Quote:
Originally Posted by Krem
I have a hard time swallowing that is my only issue.
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Get a glass of water then... because it very well could be the only problem.
Mirage is correct in just about everything he's posted.
The fan cowl actually has the biggest effect on the cooling system at slow speeds or while the car is stopped (see: city driving). He's also correct in that a missing undercover can increase temps although this is only at driving speeds where more air can be forced through the rad than allowing it to blow out under it before it goes through; At a stop the undercover provides no benefit.
The lack of heat through the heater is most likely due to a bad VSV on the heater control switch. To test this bypass the VSV of the heater control valve which is on the firewall, on the passenger side and right below the engine harness... it's the valve with two heater hoses running to it.
http://www.cygnusx1.net/Supra/Librar...spx?F=8716&P=1 Just run the vacuum line which goes along the firewall to the VSV directly to the vacuum port on top of the bell shaped diaphragm. This is VERY common and has nothing to do with engine temps. Once you get this done turn on the heat while the engine is warm... if the windows steam up, you smell a lot more coolant or you see "smoke" come out of the vents you've got a leak in the heater core... even if there is a leak, unless it was pouring and you were always out of coolant it's not the problem.
What is your spark advance (timing) set to? The greater the advance the more heat there is for the cooling system to clean up.
Get the radiator flushed to ensure it's flowing sufficiently.
Take a medium sized towel and tie it below the pugre for the coolant reservoir. Make sure the coolant system is all full at the PROPER level (radiator full and reservoir full to the Max. level while the engine is "warm") and go for a drive. Check the towel after... if it's soaked you're purging and may have a bad radiator cap or you may have combution gasses venting into the coolant system (this would be the beginning of a BHG).
If you keep letting the car overheat you're gambling in a MAJOR way. The temp gauge reports on a bell curve. The lower section is very steep and reflects small changes with a lot of movement. The center section is fairly broad and remains there for a pretty large range... past the middle mark the gauge shows very little movement for big increases... What this means is that when you see it approach the top of the gauge your temps may be high enough to not only blow the HG but even warp the head.
As for how long it takes to warm up... takes my car about 2 or 2.5 miles. Without the shroud you could probably cut that in half.