tfitzs01 wrote:The capacity of the coolant would have little to do with efficiency of the vehicle.
Example: Two containers of water, one is 10 gallons, the other is twenty gallons, are brought to a boil and allowed to cool on their own. Which cools faster... the 10 gallon or the twenty? Thermodynamics 101 tells us that the 10 gallon container will cool faster.
Now let's take your concern with cooling capacity. In the 1990 Q45, the coolant capacity is 10 7/8 qts. For the 1990 Benz SL300 the capacity is 12.2 qts. It does take longer to heat up more fluid as in the Benz, but the Q45 would have an easier time in removing excess heat if both radiators were the same (LARGE GENERALIZATION due to other environmental factors).
So if you are having an issue with staying cool:
1) Check fluid levels and examine any hoses and the radiator for leaks
2) Change Radiator cap (and make sure that radiator top is free from debris)
3) Change thermostat and coolant with a backflush to remove any debris from clogged coolant ports in engine block.
4) examine fan clutch and water pump (replace both at the same time). After reaching normal operating temperature, shut the engine off and try to spin the fan with your hand. If it revolves freely more than 3/4 a turn then it is time to replace.
5) Remove Radiator and get it cleaned or replaced.
5) Check EGR Valve for any deposit debris from the plenum. This valve cools the engine by recirculating exhaust gases into the combustion chamber.
6) Temperature sensor faulty (rarely)
Yes, I do use the temp gauge on the dash, always have. It is a reliable piece of equipment that tells you three things. Too cold...too hot...just right. Act accordingly.
I am not really concerned with the amount to time the vehicle requires to warm up to operating temperature in this case 176*F. And anyways the Thermostat, Auxiliary Air Control valve (AAC) and Fast Idle Cam (FIC) are in charge of that.
But what has me confused is why the FGY33 (1997-2001) Infiniti Q45 got more cooling capacity and duel electric condenser fans. I mean cost cutting is everywhere but even the condenser was made bigger by about a inch to hold the fans. Jeez I think those engineers need to go back to school don't you?
http://cgi.ebay.com/ebaymotors/1999-INF ... 058wt_1166
The FGY33 has a engine coolant capacity of 12-3/8 quarts VS the G50 of 10-7/8 quarts
The FGY33 had duel electronic condenser fans VS the G50's single condenser fan. Sadly the resonator pipe part of the air intake is partially in the way and removing it would change the entire intake system.
The FGY33 condenser size is: 30.90 X 19.50 X 3.90 VS the G50: 30.90 X 18.30 X 3.90. I assume to make sure the fans fit better.
http://cgi.ebay.com/ebaymotors/Infiniti ... 840wt_1166
It looks like there maybe some room according to the marks left by the OEM fan, for another electric fan.
qship96 wrote:Nothing to be sorry about,and your idea certainly would do no harm, maybe even be slightly beneficial under extreme operating conditions but why create things to spend time/money on when these old Q require soo much already just to maintain them as designed?
If proper upkeep and parts replacement works out to be $250-300 per month pro-rated {some months/years you spend more, some less} how much on top of that do you really want to spend on a depreciated old asset that may be totaled{written off by insurance company} by a simple fender bender......at some point of monthly outlay, the logic becomes questionable to put it into a 14-21 year old Q- as much as i still enjoy driving mine....
Thinking of ways to better the Q is what keeps me going. I know what it costs to own the Q but spacing out and looking at what could be helps me cope with owning a Q and wanting to restore it.
