Looking for 308 help

Sorry, not sure exactly what your problem is. Coolant temp is reading too high? When? Traffic? What is the temp in traffic and at highway speed? AC on or off? AC on in traffic?

Basically, the first thing to do is to replace your radiator cap. Next burp all the air out of the system. I did this by parking facing on steep hill with the car running (watch that hand brake) then bleeding air out of the front bleed valve. Did this on a couple of drives until ALL THE AIR IS OUT. Can't just do one and done.

If that does not work, then pressure test system/take to a radiator shop and have them diagnose it. The car should run cool.

 

Hi Lamb’, I have mondi QV so same system. Can I confirm that: you had a shop fit a bunch of new Forza parts and service and it came back with a 12k total but runs hot?

Can I ask what temp does it run, is it at idle, in traffic, how long at speed to run at normal?

What is ‘your comfort’ vs your manual? What other symptoms - eg loosing coolant from expansion tank after a run.

Sorry to ask for what may seem repeat info, but trying to get a clearer diagnostic picture. I replaced / reconditioned all my pipes, pump, radiator, thermostats.... so have a little DIY experience. Thanks


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We need a lot more specific tech information than "it runs hotter than I like."

 

What is the ambient temp during all this? A QV will run perfectly with a good stock cooling system. You got a forza radiator. What else is not stock? What is the new waterpump? Is it rebuilt to new? Does it have the proper impeller or just one that appears to fit? There is a proper clearance spec for the gap of impeller to pump body too. Do you have a new stock Tstat or just one that fits? What process did you use to bleed the system of air? Are the fans working?

 

I am going with air flow over the radiator. Have the fans been changed? Has the wiring been updated with relays to provide a strong voltage?
Weak voltage through Ferrari wiring, relays, fuses and switches will cause fans to run slower than optimum. If the car cools with added air flow (no traffic and open road), work on the fans.
Had a couple Boxers and a 308 that were like this. Once we had the fans back up to speed, no more issues.

 

And it’s holding fluid, and not gaining air - remembering Kcaboilot’s car thread...


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- Make sure the system is properly bled of air
- Check the fans. Even if they are getting a good amount of power, it's possible that after 35 years those fans need to be replaced. They do go bad eventually.

 

Running lean maybe?

 

Look in the 308/328 section. Mike996 recently posted a similar cooling system thread(s) with lots of post mortem analysis.

 

What is the oil temp doing?

If it’s much cooler - bad water temp sender?


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OEM or something else with non-oem radiator? Also, you need to do as Wade said in POST 8. You need to check the wiring. Ferrari runs lots of power poorly through that system. You could have voltage drop so fans run but not at right RPM to drive the cooling air. A quick check is how fast the fans run at idle VS how fast fans run when hotwired directly to a good battery. A significant difference maybe the answer to your problem.

 

Get a laser thermometer and measure block temperature when guage reads hot. Verifu accuracy of guage. Some fail like that. You may not be overheating at all, just getting a bad reading from the guage.

 

Why were all the new cooling system components installed in the first place. Was it running hot before?

 

Ref an earlier post and another one above regarding 308/328 section - I would recommend kcabpilot’s thread. You are almost describing his situation to the letter.


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Air in cooling system
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Unless something is wrong with the plumbing (changed from OEM or broken) you don't need to worry about the "L pipe at the expansion tank", or start dipping the overflow tube in the coolant.

Quick idea: if your cap is original, replace it.

 

What is your oil temperature doing. If it is reading normal you might want to check your water temp sender. Just a thought.

 

Long shot, but not unheard of that the radiator fans are blowign the wrong way, either because the wiring has been reversed or the fan blades installed arounf the wrong way

 

Or they aren't coming on soon enough. Check the temp switch to make sure it's turning them on at the right temp. Some folks have swapped in a lower temperature switch so the fans come on earlier. I think it's a VW part. Should be in the cross-reference parts thread.