2.4T Engine is running hot, any suggestions?

[IAN]

When it is 70degrees or cooler I have no problems the temp guage is at 180.

When it is above 75, or 80 and I start driving more agressively the car heats up to 220, or 230. A few weekends ago I was driving over a mountain pass pretty hard and the temp gauge touched 250 for a minute. I slowed way down, but it left me a little concerned.

Thoughts?
Bad thermostat?
Junk on top of oil cooler?

Help.

thanks,
Ian

[not_sure]

I am having this same problem on my 2.4. I noticed it ran slightly cooler when I had the ducktail on it but it was still a little to hot. Would removing the engine tin make any differance? I plan to add a cooler as soon as my house is done and I have some downtime, but that wont be until winter and I cannot see not driving the car.

Tom
71T 2.4

[campbellcj]

You could try cleaning out your oil cooler. Carb cleaner or brake cleaner works pretty well.

Also if you haven't done so already, make sure your timing and other tune-up settings are normal.

[john walker's workshop]

use a fan from a 77, along with it's pulley. use an SC crank pulley. it's 93mm if i remember right. the smaller upper and larger lower pulleys spin the fan faster. good for 20° sometimes.

[Early_S_Man]

First thing is to block off your cooling air outlets (for heater) to the heat exchangers!

Rather doubtful that it is the thermostat stuck, that would cause big-time overheating, not marginal, but I suppose a partly stuck one could be possible! Debris on top of cylinders/heads seems a logical possibility. You can get at the tops of the cylinders and 'sort of' at the heads (#1 and #4, anyway) by removing the fan/alternator/housing assembly and rear vertical sheetmetal/tin pieces. Use a ShopVac, rather than trying to blow out with compressed air.

Weak springs for the oil system relief/bypass pistons are an easy thing to check, after you find the correct bit to remove the plugs ... approx. 1/8" x 1" slotted screwdriver (sometimes called Drag-Link bit) 1/2" drive bit. Be SURE THAT THE BIT IS A TIGHT FIT IN THE PLUG! File/grind to fit plug ... much better to buy oversize and file, than try a bit that is too small! The springs are supposed to be 70 mm long. The spring part number is 901.107.531.00.

One final thing to check is for a damaged/crushed or restricted hard scavenge line that runs under the transaxle.
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Warren Hall
1973 911S Targa

[This message has been edited by Early_S_Man (edited 05-30-2001).]

[Zendalar]

My 2.4T is running at 80-85 celsius, don't know what that is in F. Sounds normal?

[MMBRAZIL]

I think 85 celsius ( 185 F ), is good.
I had an over heating problem in my car a year ago. At any traffic it would go up to 110-120 celsius ( 230-250 F ). So I sent the car car to have a complete paint job, and when the car was apart I noticed that my oil tank was completely covered with oil and dust ( 5mm thick ). Cleaned it up and since then it hardly reaches 100 C ( 212F ).
So I deducted that the oil tank has an important job in cooling the oil too.

[MMBRAZIL]

I think 85 celsius ( 185 F ), is good.
I had an over heating problem in my car a year ago. At any traffic it would go up to 110-120 celsius ( 230-250 F ). So I sent the car car to have a complete paint job, and when the car was apart I noticed that my oil tank was completely covered with oil and dust ( 5mm thick ). Cleaned it up and since then it hardly reaches 100 C ( 212F ).
So I deducted that the oil tank has an important job in cooling the oil too.

[IAN]

I have a 72 with the oil tank in front of the rear right wheel.

My tank is also covered with oil, dirt and debris could this really be part of my heat problem?

[Early_S_Man]

Ian,

When dealing with a 29.5+ year old car and marginal oil temps on an engine that shouldn't be overheating, I have the feeling that it is a case of multiple problems, all contributing to some degree. So, if it is feasible to pull the tank, and get it cleaned ... inside and out, do so!

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Warren Hall
1973 911S Targa