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Old 07-11-2015, 10:12 PM   #21
Bildo Baggins
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1997 SL2
Default Re: SC1 Overheating unless moving

Thanks

Plugs, thermostat, o-ring, in the basket

Maybe new ECTS just for good measure

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Old 07-11-2015, 10:19 PM   #22
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Default Re: SC1 Overheating unless moving

Will not hurt, check your connector and wiring while changing it of not done previously.

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Old 07-11-2015, 10:34 PM   #23
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Default Re: SC1 Overheating unless moving

$29 big ones they want for a new pigtail/connector! Gonna try the sensor and the rest first and check connector if temp still wonky.

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Old 07-11-2015, 10:41 PM   #24
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Default Re: SC1 Overheating unless moving

Go to JY and clip off an IAT connector out on the front of the filter box, same connector. Yes, they are right expensive.

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Old 07-11-2015, 10:50 PM   #25
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Default Re: SC1 Overheating unless moving

I'll be darned. I remember replacing that sensor. Good looking out.

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Old 07-11-2015, 11:40 PM   #26
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Default Re: SC1 Overheating unless moving

I also remember that this car will not run for beans if that IAT sensor is bogus. I was amazed at how shoddy it ran when it went bad.

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Old 07-12-2015, 01:03 AM   #27
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Default Re: SC1 Overheating unless moving

Quote:
Originally Posted by OldNuc View Post
Amazon will take almost as long so go with the best price.
Amazon will be here Wednesday, so for cost and shipping speed, that's the route I'll go.

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Old 07-12-2015, 05:01 PM   #28
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Default Re: SC1 Overheating unless moving

I'm going in
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Old 07-12-2015, 07:58 PM   #29
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Default Re: SC1 Overheating unless moving

Post thermostat and flush/fill thoughts. Old thermostat was the German probably OE. I could not tell whether it was open or close or normal. New one in and ran it up for a bit then drove around block and let idle for about 15 minutes or so. observations are that, for whatever reason, the car appears to idle smoother, the temperature made it up to just below half, and fan never kicked in. Typical behavior before would have had temp climbing beyond half and fan never coming on into a overheat condition. I did feel the top hose at radiator and it did eventually get hot but stayed cool until engine reached what i assume was rated stat temp.

Seems to be cooling better and I will attempt a fan cycle tomorrow. Wanna let cool and get new plugs in tonight.

One other observation is that o-ring appeared just thick enough to get a seal. Kinda leery about it at first but seems to be holding.

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Old 07-12-2015, 08:12 PM   #30
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Default Re: SC1 Overheating unless moving

That is how an o-ring is supposed to be sized for a rectangular groove. Fan will come on at about 5/8 or a small bit under. If the seat elastomer deforms much the temp indication will drop back to 3/8, some do and some do not.

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Old 07-12-2015, 09:10 PM   #31
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Default Re: SC1 Overheating unless moving

Perty ding dang jazzed!! Temp at half, ran until fan kicked off at temp in pic, and it cooled back to half just like supposed to. Obviously my stat has been bogus for years. What a nard I am.

I did notice my low coolant light does not illuminate at initial key turn with the rest. Might have to look into that.
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Old 07-15-2015, 09:56 PM   #32
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Default Re: SC1 Overheating unless moving

Replaced the Radiator Fan Motor today. I got the new radiator cap as well, but I'll hold off replacing that until I've had some time to see what the new fan motor does for the temperature.

Does the Radiator Fan play into the AC? I feel like the AC started blowing colder once the new motor was in, but it is possible it was just wishful thinking.

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Old 07-15-2015, 10:21 PM   #33
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Default Re: SC1 Overheating unless moving

Yes. Fan is part of AC operation as well. Heat transfer

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Old 07-16-2015, 10:25 AM   #34
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Default Re: SC1 Overheating unless moving

Quote:
Originally Posted by nick.evans View Post
Replaced the Radiator Fan Motor today. I got the new radiator cap as well, but I'll hold off replacing that until I've had some time to see what the new fan motor does for the temperature.

