Hi there, thanks for your reply as well. Ok here is what happened, to better clear things up, and this is why we think it is the radiator: 1.) there was a huge truck ahead of us, always hitting the shoulder of the road, and spitting rocks back.

2.) There was NO issues what so ever with the car and cooling until after this rock incident happened. (As you said we can't prove this is, but it's the most likely thing.

3.) We had the car inspected just last month, and it passed inspection. (I'm not sure what they check)

4.) Once the fins/slots were pinched closed, the car started to cool off immediately, and went from FULL heat to half, (Water was also added)

5.) We got another 100kms or so, with no issues, after the fins were pinched, and water was added.

6.) Today, the hubby went 2kms, and the car went to 3/4 on the temp gauge. (He didn't add more water), which leads us to think that the water was leaking out overnight, as it didn't overheat in 100kms yesterday, after the rock incident, but did overheat today.

I hope that makes more sense? If the temp gauge was stuck, wouldn't it show as overheating during the 100kms after the issue?
Wouldn't a rock stuck in the radiator (Fairly big I assume), require replacement anyway? Perhaps we will replace the temp gauge as well, as a precaution, what do you guys think? Thanks so much for the advice. We only have this car a couple of months, and we're really enjoying the feel and comfort of it, as well as gas mileage.