'99 S70 Engine Temperature Indicator

DePonce · Post by **DePonce** » 03 Nov 2014, 14:35

I’m noticing the engine temperature warning indicator on my ‘99S70, w/148K miles (I’m the original and proud owner) comes on when starting from a completely cold engine state (e.g. first start in the morning), remains on for a few seconds, turns off and remains off while in operation. Thisis now a daily routine. It seems notto do this when starting from a warm/hot engine state. I’m guessing a possible issue with thecontacts within the heat sensor wiring. Any suggestions on troubleshooting and solution?

Any pictures showing location of sensor andrelated wiring will be helpful!

Thanks!

alam

Post by **rspi** » 03 Nov 2014, 17:56

I do not know what you are referring to. You may want to post a picture of what you are seeing.

DePonce · Post by **DePonce** » 03 Nov 2014, 20:10

The only engine temperature (or coolant? indicator is on the dash, red with a radiator/fan icon.

Post by **j-dawg** » 03 Nov 2014, 20:50

That's the coolant level light.

Is your coolant low?

Post by **jblackburn** » 04 Nov 2014, 07:58

Coolant expands when it gets hot, so it may actually be low first thing in the morning.

If the level is OK, sometimes the float in the coolant level tank gets stuck. You can take the tank off the fender and smack the side of it with a wrench in an attempt to free up the float.

If the float is moving freely, there's a sensor that goes into it - check the connection at the plug for corrosion; if it appears to be good, replace the sensor itself.

krenekj · Post by **krenekj** » 04 Nov 2014, 09:47

It sounds like your coolant level is a bit low. Check the expansion tank when the engine is cold and has not been run for a while. You may see it near or below the bottom fill line. If so, add a 50/50 mix per the owner's manual.

About every 6 months, my coolant light would exhibit the same symptoms. I would add a bit of coolant mix, but finally discovered a leaky hose from the bottom of the tank to the rear of the engine block. It never dripped anything on the ground and it was tough to see. Replaced the hose and no problems since.

Post by **polskamafia mjl** » 04 Nov 2014, 17:52

The only temperature indicator is the coolant temperature gauge which is a dial gauge not a light. As everyone else said, that light indicates low coolant level.

That's not an S70 instrument cluster is it??

DePonce · Post by **DePonce** » 04 Nov 2014, 18:31

Thanks all! and yes, that is not the S70 instrument cluster, just a pic I found on the web for illustration purposes! I checked the coolant level in the morning and is just a hair below the min line - will this trigger the coolant light?

Post by **jblackburn** » 04 Nov 2014, 19:05

DePonce wrote:Thanks all! and yes, that is not the S70 instrument cluster, just a pic I found on the web for illustration purposes! I checked the coolant level in the morning and is just a hair below the min line - will this trigger the coolant light?

That's exactly what it's trying to tell you.

Add coolant, search for leaks. It's low for a reason.

DePonce · Post by **DePonce** » 04 Nov 2014, 19:17

Thanks! I'm the original owner and never seen any indications of leaks, but I will check it out. BTW, I have never flushed the system either. Thx!