Question about 1998 Chrysler Sebring

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Heater issues Hello! The temperature of my heater works awsome but it has steadily decreased in the pressure. It feels like maybe the vents on the side are clogged. Help!! 1999 Crysler Sebring Convertable. Thanks, keahieggers@hotmail.com

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New blower motor

Posted on Jan 01, 2009

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My 2005 GMC C7500 heater is not blowing hot air. The fan is working fine, but it seems we can'[t get it to switch to heat. We replaced the in dahs switch assembly thinking the switch just wasn't...


It is probably the blend doors in the heater case not opening correctly. They are probably vacuum operated doors.


Check the heater core by feeling both heater hoses (the inlet and outlet) when the engine is at normal operating temperature. Both hoses should feel hot, meaning the heater core is circulating coolant correctly. If only one hose feels hot, the heater core may be plugged up, or it may have an air block.

If the heater core checks out good, check the heater case doors for proper movement when you switch from cold to heat. Several vacuum lines branch out from back of the control unit to vacuum canisters on the case, which open or close the various doors. These doors used to be only cable operated, but most are now vacuum operated. There should be a single vacuum hose from the engine, into the firewall, and then to the heater control unit in the dash, where hoses distribute the vacuum signal to various doors or vents as demanded by the switch settings.

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2008 ford expedition front ac heater


I will try to answer and offer you a couple of choices based on 2 different potential problems.

The blower motor resistor is the control for both the heater fan blower and the A/C since they are the same blower motor. It is the boost that you need to feel either heat or A/C through the vents. The part can be traced from the heater blower wires under the hood to a control about the middle of the Firewall. 2 bolts hold it in place with 1 connector wire. But a heater line will likely block access to switching the part. It is often a part that tapping will start it working again.

Another A/C intermittent problem is low Freon. A certain pressure will engage the A/C compressor switch. Since outside air temperature can boost the internal pressure remaining in your A/C system, every time it expands the Freon; your system may work.

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Hello My heat stopped working on my 98 milenia. I replaced the thermostat and flushed the heater core. Still no heat. Someone told me about the heater box. Looked for it under dash by taking out glove box...


Does the blower motor still work?
Lift the hood after the engine is at normal operating temperature, and feel the two heater hoses going from the engine into the firewall. Both should be hot if the coolant is circulating through the heater core. If they are, one of the inner doors in the heater box may not be operating. The doors are either cable operated or vacuum operated from your heater controls. One door in the box should be open when heat is desired to let the blower fan blow air across the heater core, and then to the vents where heat comes out. The heater box is usually rather large, under the middle of the dash. Have someone check your temperature blend door- I believe that is the one that may be at fault.
Now if only one of the heater hoses is hot, and the other is cool, the coolant is not circulating through the core. Look for an in-line water valve on one of the hoses. These also may be cable or vacuum operated from the heater control head. Not all vehicles have a valve, just some do.

Oct 17, 2013 | Cars & Trucks

1 Answer

Heater not getting hot/


Check the heater core tubes (2 of them) at the firewall to feel if they are getting hot with the engine warming up to operating temperature.

If not, then the heater core may be plugged, and it will have to be flushed out or replaced.
If the tubes are hot, but the interior doesn't get hot then the blend door may be an issue, where the door won't allow hot air to circulate inside of the cabin through the vents or the defrost vents, or the heater vents.

Good luck on this repair.

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1 Answer

My 1990 Jeep Cherokee's engin temperature guage wont go above the minimum temperature unless it has been driving for about 30 minutes and even after it starts to slightly raise above that, i am still not...


your heater core may be clogged up. The temp of the inlet hose should be about the same as the outlet hose-under the hood. If one is signifcantly more hot then suspect a clogged heater core. You can try to back flush the heater core. Remove the heater hoses at the engine side- not the heater core side because the hose fittings are fragile. You want to blow through the hose that was cooler to the touch with light compressed air or water pressure. be sure to bleed air out of system. If water flowed freely through the heater core then you may have an issue with the blend door on your heater box, or heater control. Do not blow up the heater core! keep pressure below the psi rating of the radiator cap.

