Coolant temp low

[Bwhntr6]

Hello everyone I have an 03 Tahoe with coolant temp issues .operating temp doesn’t seem to go over 185 even after thermostat seems to open.verified with scanner.had water pump and thermostat replaced also low heat in cabin . was wondering if coolant temp sensor would have anything to do with it

 

[Fless]

How long has this been going on? If recent, what changes were made just before the issue arose?

What is the thermostat temp (believe it should be 195-ish)?

Has the radiator been replaced? (is it OE or aftermarket?)

Has it ever warmed up properly?

 

[Bwhntr6]

How long has this been going on? If recent, what changes were made just before the issue arose?

What is the thermostat temp (believe it should be 195-ish)?

Has the radiator been replaced? (is it OE or aftermarket?)

Has it ever warmed up properly?

.

 

[Bwhntr6]

Been about 3 or 4 months water pump and thermostat have been replaced .thermostat should be 186. original radiator.guage used to run strait up about 210

 

[bottomline2000]

whats the temps like where you are and have you checked the heater hoses to see if they are both hot? You may have combination of a stuck clutch fan and/or clogged heater core. leaning towards clutch fan since clogged heater core wouldn't result in lower tstat temps.

 

[Bwhntr6]

35F and both hoses are hot .will check clutch fan

 

[Fless]

You are correct with the 187° thermostat. If you have the old thermostat take a look at it to see what temp it was.

 

[Bwhntr6]

Don’t have old part was defective . Fan seems to spin free when cold

 

[Bwhntr6]

Thanks for the input.will check a few more things

 

[Bwhntr6]

What is actual operating temp for a 03 Tahoe

 

[SnowDrifter]

Mine is between 208 and 214 depending on speed and load on my 05. Temps measured via scan tool

 

[swathdiver]

What is actual operating temp for a 03 Tahoe

The needle sits at 210 on purpose, so as not to alarm the drivers and have them all rushing in to the dealer when they're new. I just had a thought, with all the computer programming these days, they should let it read actual temps the day after the warranty expires! LOL

Anyhow, the thermostat is 187 and they usually run within 10-15 degrees of that in a healthy system.

What brand water pump and thermostat did you use as replacements?

 

[Bwhntr6]

Another new thermostat and temp sensor fixed temp problem.heater controls in cabin were bad great heat now .thanks everybody for the input