High Temp.
Thread Starter
Advanced
Joined: Oct 1999
Posts: 52
Likes: 0
High Temp.
Hello Everyone:
My current condition may be normal but I wanted to check with the forum to see if I should be worried. When I start my 84 the temp climbs to 229 and then drops like a rock to 180 and stays there. My question and concern is if this is a normal condition? It seems pretty high to me before it stablizes. It runs perfect all the time but the high temp scares me. Any thoughts?
My current condition may be normal but I wanted to check with the forum to see if I should be worried. When I start my 84 the temp climbs to 229 and then drops like a rock to 180 and stays there. My question and concern is if this is a normal condition? It seems pretty high to me before it stablizes. It runs perfect all the time but the high temp scares me. Any thoughts?
Safety Car
Joined: Aug 2009
Posts: 3,750
Likes: 275
From: Melbourne, Victoria, Australia
Hello Everyone:
My current condition may be normal but I wanted to check with the forum to see if I should be worried. When I start my 84 the temp climbs to 229 and then drops like a rock to 180 and stays there. My question and concern is if this is a normal condition? It seems pretty high to me before it stablizes. It runs perfect all the time but the high temp scares me. Any thoughts?
My current condition may be normal but I wanted to check with the forum to see if I should be worried. When I start my 84 the temp climbs to 229 and then drops like a rock to 180 and stays there. My question and concern is if this is a normal condition? It seems pretty high to me before it stablizes. It runs perfect all the time but the high temp scares me. Any thoughts?
You can fit aftermarket ecm chip and a colder t/stat.
If your water level is low or the t/stat bypass hole in block to bottom hole to water pump is blocked that can also explain your t/stat opening delay and or your thermostat is on the way out.
I have seen my vette do it once or twice in the past.
Advanced
Joined: Oct 2012
Posts: 76
Likes: 0
From: San Diego CA
That could be normal, assuming the warmup takes awhile passing 195F.
It should reach the thermostat setting, then actually drop a few degrees and hover there a minute or two before creeping up higher. Basically the thermostat is opening and the cold stuff in the radiator, and cooling of the radiator slows it down. Then at 228 the fan comes on, and brings it down to 218, then it repeats.
It should reach the thermostat setting, then actually drop a few degrees and hover there a minute or two before creeping up higher. Basically the thermostat is opening and the cold stuff in the radiator, and cooling of the radiator slows it down. Then at 228 the fan comes on, and brings it down to 218, then it repeats.
Safety Car
Joined: Aug 2009
Posts: 3,750
Likes: 275
From: Melbourne, Victoria, Australia
The temp sensor is in the head and will react more quickly than the thermostat, if there is no bypass flow past the thermostat the hot water will not reach it quickly having to rely on all the water heat conducting to the thermostat.
Also if your coolant (water) level is low it may not be touching the thermostat. Either way running the heater when you start the car till its warm will tell you, t/stats do have a slight weep hole to allow water to flow slightly you can drill a 1/8 hole to help get the water thru the thermostat.
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
Hello Everyone:
My current condition may be normal but I wanted to check with the forum to see if I should be worried. When I start my 84 the temp climbs to 229 and then drops like a rock to 180 and stays there. My question and concern is if this is a normal condition? It seems pretty high to me before it stablizes. It runs perfect all the time but the high temp scares me. Any thoughts?
My current condition may be normal but I wanted to check with the forum to see if I should be worried. When I start my 84 the temp climbs to 229 and then drops like a rock to 180 and stays there. My question and concern is if this is a normal condition? It seems pretty high to me before it stablizes. It runs perfect all the time but the high temp scares me. Any thoughts?
but 229 is not high. if fan is not on, it may not be an accurate gage.
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Drifting
Joined: Sep 2003
Posts: 1,363
Likes: 7
From: 1994 LT1 Coupe 6-speed with FX3 & 2000 LS1 Vert 6-Speed with F45 Hunterdon County, NJ
Given the traditional coolant flow direction of your year/engine (hot water exits thermostat), absent of a infrared heat-gun, you could use your hand to determine when the thermostat opens just by feeling for when the hose connected to the thermostat housing gets warm/hot and compare to the temperature gauge. If the hose doesn't gets hot until about 229, then that will confirm that the engine hot coolant is not reaching the thermostat to cause it to open.
This is likely occuring because air is underneath the thermostat. which could be caused by never having been properly bleed, or a leaking head gasket or a failing water pump or if there is a blockage in an air-bleed bypass hose or passageway.
Last edited by theadmiral94; Oct 24, 2012 at 10:20 PM.