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Posted: 1/1/2006 4:55:53 PM EDT
My 92 Blazer (fullsize 5.7L) isn't heating up according to the gauge. It usually runs at 190-200 degrees, but lately its only been heating up to 140 or so. I changed the thermostat and it still only gets up to 140. The heat works fine.

I talked to a mechanic and he said as long as the heat and eveything is working fine not to worry about it. Its possible the gauge is wrong, as my oil pressure gauge hasn't worked in 5 or 6 years, but any other ideas?
Link Posted: 1/1/2006 6:55:32 PM EDT
Link Posted: 1/1/2006 8:25:28 PM EDT

Originally Posted By Striker:
Just taking a stab in the dark here but..do you have a clutch type fan? If so..is it still working or is the clutch part seized up making the fan turn all the time?



I'm not sure. How do I know if I have a clutch type fan? I'll check tomorrow to see if the fan is on when I first start it up.
Link Posted: 1/1/2006 8:31:49 PM EDT
Check to see if your radiator cap is any good. I had a Ford 5.0 that had a bad cap and it would freeze me out in the winter until I replaced the cap. It wouldn't seal and allow pressure to build in the cooling system that it needs to work properly.
Link Posted: 1/1/2006 9:13:38 PM EDT

Originally Posted By Camel:

Originally Posted By Striker:
Just taking a stab in the dark here but..do you have a clutch type fan? If so..is it still working or is the clutch part seized up making the fan turn all the time?



I'm not sure. How do I know if I have a clutch type fan? I'll check tomorrow to see if the fan is on when I first start it up.



A clutch type fan would have a big ol' aluminum housing behind the fan blades, an electric fan would have an electric motor
Link Posted: 1/2/2006 3:52:36 AM EDT
Link Posted: 1/2/2006 4:10:45 AM EDT
Most people will complain about a ROARING noise if a clutch
fan is locked up . They get pretty loud at 3K RPM's .

It also wont effect operating engine temp with
a working thermostat . The stat would close off
flow below it's operating temp to keep the engine hot .
That's why it's there .

Since you say the heat is fine . It's more then likely
that your gauge or sender is faulty . If coolent temp
was actually 140° then you would only be getting
around 100° out the vents . Where normal is 150-160°


Link Posted: 1/2/2006 5:00:56 AM EDT
brings up a good point, if the temp gauge is faulty, is there anyway to measure coolant temp with say an old fashioned thermometer without getting scalded? Everything's under pressure so you cant just pop the radiator cap and stick a probe in there.

I never diagnosed temp gauges, I'm guessing if the temp sensor is electronic you can test it's voltage output with a volt meter and at least determine if the sensor is working or not
Link Posted: 1/2/2006 7:41:12 AM EDT
Probably a bad sender.
Link Posted: 1/2/2006 6:48:21 PM EDT
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