OBD1 S52 E30 Still OVERHEATING!

[TheRealE30kidd]

Ok so I have put about 6000 miles on the swap and im still having over heating problems and the warmer weather isnt helping.

Ive gone through 2 water pumps and 3 thermostat and 2 radiators.

The first water pump started screaming after 2k miles. first 80 deg thermostats was bad then I replaced it with another 80deg.

Then I made a bleeder screw in the Thermostats housing and adding a 75deg thermostats.

I have a Pusher fan in the front.


The First Radiator was a brand new M42 radiator and Ive heard they sometimes cant cool the bigger S52s so I snagged a used M20 radiator thats in ok condition but isnt clogged or leaking.


Just ran a compression test to check HG

190 195 190 190 200 185

All the number seem good.

So the car temp stays at 1/4 when on the freeway and as soon as I slow down it jumps to 1/2 then if stopped or slowly moving in high rpms it starts creeping up but if i start moving again it drops back down. Also if I turn the heater on I can manage it a bit. Im 95% sure the air is bleed b/c of the bleeder valve.

But all being said everything is new except radiator but seem to be fine SO I really dont know what to do now. Car should running around 1/4 with the 75deg tstat.

[havand]

Are you running AC?
Do you have underdrive pullies?

[MT325is]

i have heard people having overheating issues that are not running OEM BMW coolant in them?.
I dont know how true this is, but spmething i have heard.

[TheRealE30kidd]

Are you running AC?
Do you have underdrive pullies?

No AC in the car.

[jink0619]

i have heard people having overheating issues that are not running OEM BMW coolant in them?.
I dont know how true this is, but spmething i have heard.

This is so true! USE BMW COOLANT!!!

[berlow94]

Use bmw coolant. an aluminum e36 radiator, ginormous pusher fan, z3 electric fan switch, and an oil cooler makes a huge difference too. Make sure you have a water pump with a metal impeller too!

[MrSlacker]

Mishimoto radiator with a clutch fan does wonders.

[Wanganstyle]

Have you leaked down the cylinders or had the cooling system pressurized to check for leaks?

[AndrewBird]

1/2 on the temp gauge is not overheating. Unless the needle is in the red, it isn't overheating.

[TheRealE30kidd]

1/2 on the temp gauge is not overheating. Unless the needle is in the red, it isn't overheating.

It slowly creeps up to 3/4 if I dont turn the heater on. If it starts to get to 3/4 I shut the motor off. That kind of temp scares me!

Im thinking of getting a 2002 M coupe radiator but I think Ill go buy 2 gallons of BMW coolant tomorrow.

[328ijunkie]

Stock late model M20 rad/overflow setup, good non plastic, non stamped impeller wp, 80C thermo, non leaking cooling system (IE, able to pressurize itself to ~.5-1bar) blue or green coolant (yes blue is better but green will NOT cause overheating)

youve got something routed wrong or your HG is blown or your used radiator is shit.

[TheRealE30kidd]

Stock late model M20 rad/overflow setup, good non plastic, non stamped impeller wp, 80C thermo, non leaking cooling system (IE, able to pressurize itself to ~.5-1bar) blue or green coolant (yes blue is better but green will NOT cause overheating)

youve got something routed wrong or your HG is blown or your used radiator is shit.

Only thing with the routing issue I could see is the hose for the over flow tank to head is kinda of long.

[NickL]

Are you eating coolant at all? Smoking? Sounds like head gasket to me or you haven't evacuated all the air from the system.

[36brua]

...I have a Pusher fan in the front...

got to ask...you mentioned fan in first post but nothing else. Is your elec fan still working ? themo switch good ? manual switch.

[mr.vang]

sound like your pusher fan isn't cooling it enough or you had the two coolant sensors switched. was it overheating from the beginning of the swap or did it happen after couple thousand mile?