2013 Lexus IS Diesel Overheating Issues and Low Coolant Warning

Hey there, sounds like a similar issue I had with my 2015 Lexus IS a while back. I noticed my car running hot and the coolant level dipping. Turned out it was an issue with the auxiliary heater. I was having this persistent warning light on my dash relating to the PTC heater as well. I didn't want to take any chances and took it to the garage right away. They did an inspection and let me know that the auxiliary heater was to blame. The mechanic then explained that there was a fault in the PTC and this was causing the car to overheat. Without the heater functioning correctly, the coolant couldn't do its job, hence the low levels. They had to replace the electric auxiliary heater to sort it out. No major component damage, luckily, but it's a serious issue you don't want to ignore. Get that looked at quick overheating can lead to bigger, costlier issues down the line. So it's better to nip it in the. Drive safe!

Hey, thanks for sharing your experience. Interesting that it sounds eerily similar to what I’m going through with my Lexus IS. I'll be sure to get this checked out ASAP just like you advised. Now about getting that electric auxiliary heater replaced, do you recall how much that set you back? Also, since having that sorted, has any other issue related to this popped up, or was that the end of it? Would really appreciate your insight. Cheers!

Hey! I totally get your apprehension, car troubles can be such a hassle! About the expenses, it did cost me a fair bit. Getting the Electric auxiliary heater serviced set me back around 350€. Not exactly pocket change, but definitely worth it considering the peace of mind it's given me since. And to answer your question, after getting that pesky PTC heater issue fixed, I haven't had any other related problems crop up. Honestly, it's been smooth cruising since then! Best of luck with your car, hope it gets sorted out soon without any problems! Stay safe on the roads.

Hey! I appreciate the fast response and the breakdown of costs. It's not exactly a small sum, but I guess it's better than risking further damage, isn't it? It's fantastic to know that you haven't had any further issues since then. Gives me hope that my baby will be back out on the streets, as good as new soon! Thanks again for the valuable advice and well wishes. I'll take the ol' girl to the garage tomorrow to get that heater fixed up. Fingers crossed that all we need to deal with is a faulty PTC heater, just like your situation! Well, cheers again, and stay safe out there too. Bye!