88 TII overheating on highway issue
#1
Senior Member
Thread Starter
88 TII overheating on highway issue
My TII overheats on the highway or 40-50mph local driving after 15-20 mins. Temps are great when sitting idle and even went through a 2 hour dyno session with no issues at all. Problems arise only with constant load. Could it be:
A. airflow issue - FMIC covers the whole grill area on my OEM s4 bumper
B. thermostat
C. no fan shroud on my electric fan
A. airflow issue - FMIC covers the whole grill area on my OEM s4 bumper
B. thermostat
C. no fan shroud on my electric fan
#3
Senior Member
Thread Starter
no under tray. i assumed that if it was not an airflow issue because it wouldn't have the issue when i'm driving on the highway, or is that where i've gone wrong?
#4
Instrument Of G0D.
iTrader: (1)
Airflow and possibly blocked/inefficient rad if its only at cruising speeds, when you have an endless supply of free air but constant partial engine load. Id check the ducting first. Make sure air coming through front of car has no where to go but through the rad. If that involves putting undertray on and sealing gaps around the edges with foam or whatever.
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#11
Senior Member
Thread Starter
on my s4 cluster, the water temp will sit about 1/8th way up from cold start to warm up (car not moving) however, with my current issue it'll go halfway or maybe even slightly over after 15 mins of driving.
Last edited by boostinfc3s; 04-07-17 at 04:15 AM.
#15
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How old is your radiator? OEM or aftermarket? I had the same problem. Turned out my radiator was partially clogged. Bought a new koyo, problem solved. Intercooler directly in front of radiator, no tray or ducting.
#16
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Only e-fan you should be running is a 2 speed Ford Taurus, Probe, or similar with a proper thermo switch in place. The undertray is an absolute must. Front Mount Intercooler should not be a problem if you duct everything properly. Without that tray, you will overheat on the highway.
#17
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Only e-fan you should be running is a 2 speed Ford Taurus, Probe, or similar with a proper thermo switch in place. The undertray is an absolute must. Front Mount Intercooler should not be a problem if you duct everything properly. Without that tray, you will overheat on the highway.
#18
Ban Peak
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OP, Do you still have A/C? The condenser coil can heat soak and block airflow to the rad even when it is not in use. Get an undertray, and check out your fan situation, some fans can inhibit air flow.
#20
Rotary Freak
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Originally Posted by bpdchief
Only e-fan you should be running is a 2 speed Ford Taurus, Probe, or similar with a proper thermo switch in place. The undertray is an absolute must. Front Mount Intercooler should not be a problem if you duct everything properly. Without that tray, you will overheat on the highway.
#21
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Now i sold it and its going to work great for somebody else.
#22
Rotary Freak
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Originally Posted by Fuhnortoner
My ebay fan worked great for the three years i owned my car. it would cool it from 205 to 195 in less than a minute.
Now i sold it and its going to work great for somebody else.
Now i sold it and its going to work great for somebody else.
#24
Senior Member
Thread Starter
i have a koyo. LBC is out for the next month and i haven't been able to find an under tray alternative yet. going to do a full coolant flush cause the car sat still for 4-5 years.
#25
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