Summer Desert Temp Readings

[Flank]

I am in Vegas, we are running some 108 Deg to 112 Deg temps here right now, just hooked my Scanguage up to my 95 (with 210k miles) in for some Before readings in prep of doing a fan clutch replacement (not hearing fan roar at start up).

I was kind startled by my readings and want to hear what other people are getting in the hot desert with a stock or other setup.

At operating temp on the freeway, I am normally running 198 deg water temp, and have seen regular up to 209-212 deg at stoplights with one spike today up to 219.

My intake temp will vary from 140 deg to 160 deg, and on one incident of prolonged idle, in the shade, it spiked to 190 deg.

Plans in the next week include a new blue fan clutch drained and filled with 10K fluid, don't know if the stock FC has ever been swapped. This winter, I did a total flush (rad and block) and new refill with Red, new PHH, etc.

Will take readings after the fan clutch swap, but still interested to know what other Desert Rats are getting. If the high temps remain, will most likely cut louver vents in the hood. REALLY don't want to do a HG any time soon, new baby due about 5 weeks.

Thanks in advance for your input.

 

[ShawnTRD]

Tuning in

 

[thumper]

I had some high(er) temperature issues a few summers ago before I replaced all the cooling system components. I don't live in the inferno that is known as vegas, but spend time between bay area and northern nevada. My temps were regularly over 200. After changing radiator to older style, new thermostat, new water pump, new blue fan clutch with stock fluid, phh, all hoses, temps came down to 184-186 for normal temperatures. Now that I have a supercharger, temps rose a few degrees, normal is 188-196 or thereabouts. As for the intake temperature, not sure you can rely on that for more than a guess. This past week at the nevada house, outside was 100ish for most of the week. The air intake temp said anywhere from 119-140. I KNOW it wasn't that hot there lol.

Forgot to add, going up both sides of Donner Summet, temps hit 204-206 i think. AC was off.

Hope your maintenance gets the temps down.

Jon

 

[gahi]

when its hot out, I run 198 when going down the highway with the ac on. showed 213 the other day pulling a big hill at 80 mph, 105 outside temp.

 

[hzavarce]

My temps are about the same as yours with the 100-105 TX heat

A few days ago I replaced my rad with the older style, and did not notice a big difference. However, the aux fan works much better. After a few minutes I get a 5F drop with the AUX fan on. With the old rad I did not even see a change

 

[Flank]

So, I'm not the only one.... At what temp point do we worry worry about blowing head gaskets?

 

[TexasJack]

You should see some indicators of head gasket problems....like you are using up your coolant reservior and having to refill it.

I live in Dallas and the thing I hate the most about the really hot weather is that the air conditioner has a hard time cooling the car in slow traffic.....same problem out there?

By the way,

Love the quotes in your signature block:

"Recession is when your neighbor loses his job. Depression is when you lose yours. And recovery is when Obama loses his."

“The problem with socialism is that you eventually,
run out of other people’s money.” – Margaret Thatcher

I couldn't agree more!

 

[bigbluefj]

My temps are about the same as yours with the 100-105 TX heat

A few days ago I replaced my rad with the older style, and did not notice a big difference. However, the aux fan works much better. After a few minutes I get a 5F drop with the AUX fan on. With the old rad I did not even see a change

I replaced my rad with an older style?? please explain this for me??

 

[arndog123]

He replaced it w/ the earlier style (93-94) which IIRC are made of brass and slightly bigger. Later style rads are made of aluminum.

 

[plutonius]

Before I redid my entire cooling system I was running right around 200 in the summer heat, with spikes to 214 up mountain passes. Right now in the LA heat (hot but not as hot as Vegas) I'm running 186-190 on average, and the highest I've hit is 206, and that was up hill on the freeway at 75mph in 100º with the AC on. I saw the intake temp hit 150º the other day. I've been out to Palm Springs/Joshua Tree a few times recently and noticed marginal increases in water temps. Also I sealed up as much of the gap around the fan shroud with foam rubber stripping and according to the Scangauge it dropped my temps by 2-4º. I have a pair of Pontiac GTP louvers in the garage waiting for the cajones to cut up my hood, but it doesn't seem to be a necessity yet.

