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![djharris54](themes/aaAle/images/interface/profile-pic-placeholder.47cf740a.png)
HI there,
I am wondering whether I need to get my thermostat looked at in my 2006 Mazda3 manual hatch. The behaviour is unusual, and when the car is at higher revs the engine cools down. a typical morning commute from Newlands to WLG central will look like this on the gauge: First 4 kms, mostly sitting at 2,200-3,000 rpm, the gauge will stay below C, and when I reach the more congested traffic and rpms goes down to 1,500-2,000 the gauge will quickly move up to 1/4 of the way up, and will stay there until I come to a stop at lights, where it quickly shoots up to halfway. If I get my revs up to 3,000 rpms again (i only have 5 gears) it will go back down to 1/3 or 1/4 of the way up the gauge. On my most recent open road trip it was at halfway when stuck behind a truck going up the Saddle road, and when I passed it and completed the Saddle road the gauge was sitting bang on C. To me it seems like the car gives the car too much fan/coolant when the revs go up (which I can't help), and I am wondering whether I need to get this replaced. My handbrake cable needs tightening so I could kill two birds with one stone.
Many thanks,
Dave
![Anon](/assets/aa/aa-avatar.png?m=1466990309)
Hi Dave,
Yes this sounds very much like the thermostat is jammed open, it is definitely best to get It checked as the car will be running too cold a lot of the time and could even be using more fuel. Yes get both items checked off at the same time.