At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
1997 grand cherokee, changed the dash control for the heat and air didn't work. the ac pump works but it won't switch from hot air to cold air. where is the resister for the flapers to get the ac's cold air.
System is vacuum controlled check for vacuum at the switch you replaced If it's there then check the blend door motor (moves the "flapper") If motor is good, then the door is stuck and heater box needs to be taken apart. If no vacuum at the switch, work your way back to the engine where vacuum originates to determine where line is broken or disconnected.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
If the air flow cannot be controlled from vent/defrost/floor you may have a blend door issue. This is an electric motor that operates a door in the heating system to control airflow. There are usually 3 motors controlling airflow direction,heat and recirculation. The Ac not blowing cold may also be another problem. If the AC is operational, the compressor will be engaged and the Ac low pressure line under the hood will bw cold. If this is all ok then a blend door issue should be suspected
There's a small motorized flap that's controlled by the heating and ac system that's gone bad. This part changes the air to flow from the ac or heating side depending on settings. I had a 1999 Jeep Grand Cherokee with the same issue, the fix is relatively simple once you get to it, however you must completely remove the dash to get to the part. The part is about 15.00. When removing the Dash you MUST disable the air bags, if you do not you risk injury or death if they are accidentally deployed.
Jeep Grand Cherokee is notorious for broken blend-air doors. This is the door inside the A/C-heater housing that switches the air from hot to cold. You must remove the dash to repair it.
Take a look under the dash at the heater/ac blend door(s) and cycle hot to cold on he dash heat control while asking for AC and the vehicle running.Do the doors move fully?
You may be able to manually help the door move to get cold air.
Check to see that the blend door linkage is hooked up. Doubtful it is heater core, as you had heat to one side and not the other. Check coolant control valve linkage, verify it is moving the coolant valve from off to on when you switch temperature from cold to hot. Verify you have coolant flow to the heater core by feeling the heater hoses where they enter the firewall. If all checks out well, then look at hvac controls individually.
Hi.in the dash there are flaps which control's hot or cold, those flaps break and then you will only have cold air blowing. You will have to remove the dash and renew those flaps
The control for the AC/Heater door isn't working. To have AC the door has to close so that the hot air is not being blown into the car. When this door is closed it allows the cool air to pass through. This is either controled by vacuum or a ele. switch
×