Mark My ignition switch was bad. Wiggle the key in the switch and wee if the fan works! I had problems with my resistor twice. The resistor and fan motor are accessed from under and behind the glove compartment. so it is hard to get at. After replacing the resistor a second time I looked for a reason. The problem turned out to be a misplaced gasket located at the bottom of the windshield under the plastic cowling. The gasket wasn't re-installed properly at a local dealership when the car was in for a wiper recall issue. The misplaced gasket allowed water to flow down the windshield and directly into the heater fan housing, where the resistor is located. Incidentally - my warranty company refused to cover it stating it was water damage. Also, GM and the dealership refused to replace the motor or resistors which were damaged as a result of the shoddy workmanship at the factory, or at the dealership (or both). Come to think about it, I don't think I could even communicate with the manager at the dealership. I actually got into a verbal argument with the Service Manager, then the dealership owner didn't return my calls, or mail messages. I haven't been back to that dealership since.

A 2006 Dodge Ram does not have a cabin air filter.

Most (not all) cars are heated by the engine. When fluid moves through the engine it heats up. This fluid moves through the heater core, a fan moves air over the warm heater coils blowing warm air out to the cars cab.

The blower motor speed resistor is burned out.

Your car could be low on antifreeze or your heater core could be clogged.

With my car, it was Heater matrix clogged with radiator sealant. The workshop cleaned it and it's start working fine!

The water level in the radatior is lower than the inlet of the heater core. At idle the water flow is not high enough and the air bubble in the cooling system moves to the highest point in the system The heater core, Now hot water, no heat

Check your thermostat, when the car is sitting still it may not be getting the cerculation it needs

This can result from heater core blockage. If it is partialy blocked, you may notice a little heat with the fan on low, but it goes cool when the fan speed is increased. Other signs of blockage may include engine temperature fluctuation, and/or excessive pinging (pre-ignition). This can also be caused by the engine thermostat being stuck in the open position. Cracked heater core.

The line or core is probably plugged, or if it has a manual or vaccum switch check to see that it is not corroded. If it moves freely, I would find both lines to the core (heater), disconnect them and drain as best you can. I would pour some flush into the lines and let it sit in the lines/core for 15 minutes then attach a garden hose and flush the crap out. I usually install some cheap clear plastic tubing on the core/lines to let gravity help me and to direct the waste away. Remember to top off the rad.It will heat good then. I hope this helps you. Mark

It is located behind the bulkhead, accessible from the engine bay.

One of the reasons a 2000 Jeep Cherokee heater would randomly blow cold air and then hot air and then cold might be that there is a problem with the hot/cold duct. The air or a vent might be inadvertently blowing periodically.

It depends on the temperature opening of your thermostat most open at 180 degrees

This would indicate that the system is low on coolant when the gauge is hot. Not enough coolant to service the heater core.

Do you have a heat pump or Gas Furnace?

With my car, it was Heater matrix clogged with radiator sealant. The workshop cleaned it and it's start working fine!