2003 PT Cruiser GT Rad fan update....

[ChazBOT]

Is there a way to test the sensor with a volt meter?

[ChazBOT]

Originally Posted by ptcruisersteve

This link explains the PWM modulation in more simple terms.

PWM Modulation

Looks Chinese to me.... My question is if the coolant temperature sensor was bad, would that cause the fan NOT to come on even if the AC was on? Wouldn't that also cause a check engine light to come on for that sensor?

[ptcruisersteve]

Can you post the part number and brand name for the radiator fan you purchased. I would like to see if we can get the specifications for that radiator fan.

[ptcruisersteve]

Originally Posted by Busted_PT

I think Steve mid read. As long as you have the fan pluged in. It souls not matter. Car don't know what the orientation of the part. I can't say about wether or not if one of those componets mentioned is bad wether it will or won't run. Or if it will partially run.

Busted_PT you are right. I didn't read the post correctly.

[Busted_PT]

Originally Posted by ptcruisersteve

Busted_PT you are right. I didn't read the post correctly.

Yes, i knew you had. I do it all the time. But I type so slow I often catch my mistake before I post lol.

[ptcruisersteve]

The link below mentions checking the sensor resistance with a digital ohmmeter. In order to check your coolant temperature sensor we would need the table of ECT resistance for a certain temperature for that sensor.

Coolant Temperature Sensor – Auto Repair Help

[ChazBOT]

Originally Posted by ptcruisersteve

The link below mentions checking the sensor resistance with a digital ohmmeter. In order to check your coolant temperature sensor we would need the table of ECT resistance for a certain temperature for that sensor.

Coolant Temperature Sensor – Auto Repair Help

FIXED! It was exactly this. $16 god damn sensor. Like you or some one else said, my original fan probably worked. One messed up thing is that I bought an after market OEM replacement from AM--Autoparts for $380. When I hooked it up with the new sensor it started making a buzzing sound on my throttle body. Sending that thing back. The used Mercedes motor works so far. Going to drive it around for a bit.

Thanks you to everyone who put up with my ramblings!

[ptcruisersteve]

Originally Posted by ptcruisersteve

Did you check the coolant temperature sensor and the wiring going to it?

Did you ever measure pin #2?

Originally Posted by ptcruisersteve

Before we start looking at the PCM we need to look at the inputs that it receives to control the radiator fan operation.

To control radiator fan operation, the PCM looks at inputs from:

Engine coolant temperature
A/C pressure transducer
Ambient temperature
Vehicle speed
Transmission oil temperature (automatic transmission only)

We need to verify that all these components are operating properly.

First thing I would check is the ECT and the wiring going to it.

Originally Posted by ChazBOT

FIXED! It was exactly this. $16 god damn sensor. Like you or some one else said, my original fan probably worked. One messed up thing is that I bought an after market OEM replacement from AM--Autoparts for $380. When I hooked it up with the new sensor it started making a buzzing sound on my throttle body. Sending that thing back. The used Mercedes motor works so far. Going to drive it around for a bit.

Thanks you to everyone who put up with my ramblings!

I am happy you found the problem. Happy Cruising