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Temp just seems to be going higher but not quite overheating but close (solved "for now")

cooling radiator fans temp

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#1 madmanperez

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Posted 05 August 2018 - 06:52 PM

When I got my '87 Starion (about 2 1/2 years ago) it had a aftermarket aluminum radiator (at least I'm pretty sure its aluminum). Anyway, the care always ran a little hot, especially when the A/C was running. It had these 2 wimpy 6" approx. fans that just weren't pulling enough, or bare enough, of air through the radiator.

Ok, that's the history.

Now, 2 1/2 years down the road, 1 of the wimpy fans went bad. Then noticed neither one was working. One was definitely bad. I decided that may 1 big (10", maybe 12") fan would be better than 2 wimpy 6" fans. Also put in a 180 degree thermostat.

Now for the problem.

Found out the big fan wasn't coming on either, so I put in a relay so the fan comes on with the engine. During the winter (here in Florida 80 degrees or less is what they call winter) Temps looked good, even with the A/C running.
Now the the summer is here temps run high (over half on the gauge) now turn on the A/C and what I have is a car that's begging to overheat but not quite.

So, obviously the temp sensor in the thermostat housing is most likely bad since it doesn't trigger the fan. Coolant flow seems to be good. The overflow tank fills to about the full marker when the engine is hot, nearly empty when cold.

I want to thank all of you guys in advance for your thoughts/ideas to address what I've got going on. The members here have always come through for me.

Edited by madmanperez, 29 September 2018 - 06:27 PM.






#2 rcm

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Posted 05 August 2018 - 08:20 PM

Well a stock car has the thermo sensors for the fan in bottom of radiator.The system runs three fans.So you are way under cfm to keep cool.

Edited by rcm, 05 August 2018 - 08:20 PM.


#3 techboy

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Posted 05 August 2018 - 10:10 PM

Yep, try replacing the termosensors at the bottom of rad along with the CTS.  They're cheap enough, I'd start there.
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#4 TexasQuest

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Posted 05 August 2018 - 11:32 PM

The front fan only comes on when the air conditioning is activated. Most people run 2 low temp thermosensors along with a jumper wire connecting the two together so they come on at the same time.
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View PostJohnnyWadd, on 04 March 2010 - 10:01 PM, said:

my shaft was big i dont know what your talking about.

#5 croquest87

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Posted 06 August 2018 - 10:46 AM

You can ground the two wires that go to the sensors on the radiator all 3 fans should turn on w the key on  cold or hot it doesn't matter. Just to test the fans they will run full time that way  but not recommend  leaving it that way. Or you can eliminate all the mambo jambo and get yourself mechanical fan and shroud   no more power draw sensors relays non of it. Now some say mechanical fans are less effective. Well l use one w cx racing alum radiator and never had temp climb over 180 deg even on 90 deg day. It's simple and effective.

Edited by croquest87, 06 August 2018 - 10:53 AM.


#6 madmanperez

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Posted 08 August 2018 - 01:25 PM

OK, maybe to much info in my first msg.

Thanks for all the replies.

RCM - The car is stock but not the radiator. The thermostat housing has three sensors (of some sort). One is a feed to the temp gauge, the second was hooked to the fans, not sure what the third is for.

The one fan I have in there is pulling a lot of air (Don't remember exactly the CFM lvl but I want to same something close to 800 i think some how 1200 comes to mind but not sure)
What I do know is the one fan pulls enough air to actually spin the front fan when its not running.

I'll have to check to make sure the front fan is coming on with the A/C. What I have noticed is that the A/c seems to blow cooler when I'm standing still and not as cold when I'm moving (related problem?)

Croquest87 - you mentioned a mechanical fan. Do you mean connected to the crank (main pulley)?

#7 croquest87

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Posted 08 August 2018 - 07:59 PM

It bolts up to the water pump!   I listed part numbers also for mechanical conversion w pics and all.  It's simple and effective. Here it is that post that was started by Randy
http://www.starquest...88#entry1562209

Edited by croquest87, 08 August 2018 - 08:08 PM.