BTW where is the temp sensor for the intake temp?

 

[hzavarce]

He replaced it w/ the earlier style (93-94) which IIRC are made of brass and slightly bigger. Later style rads are made of aluminum.

Correct

 

[1972FJ55]

Here in Tucson, I'm typically seeing 186-192 under most conditions. I did see as high as 204 going up the backside of Mt. Lemon this past weekend. Stock '97 with 215k.

 

[bigbluefj]

He replaced it w/ the earlier style (93-94) which IIRC are made of brass and slightly bigger. Later style rads are made of aluminum.

What is this IIRC??

 

[arndog123]

IIRC = If I Remember Correctly

 

[Flank]

Either this weekend or next, I will replace the fan clutch with a blue and add the 10K fluid. Will post up any temp changes. I have also ordered the Grand Prix GPX louvers, will probably throw those in this summer as well.

I believe (can anyone confirm) that the intake temp is taken at the Mass Airflow Sensor. So two things are going to affect this - outside ambient air temp and how hot your engine is. Try opening up your hood when the truck is hot and touch your airbox - SSSSSssssssss. That is why venting engine head should help this all.

 

[96r50]

Either this weekend or next, I will replace the fan clutch with a blue and add the 10K fluid. Will post up any temp changes. I have also ordered the Grand Prix GPX louvers, will probably throw those in this summer as well.

I believe (can anyone confirm) that the intake temp is taken at the Mass Airflow Sensor. So two things are going to affect this - outside ambient air temp and how hot your engine is. Try opening up your hood when the truck is hot and touch your airbox - SSSSSssssssss. That is why venting engine head should help this all.

Yes, the IAT is measured by the MAF.

I don't live in a hot area like you, but it seems to me that Toyota knew what they were doing when they designed these rigs to run all over the world in high heat areas. If you want to cut holes in your hood by all means go ahead, but there should be other less invasive methods of solving your problem. I'd start with the fan clutch (as you are) but from everything I've read on the topic, I'd either put 10k in a stock black hub Aisin or 15k-20k in the new blue hub. I went from 10k to 15k in my blue hub this summer, and temps never pass 190F, even when the ambient temps hit 95F for a week. If I go back in there I'll probably swap the fluid to 20k, but 15k is working well for me right now.

If you use the blue hub clutch and have the original black hub Aisin fan clutch sitting around that you don't want, I'd be interested in it.

 

[dgerst]

I'm running as high as high as 208 uphill in 110F weather A/C on. Idling runs around 203. Stock '97 LX w/113K. 10K in the clutch below if anyone can identify it. You think 20-30K would help much?
https://forum.ih8mud.com/80-series-tech/404015-97-fan-clutch.html

 

[Dave 2000]

What is this IIRC??

I know you know what it means now but.......I am sure there was a thread on MUD that listed all the meanings to:

BTW = By the way

OTOH = On the other hand

ect acronyms....is that spelt right?

There was a whole bunch of them IIRC, BTA, IANSS

regards

Dave

 

[Brian894X4]

With the temps going up at idle, it sounds like you might have issues with a worn fan clutch that any clutch replacement...either OEM or the fan clutch mod will probably at least help with.

If you have the stock radiator, you might also check to see if there's any sludge in there. No amount of flushing will get rid of the sludge and its sometimes not always obvious since we can only see a small part of the radiator through the cap. Feel around, especially towards the ends of the radiator, where it likes to collect in the low pressure area and block off tubes, reducing radiator capacity. If you find sludge, the best option, although not the cheapest, is probably a new radiator. The ironic part is, the part of the radiator we can see through the cap is usually not the part where the sludge collects, and since it doesn't all come out during the flush, most people have no idea its there and since the factory temp gauge reads the same for a wide range of temps, only after we install a scan gauge do we realize that there's an issue.

 

[94SRUNNER]

Flank...just curious about your progress on your cooling system overhaul. Have you brought down those temps?