Changed control arms, now the dash coolant light is on?

Rocambolesque · Post by **Rocambolesque** » 28 Jul 2018, 16:38

The car is a '00 S70 2.4 N/A. Today I changed the control arms. All went well until the end of the job where I decided to investigate a whining noise from the engine. I decided to remove the serpentine belt and spin the accessories by hand. None made noise so i don't know what else it could be? Water pump or belt tensioner? Anyways, when I put everything back together I go for a test drive and now the dash coolant light is on, but the coolant tank is full. My question: can that light up for anything else than low coolant? I moved the tank in order to figure out how to relieve the tensioner, maybe I broke the sensor wires or something... If it's just that it's not a big deal.

Post by **Ozark Lee** » 28 Jul 2018, 16:58

The sensor snaps into the bottom of the tank and typically you can't really move the tank out of the way without unplugging it. Make sure it is still snapped back in and that the connector is hooked up.

...Lee

Post by **precopster** » 28 Jul 2018, 18:06

Now that you've eliminated the accessory area you'll need to investigate the timing components. The coolant sensor can fail and it is pretty easy to replace. When I had a leaking coolant reservoir it caused some corrosion in the coolant sensor connector. If you unplug and plug it back in 3 or 4 times it should wipe off any corrosion whether by coolant leakage or time.

Rocambolesque · Post by **Rocambolesque** » 28 Jul 2018, 19:09

If I believe the Contitech sticker on the timing cover, the last belt was 60 000 km ago. Most likely the PO had the tensioner and the idler changed as those 2 always come in the kits. Maybe the pump wasn't done then. But to verify I basically need to do the belt.

Post by **precopster** » 29 Jul 2018, 05:24

Even scarier is a non-Aisin brand pump was fitted and that can have pretty dire consequences if left unchecked.

Usually the Aisins will leak and not have bearing failure.

Post by **abscate** » 29 Jul 2018, 05:32

Ozark Lee wrote: ↑28 Jul 2018, 16:58 The sensor snaps into the bottom of the tank and typically you can't really move the tank out of the way without unplugging it. Make sure it is still snapped back in and that the connector is hooked up.

...Lee

Or snapping the wires into the sensor and requiring a new one....like this guy

viewtopic.php?f=1&t=57659&p=292541#p292541

Part number is probably good for your 2000 - confirm

Post by **oragex** » 29 Jul 2018, 07:21

Ozark Lee wrote: ↑28 Jul 2018, 16:58 The sensor snaps into the bottom of the tank and typically you can't really move the tank out of the way without unplugging it. Make sure it is still snapped back in and that the connector is hooked up.

...Lee

This. Always unplug the small electrical connector before lifting the coolant reservoir. A used sensor is easy to get from the junkyard/ebay, no need to drain the reservoir, the sensor just slides inside under the reservoir.