Where can I find my 85' camaro's temperature coolant switch? Could someone please inform me about the location?

Thanks

 

Coolant switch? You mean the one for the electric fan? I didn't think 85's had electric fans, but then I've only had experience with one, and mine didn't. There are two coolant sensors if I remember.. One for the electric fan, the other for the temperature gauge in the dash. One is located in front of the intake manifold, and the other is located (I believe) on the passenger's side of the engine. Someone with pictures will chime in I'm sure.

 

actually, there are 3 temp sensors.

1: in passenger head between #6 and #8 spark plugs---controls the electric fan

2: in the drivers side head between #1 and #3 spark plugs---sends info to the temp gauge/light

3: in the water neck where thermostat is----sends info to ECM to make tuning adjustments

 

Maybe my '85 IROC is a freak.......but I don't have a fan switch on the passenger side head. My fan is cut off and on by the ECM. Another 85 IROC I looked at, which is TPI and single electric fan like mine, doesn't either. Helms manual doesn't mention one either.

There is the temp gauge sending unit, located in the driver's side cylinder head between #1 and #3 cylinders. This is what your temp gauge or idiot light gets it's info from.

There is also a coolant temp switch in the front of the intake manifold, right above the water pump on the front of the engine. This tells the ECM what temp the coolant is at.

Carbed cars had this sensor in the thermostat housing.


HTH

 

Fudi,

Welcome to ThirdGen.org!

You may or may not have some or all of those coolant temperature sensors, depending on which engine your car has. An '85 TPI engine will have two CTS and one Cold Start Injector control.

So, which engine do you have?

 

Thanks for comments,

I have TPI engine yes, with one electric fan and I don't have any sensor on passenger's side but there is a proper place for one there, just where 1986redbird told it could be. So, right now I'm using the fan manually and I think the problem is in ECM. Now i've had enough of the manual switching so I will install a sensor on passenger's side.

Greetings from Finland

Fudi

 

Fudi,

There should be no need for the second temperature sensor with a single cooling fan system. The ECM controls the cooling fan operation through the fan relay. Temperature information is from the CTS in the front of the intake base:



This is separate from the sensor that operates the temperature gauge on the instrument panel.

If your car has air conditioning, an easy method to check the fan/relay operation is to remove the AC pressure switch connector on the high pressure line along the right frame rail. The fan should start immediately with the connector removed and ignition on. If not, you need to check the fan relay. If the relay is operational, the ECM or its wiring may have a problem.