Does the Radiator Fan play into the AC? I feel like the AC started blowing colder once the new motor was in, but it is possible it was just wishful thinking.
if the a/c air warms up while the car sits in traffic & the engine overheats also, all points to a non operating radiator fan...

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Old 07-16-2015, 12:01 PM   #35
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Default Re: SC1 Overheating unless moving

Quote:
Originally Posted by Bildo Baggins View Post
Perty ding dang jazzed!! Temp at half, ran until fan kicked off at temp in pic, and it cooled back to half just like supposed to.
Quote:
Originally Posted by nick.evans
Replaced the Radiator Fan Motor today. I got the new radiator cap as well, but I'll hold off replacing that until I've had some time to see what the new fan motor does for the temperature.

Does the Radiator Fan play into the AC? I feel like the AC started blowing colder once the new motor was in, but it is possible it was just wishful thinking.
Congratulations, guys, two success stories in one thread!
It's always great when you get the car running like it should.

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Old 07-16-2015, 04:41 PM   #36
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Default Re: SC1 Overheating unless moving

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Replaced the Radiator Fan Motor today.....Does the Radiator Fan play into the AC? I feel like the AC started blowing colder once the new motor was in, but it is possible it was just wishful thinking.
Yes, your a/c is probably blowing cooler too, in addition to solving an overheating problem. Think about it; when a/c is used, the compressor is compressing refrigerant, generating heat going to the condenser coil in front of the radiator. Two hot radiators. When a/c runs, the pcm turns on the fan immediately to force air thru both radiators otherwise both suffer - less cooling from a/c and overheating radiator from hot air following from the condenser coil into the radiator. The fan runs to keep both cool in local traffic where it's needed most.

A tip from r12 service methods; when gauging r12 systems, it was recommended to either use a fan blowing into the front of the engine or hang a garden hose spraying a mist into the condenser coils. Older non EFI system cars didn't have electric fans so external fans were needed or a water spray to help cool off the condenser coils which lowered high operating pressures that allowed a parked car to cool off the interior better.

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Old 07-22-2015, 08:05 PM   #37
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Default Re: SC1 Overheating unless moving

It's been a week since I put the new rad fan motor in, and though things are better, they have not been cured. Stuck in traffic for a while this afternoon, the temperature guage went into the red zone. I also am now getting the 'Service Engine Soon' light. I checked the OBDII codes and I'm not certain if any of these would have an impact but they read as:
  • P0113
  • P0133
  • P0301
  • P0401
  • P1134
  • P1133
  • P0507

It seems like lots of these relate to my O2 sensor. (I'm not trying to diagnose these here, just listing them in case any apply to the overheating issue). I'll try replacing the radiator cap next as that was an earlier recommendation, and I ordered one previously. Anyone have any other thoughts on the matter?

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Old 07-22-2015, 08:09 PM   #38
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Default Re: SC1 Overheating unless moving

  • Intake air temp sensor circuit is open or sensor failed.
  • Cylinder #1 misfire, you have an intake leak in the vicinity of #1 intake runner. Might be an injector o-ring.
  • EGR intake or exhaust port is restricted, maybe.
Fix those things, pull PCM B fuse to clear codes and see what comes back.

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Old 07-23-2015, 04:53 PM   #39
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Default Re: SC1 Overheating unless moving

I used the BAFX Bluetooth OBD2 scan tool to read the codes originally. At least one of them said online to try clearing it and see if it comes back as a troubleshooting step.

I used the Torque application that connects to the BAFX device, and cleared the codes. Thus far only the P0113 returned.
When your car gets an error, does that error stay until cleared? Basically I'm asking, could some of those codes have been really old and not really still a relevant problem?
After driving a little more I should be able to see if more return, but I was curious about that anyhow.

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Old 07-23-2015, 05:19 PM   #40
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Default Re: SC1 Overheating unless moving

Yes they could be old as they are in history until it is all reset. The 507 is a high idle and along with 301 indicative of the usual SOHC intake gasket leak so if your idle is not 800 rpm or so you may have a leak. The 113 is the IAT so figure out if it is wiring, connector, or sensor. Car is not going to run correctly with a broke IAT. The app you used is fine but any info other than a code NUMBER is generic and probably ultimately misleading.

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