VEHICLE WILL NOT GO IN GEAR WHEN HEATER IS ON
2004 Ford Explorer • 103,000 miles
If heater is off, car goes in gear fine. When heater is on, it won't come out of park? What on earth could cause this? I'm not sure if it is electrical related to the heater fan because it does the same thing when the A/C is turned on. If you turn on the A/C the vehicles transmission won't engage in any gear either. So A/C and Heater engagement causes the transmission to keep from shifting. The vehicle shifts fine while driving and you can use A/C or Heater. Put it in park and it won't re-engage until you turn off the A/C or Heater
June 5, 2013.
June 5, 2013.
I have to be honest. In 30 years of working on cars, this is the first time I heard this. Lol The two components are not tied together. The park lock solenoid is actuated by power through the brake light switch (not the HVAC system). When it happens, I need you to check to see if the brake lights are working. If they don't come on, then there is now power to the brake light switch or solenoid. Let me know what you find.
Thanks for the reply! Here's another curve ball for you. It acts like the issue is in the control switch, the switch that changes where the airflow is sent. When it is in the off position the Driving Lights Go Off and you can change gears, when you are in any other position the driving lights come on, but you can't shift from park. The break lights work fine. I've never seen anything like this either. Thanks for your help.
It sounds like the car is haunted. Maybe we need a priest. Lol WOW, you got me on this one because the vent door actuators are run by vacuum and not electric. Have you had a mechanic look at it yet?
Thanks for the reply. I was thinking the same thing. This thing is haunted. My technical knowledge is limited to AC systems and finding hidden electrical Issues. Which I believe this vehicle has. A ground issue in the wiring harness is my first guess, the PCM is my second. You have helped alot. I don't feel stupid anymore. So many times things like this are due to something simple. I will put two of my other mechanics to investigate the issue when they come by. Sometimes it takes two or three to figure out this kinda thing. I do want to tell you what we figure out, once we finish diagnostics. Thanks so much again for your help.
The second mechanic spent 15 minutes under the hood and found that the blower resister was bad causing the crazy transmission problem. Hope this helps someone : )
Jun 7, 2013.
Jun 7, 2013.
Well I,m freezing my butt off ! Anyway the heater motor works but it blows out cold air as well as luke warm but when I,m going down the road, there must be a hole somewhere under the ...
10 answers • 1991 Ford Tempo • 150,000 miles
My car heater only just warms up a little when running round town and stays cold on long run .temp gauge says tempreture ok .fan cuts in approx after just half way .coolant in expansion...
1 answer • 1998 Vauxhall Astra • 91,000 miles
I replaced my radiator and thermostat after the old radiator cracked, but I used a Gates 180° thermostat instead of the OE 170° thermostat. Since installing it 3 days ago, I've only ...
10 answers • 1995 Nissan Altima • 130,000 miles
In my 2007 saturn relay my rear heater works great, but the front heater only blows cold air..... there is plenty of coolant, the heater and a/c works in the back of the vehicle, and ...
5 answers • 2007 Saturn Relay • 68,000 miles