grand cherokee limited V8Problems:1) Left brake light is not working when the park lamps are on and aslo rear left park lamp goes off at same time. When the park lamps are off everything works fine. I understand that the problem is not the bulbs. 2) Passenger side always flows cold air :( I tried all the combinations ( Auto, manuel, a\c, lo, hi, 80f etc...) In all conditions the right side of the climate system flows cold air.Thank you very much, waiting for help...Oh! by the way front speakers blow in 2 days (tweeters)
Check all ground s. Frame to engine and frame to battery for clean, and tight, Check ground at left tail light. Check to see if heater duct to passenger side is connected. Have a fun day
on brake lights it sounds like you have a short in the circuit board for the left side light or the socket the bulb is in jeep sells the whole board with the lights in it it's pricey and for the air and heat problem sounds like your blend door is not working right go to a jeep dealer and they can hook it up to a scantool and work the doors from the scantool and tell you which one is not working right it will cost you but get it done right the first time
For the brake lamp issues it is probably the strips that screw to the back of the tail lamp housing. The strips hold the three bulbs for the rear lamps. I have seen alot of problems with these causing problems like this. Try switching the strips side to side and see if the problem changes or goes away for that side. With the heat issue if the coolant is full it is most likely the blend door for the passenger side, they like to break right at the actuator that move them for temp control. The actuator for the passenger side is on the back side of the hvac box against the firewall. The driver side actuator is right behind the glove box. Without removing the havc box and changing the blend door sub-assembly, there is no way to fix it permanently.
As far as the Brake light issue my first guess would be a faulty connection with a Grounding wire. They tend to be hooked to the frame or Body of vehicle in various places. A loose one or disconnected ground wire. Will cause this winking out trouble. Another way to notice this effect is if you can see any lights that seem somewhat dimmer than another. particularly a tail light lamp or park lamp. If so the dimmer one can be the side thats is not getting a secure ground. When this occurs. the lamp can still lite but it is now lighting by having the power of another lit bulb drawing the power throuh it. The climate control system might be a Stuck control door / or a solenoid controling a door inside the plenum of the Air duct system. But if you have the most recent version of a new vehicle. several items like this can be having troubles due to a Computer Module not talking right with the system. I Test drive For Ford Motor in the Desert of Arizona we do a lot of Climate Control evaluation. With luck it may very well be a simply piece of Debri blocking a control Door Inside the ducting from moving.