The slow acting of the temp gauge may indicate air in the cooling system. run the engine, heater on, with the radiator cap off to vent the system, doing this on an upsloped driveway will aid in venting the air.

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I have a 2000 jaguar s-type Climate control does work


Jaguar S-type 2000 fabrication year is equiped with:
1. Control system = Automatic temperature control
2. System layout = Single evaporator - dual zone
3. Refrigerant circuit type = Expansion valve
General information:
1. System control
1.1. Compressor operation controlled by refrigerant pressure sensor.
1.2. Compressor will not operate if refrigerant level is low!
1.3. System incorporates an A/C evaporator temperature sensor.
1.4. System incorporates an engine coolant heater regulator valve.
1.5. A/C control module incorporates self-diagnosis function.
1.6. The A/C control module fault memory can only be accessed and erased using diagnostic equipment connected to the Data Link Connector (DLC). See picture below:
91c2d77.png 1.7. Engine Control Module (ECM) incorporates A/C related trouble codes.
1.8. Malfunction Indicator Lamp (MIL) will iluminate if certain ECM faults are recorded.
1.9. The ECM fault memory can only be accessed and erased using diagnostic equipment connected to the Data Link Connector (DLC).
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B1200 A/C control module - internal failure
B1251 In-car temperature sensor - open circuit
B1253 In-car temperature sensor - short to earth
B1255 Outside air temperature sensor - open circuit
B1257 Outside air temperature sensor - short to earth
B1259 A/C sunlight sensor - open circuit
B1261 A/C sunlight sensor - short to earth
B1262 A/C heater defrost flap motor - short circuit, open
circuit, short to earth
B1263 A/C heater fascia flap motor - short circuit, open
circuit, short to earth
B1264 A/C heater footwell flap motor - short circuit, open
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B1265 A/C heater air mix flap motor - short circuit, open
circuit, short to earth
B1676 Battery voltage - voltage too low / high
B1946 A/C evaporator temperature sensor - open circuit
B1947 A/C evaporator temperature sensor - short to earth
B1966 Heater output temperature sensor 2 - open circuit
B1967 Heater output temperature sensor 2 - short to earth
B2428 Heater output temperature sensor 1 - open circuit
B2429 Heater output temperature sensor 1 - short to earth
B2477 A/C control module - incorrect programming

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1 Answer

Why wont the heater blow hot air, the core doesnt look clogged?


Hi


Thanks for using FixYa. Try and check if the heater core is plugged. Find the 2 coolant lines going to the heater core. They are right next to each other with approx 3/4" hoses going to the engine. Now, warm up the engine with the heater on max (don’t turn on the fan). Next, feel if the hoses are warm (maybe HOT!) If they are not warm, then you most likely have a plugged core. A back flush will resolve the issue. If your hoses are warm, turn on the fan. One hose should go cold (or cooler than the other, actually should be about the same temp as the air from your air vents, if there is a plug). If both hoses are hot and stay hot, and you have no heat, then the problem is not with the heater core but with the blend doors.


There are electric motors that operate the "blend doors" inside the dash directing air flow from the heater core and A/C evaporator core to the cab of the vehicle. If you feel a drastic difference in one of the radiator hoses, then try replacing the thermostat and see what happens. If all the heater and radiator hoses are pretty much the same temperature I would suspect a control problem in the dash controls or in the blend door operation. You’ll need to remove the dash to check these.


Please do accept the solution if the issue is resolved or else revert for further assistance.


Thanks

Rylee

Dec 27, 2009 | 1991 Mazda MPV

1 Answer

Heater not working


I would check if your vent to the outside is open. If it is I would check the vacum hose that controls the vent to open and close.

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