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Old 06-25-2019, 10:01 PM   #51
moustacio
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Hey everyone,

It's getting warmer here so I thought I would follow up with what's going on. Not sure if my issue is solved but so far so good with my block water temperature gauge being pretty solid between 190-195*F even with a/c running close to 90*F ambient.

Since posting I have done the following:
-Cleaned/sprayed the radiator, intercooler, a/c condenser, and air cooled oil cooler again
-filled in some of the gaps to get better air flow to the radiator
-installed Saab upper radiator tee with 92*C temp switch to trigger low fan speed
-heater hoses and heater control valve

Something that I don't think came up is the possibility of a radiator hose collapsing on a hot motor with higher freeway rpm's. Am I correct to assume that the lower radiator hose to the water pump would be the one that could collapse?

Thanks again everyone for the excellent ideas and suggestions and I'll follow up again either way after summer has past. And lummert, the block temperature sensor I have is an aftermarket mechanical sensor threaded into the drain petcock below the exhaust manifold on cylinder 4. I still have the cylinder head one installed but don't know how to bypass the compensation, it just stays in the middle after warming up to temp.
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Old 06-25-2019, 10:12 PM   #52
TestPoint
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A laser thermometer might add additional bit of information. My radiator was blocked about half way up on the input tank so that it only was about half effective.
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Old 06-26-2019, 06:54 AM   #53
DET17
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Quote:
Originally Posted by moustacio View Post

Something that I don't think came up is the possibility of a radiator hose collapsing on a hot motor with higher freeway rpm's. Am I correct to assume that the lower radiator hose to the water pump would be the one that could collapse?

.
Bottom hose is indeed the "suction hose" ; old school Detroit iron used a spring inside these hoses to prevent them collapsing. Factory Ovlov hose is just reinforced more to prevent the collapse. I'd recommend the OE hose on the bottom just to be certain......
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Old 06-26-2019, 08:34 AM   #54
tryingbe
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How old is the waterpump?
How old is the radiator? What kind of radiator?

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Old 08-07-2019, 04:21 PM   #55
moustacio
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Hey folks,

Thought I would give an update since its been pretty hot here. Also believe I might have come to a conclusion about the high readings as mocambique-amazone suggested at the beginning of this thread. Also, thank you much everyone for the great ideas and help.

I may change the lower rad hose for good measure and in the meantime I have wrapped it in a few place to hopefully keep it from collapsing with duck brand silicone wrap/tape. New 82*C Thermostat, Hepu water pump, Nissens radiator are all in use for under 10K miles.

**I'm thinking that the mechanical temp sensor in the block drain petcock (exhaust side towards the firewall) is giving higher than actual temperature readings on the freeway** Thank you mocambique-amazone for pointing this out right away and sorry for not taking your advice.

Now for the novel:

-I recently had to replace my AC condenser so I made some sheet metal guides to better direct the airflow to the radiator. Also, fit some sheet metal on my 940 e-fan and stock 740 shroud where there was gaps previously. The latter made a large improvement on pulling air through the rad. As previously posted, I also cleaned the exterior of all the coils behind the grill and filled in some gaps above and below the coils.

-Today, while climbing 1000' for 30 miles in 90*F weather and AC on the block temp sensor was showing up to 205*F. As testpoint and ihatevulvapeople suggested I pulled over to the side of the exit ramp to obtain temperature readings. Thermostat housing was 192*F, upper rad hose and drivers side radiator plastic was 188*F, passenger side rad plastic at top was 166*F, mid PS
At 154*F. And, stock temp gauge has never moved from its 12 o'clock position.

I never wrapped the mechanical sensor with anything to act as a heat shield so I am going to give that a go and see if I notice a change. Strange that this only happens at highway speed but likely logical as my car does have to see around 5psi for extended time while gaining elevation. Also strange to me is that running the heater at full blast and/or running the e-fan at high speed will decrease the temperature I see on the gauge by 5-10*F relatively quickly.

I'll update again when I'm certain but this seems to be the cause of all my anxiety and wasted time for everyone reading and helping me along the way.

Thanks everyone
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Old 08-26-2019, 11:33 PM   #56
moustacio
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Hey,

It wasn't too hot during my trip but the car made it just over 1000 miles across country and I never saw the temperature gauge reading from the block drain petcock location get over 190*F. As others have suggested the cause for all of my concern is the positioning of the mechanical sensor.

Seems I enjoy torturing myself with made up problems. Anyway, I thought I would update this again and let y'all know this 740 is still kicking
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