When I change the temperature in my is300 2001 it

Depending if it's manual temp control or auto.............

Here's manual

1 - Air Temperature Sensor - Upper Left
2 - Air Temperature Actuator - Left
3 - Air Temperature Sensor - Lower Right
4 - Air Temperature Actuator - Right
5 - Mode Actuator
6 - Air Temperature Sensor - Upper Right
7 - Blower Motor
8 - Blower Motor Control Module
9 - Evaporator Temperature Sensor
10 - Air Temperature Sensor - Lower Left






Here's auto

1 - Mode Actuator
2 - Recirculation Actuator
3 - Blower Motor
4 - Blower Motor Control Module
5 - Air Temperature Actuator
6 - Evaporator Temperature Sensor

-There are couple thing that cause not to start:
*Before check the following, make sure battery is full of charge.
1. No thing at all. Possible Corrosion battery cable or bad connector or starter relay. (Visual Inspect it) Clean it or tight it
2.Click but never turn or start. Starter has dirty contact or worn out. (Replace W/new one)

Good luck

Mai Lor

There is a blower control resistor (manual system) or a blower transistor (automatic temp system) located behind the glove compartment in the HVAC box and this is a high failure item.

You need to look at the temp sending unit it's probably faulty anthor issue with volvo is dirty throttle body's this raises havoc on the car they idle up down all over the map also you should change the thermostat too as a precautionary measure make sure it's the right temp for your year of your car thanx Chris

temp sensor failed. could be the air intake sensor... or the ecu temp sensor falling... easy to find out if intake sensor failing. before starting on a cold morning. or under 10 degrees.. unhook the air pipe and blow with your breath over the sensor put back and start engine. if engine starts fine then that's your problem.

BEHIND GLOVE BOX ON THE HEATER IS AIR TEMP
ACTUATOR- 2 SCREWS AND 2 WIRE PLUG IN NEEDS TO BE REPLACED

it's the computer brain behind ur glove box open uf glove box and there are four screws you have to remove and it right behind there . It's easy to change just un plug it plug new one in make sure ur batt is disconected befour doing this though..and check ur module under ur distriboutor cap they go bad too both of these things should be able to be tested at an autozone or orielly

Sounds like its the mixing door actuator motor. I believe its located behind your glove box, so if you remove your glove box you should be able to see it. Its a motor that actuates the mixing door to allow only hot, only cool, or a combination of the two into the vehicle. If you can get at it and the door seems to be able to move freely, you may want to check the heater control switch for voltage change using a multimeter. Im 99% sure it is one of these two culprits. Either the actuator motor or the switch. Good luck!

sounds like your main computer has gone bad,the error code means it cant read the CPU, buy a used one from the junk yard with a return policy, If that does not get the car running you can return it..It should be located in the lower right side of the dash, behind the glove box

First, try checking the connections behind the dash that link together at the temperature gauge and make sure they haven't torn or ripped. If that doesn't help, then check/replace all the sensors which relate temperature to the gauge, ie: air temperature sensor, coolant temperature sensor, etc...Hope this helps, good luck.