#8 importwarrior

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Posted 09 August 2018 - 05:51 AM

does your radiator have a shroud?
if so I have one and noticed that
my car runs hotter than it used to.

when on the expressway it is normal
but city stop n go it runs hot. fans
are on and off a lot more.

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#9 madmanperez

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Posted 09 August 2018 - 10:11 PM

croquest - I looked at the pictures.. I wish my engine bay looked that nice. My engine has an idler pulley near the top left (when you'r looking at it. I'll have to take a look as to where my water pump is 'cause I don't think it's in the same place as yours, as best as I can tell anyway.

importwarrior - no shroud. just like you said, stop and go gets the temp right up there and faster is the A/c is running.

I'll try to take some pics tomorrow (to late now) and post them them here.

I really appreciate the time you guys are putting in to help me with this.

#10 importwarrior

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Posted 10 August 2018 - 10:38 AM

This fan looks like what I want to try next.

Spal fan 12" AP90 vs Cheap Ebay fan 12"



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#11 madmanperez

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Posted 10 August 2018 - 07:16 PM

Here are the pictures I promised. You can see that I don't have a lot of space and that the engine bay is a complete mess. (she runs good though)
I'm hoping that at least one of these gives a good perspective of the size of the radiator

FormatFactoryIMG 20180810 164148

FormatFactoryIMG 20180810 164126


FormatFactoryIMG 20180810 164101
never realized that the thing the current fan just clears is the front of the water pump (duh)

FormatFactoryIMG 20180810 164111

importwarrior - I know those fans (nice) won't fit in my car you can see the lack of clearance in one of my pictures

Edited by madmanperez, 10 August 2018 - 07:18 PM.


#12 croquest87

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Posted 10 August 2018 - 08:01 PM

There is more than enough room for 2 electrical fans or single mechanical everything is same as on our cars  my radiator is even thicker and wider than yours just need few things re routed that's all

#13 madmanperez

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Posted 11 August 2018 - 03:21 PM

I thought that 2 would fit, the one in the picture is the 12" I thought i could put the functional wimpy 10" in there also but I couldn't get both to fit.

So,  I guess the a clutch fan and shroud is my best solution?

I saw the part # for the clutch fan in the other post. I noticed it did not come with the blades, where did you get those?
Where would i begin to look for a shroud? For what I would now refer to a my small radiator, since based on your comments its not as big as I thought.

Is it a standard piece or is it custom based on radiator size (width)?

Finally, what do you mean a few things re-routed? :(

I know, its a lot of questions

Edited by madmanperez, 11 August 2018 - 08:23 PM.


#14 croquest87

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Posted 11 August 2018 - 11:55 PM

I bought mechanical fan from d50 on eBay also shroud for conquest on eBay  you can post on here that you are looking for one.

As far as re routing things l mean that some of your vacum lines and plug wires just need tucked in nicely away from mechanical fan simple stuff! You may have to fab something to mount your shroud nicely since you don't have mounting holes on your radiator for stock shroud but should be easy to make that happen.
Here is the fan for sale right now if you are going that route!
https://rover.ebay.c...tm/382497763784

Also l would clean that radiator real good and back flush it and new thermostat and radiator cap.
Good luck

Edited by croquest87, 12 August 2018 - 12:04 AM.


#15 Tim_C.

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Posted 20 August 2018 - 12:30 PM

It seems to me that there could be an air pocket in the cooling system. I like to park the car on a small hill so the radiator cap is the highest point in the cooling system.
When cool, remove the radiator cap and start the engine. Let it run until coolant starts to overflow, then put the cap on. That will push out all of the air in the system and it should run cooler. My electric fans rarely come on with a stock radiator and temps stay around half on the gauge. Should be even better with that big aluminum radiator in there.
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#16 madmanperez

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Posted 02 September 2018 - 01:45 PM

Tim C.
I'll give it a try. I found that the A/C's temp/pressure switch was bad. A/S fan wouldn't come on unless the car was close to overheating. Switch was replaced now the fan runs with the A/C cycle. And as the "backup" if engine temp gets to high.

BTW no hills in FL, I like to say that the largest hill we have is a trash heap, LOL. I'll jack it up and put it on jack stand or ramps to get the desired effect.
Thanks





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