Overcooling?

Post by **willmoodom** » Thu Jan 19, 2012 3:17 am

i have a 92 q45 base. good clutch and replaced thermostat. maybe a total of 25 hours driving time since the replacement. this is the first winter of having and driving the car. right now swapping interior, fixing wires, sunroof, and overall cleaning due to a couple water leaks. anyway, the few times Ive driven the car these cold days, it seems to take the car forever to reach operating temp. i mean upwards of a half hour of drive time and that's after idling for 10-15 minutes. now im still learning about the car, but does anyone elses car take that long to warm up? i don't think i put the tstat in backwards. is that possible? clutch isn't seized. i no that for a fact, but even so, it should still warm up in a reasonable amount of time. during the summer the temp would creep pass 200, now it takes forever to warm up. defective tstat?
on a different note, finally got the rack installed and steering is nice and tight, though i think i will need a new sensor due to some times hard steering until moving, like backing out my driveway. but man it felt good hittin them corners. Car feels much lighter then it is.

Post by **Rex** » Thu Jan 19, 2012 10:53 am

Sounds like a T-Stat that's failed in the open position ... of course, it could also be a bad temp gauge/sending unit.

If you let it idle until "warm" and turn on the heat full blast does any heat come out? does the temp gauge start going back towards cool?

Post by **willmoodom** » Thu Jan 19, 2012 1:13 pm

iv done that and never paid attention. so if it is blowing out warm-hot air the problem is temp gauge. and if its cold air then its tstat?

Post by **Rex** » Thu Jan 19, 2012 8:23 pm

If the temp gauge shows normal and the air starts out warm, but then cools as the temp drops it would seem to indicate the T-stat is staying open.

If the air stays warm even as the gauge moves to "cool" it might be the gauge or temp sending unit.

Post by **Q451990** » Fri Jan 20, 2012 11:12 am

Where are you located? What kind of ambient temperatures are we talking about?

Even in very cold temperatures, mine will warm up in about 5 minutes of idling. When mine failed, I would notice that the car wouldn't stay warmed up at speed on the interstate when it was really cold (which for here is in the 20's). If you notice that your temperature gauge won't stay at 9 o'clock at cruise, it's time to pull the t-stat and try again for sure. I've never heard of a failed temperature sending unit - but I guess it's possible. Everything is fair game at this point.

Heath

Post by **willmoodom** » Fri Jan 20, 2012 11:55 am

Im in Maryland and the temps haven't been that low. When driving it appears to stay at operating temp. No problem with the heat. It just takes forever to warm up, according to the gauge. Maybe I need to plug up the datascan to see what's going on. Our cars have a separate sensor for the gauge and the temp to computer right?

Post by **qship96** » Fri Jan 20, 2012 12:36 pm

What part of Maryland are you in? I am also from Maryland, in the Towson/Timonium area of northern Baltimore county. It generally takes about 5 minutes for my q to reach operating temp, unless it is super cold-then it could take 8-9 minutes of idle or so. Generally if temps are above freezing,I just start it and drive off after 30 seconds or so at light throttle keeping RPMs below 2000 until fully warmed up, which is about 1-2 miles.

Post by **willmoodom** » Fri Jan 20, 2012 1:47 pm

Im in rockville,md of Montgomery county. We are exeriancing pretty much the same temps. Once I put the dash back in I will hook up the data and see what shows. Im thinking a sticking stat. But damn, its still practically brand new less than a month of driving.

Post by **Lokim** » Fri Jan 20, 2012 2:17 pm

Is it an OEM t-stat or an aftermarket? Prev. owner put a cheapo aftermarket in mine and it failed open. Popped a Gates OEM in and it was twice as heavy as the Moto-Rad I removed. It's been working fine since.

Post by **qship96** » Fri Jan 20, 2012 2:45 pm

My original thermostat and waterpump that was installed at the factory was replaced at 201,000 miles as preventative maintenance.....both were still operating fine. something to be said about choosing genuine Infiniti parts,even if they cost a few dollars more,they seem to last.

Post by **willmoodom** » Fri Jan 20, 2012 4:48 pm

i have to admit i didnt use oem. i got the tstat from advance auto. didnt predict that would give me a problem.

Post by **Lokim** » Fri Jan 20, 2012 8:16 pm

Don't buy cheap t-stats. The most expensive ones are still less than 90% of the water pumps out there and re just as important as your oil filter. You don't buy cheap oil filters do you???

Post by **Q451990** » Fri Jan 20, 2012 9:51 pm

willmoodom wrote:i have to admit i didnt use oem. i got the tstat from advance auto. didnt predict that would give me a problem.

I'd go ahead and toss in an OEM one and see if that helps...

Heath

Post by **Skibane** » Sat Jan 21, 2012 1:30 am

willmoodom wrote:it seems to take the car forever to reach operating temp. i mean upwards of a half hour of drive time and that's after idling for 10-15 minutes. now im still learning about the car, but does anyone elses car take that long to warm up?

No.

The Q has a VERY short warm-up time - The temp gauge typically takes just a few minutes to move up to normal operating temperature.

Are you sure you didn't put the thermostat in backwards?

Also, it needs to be rotated so that the "jiggle valve" is at the top of the thermostat housing.

Overcooling?

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