temperature gauge heat issues

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temperature gauge heat issues

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temperature gauge heat issues - 3/25/2008 6:06:31 PM

graysilm

Posts: 7
Joined: 1/9/2008
Status: offline

On my 1999 Tahoe all of a sudden my temp gauge has started going haywire. At a stoplight it will rise up near the red, and when I accellerate the gauge drops down to a cooler temp than it should be. When the temp gauge is way up my heat blows out cold air, and when it goes down the heat blows hot air. My first guess would be to replace the thermostat, but I'm not sure if thats the problem and I don't want to do anything that is unnecessary. What the heck is going on here? Thanks

Post #: 1

RE: temperature gauge heat issues - 3/25/2008 7:53:42 PM

mitchell03

Posts: 33
Joined: 2/16/2008
Status: offline

I would say the thermostat is sticking so when stuck shut it gets real hot but also keeps the hot fluid out of the heater core then when it opens it gets to the heater core and alows it to flow and get cool.

(in reply to graysilm)

Post #: 2

RE: temperature gauge heat issues - 3/25/2008 7:58:23 PM

graysilm

Posts: 7
Joined: 1/9/2008
Status: offline

well I guess I will go ahead and replace the thermostat and see if that fixes the problem. thanks

(in reply to mitchell03)

Post #: 3

RE: temperature gauge heat issues - 5/13/2008 12:49:21 PM

mySuburban

Posts: 1
Joined: 5/13/2008
Status: offline

Did the thermastat repair the issue with the Gauge?

(in reply to graysilm)

Post #: 4

RE: temperature gauge heat issues - 5/28/2008 4:41:43 AM

golfer

Posts: 610
Joined: 10/8/2006
Status: offline

quote:

I would say the thermostat is sticking so when stuck shut it gets real hot but also keeps the hot fluid out of the heater core then when it opens it gets to the heater core and alows it to flow and get cool.

Not sure about that.

Typically the plumbing for the heater core is taken before the thermostat .... as a bypass.

When it's cold and the engine temperature isn't up the thermostat would be closed .... meanwhile the water pump is circulating coolant through the heater core and on to the rad ........ even though the thermostat is closed .

If you have a thermostat that is stuck in the closed position ... you can offset the over heating by turning on the heat setting inside the cab. since the heater core is a small second rad.

It would seem strange the thermostat would close shut when the vehicle comes to a stop and suddenly open when it accelerates.

In this case I would be inclined to check the flow through the water pump. At a stop the flow seems to be reduced and at acceleration it seems to increase.

Just a thought.

(in reply to mySuburban)

Post #: 5