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1993 deville
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92 Posts
Discussion Starter #1
93 deville, been chasing down a heat problem and found out it was because i was losing coolant, so i thought..i was in fact losing coolant and couldnt for the life of me figure out where it was going and when my belt was soaked i couldnt figure out where it was coming from..so i was tinkering with it to see if it was the water pump yesterrday and when i took off the res. i seen the line to the rad. was kinked and had been for a long while before i had the car, i started the car and let it warm up with the line kinked, the system would build up so much pressure it would just shoot coolant out all around the rad. cap and not puke back into the res. tank...fixed that and coolant levels are fine and fluctuate in the res. when hot and cold like i think it should

heres where im kinda stumped-i warm up the car and the heat works, i go to the gas station and by the time i get there its not blowing hot anymore(only a 2 mile trip)..so i get out of the gas station and check the temp via data center and it was 181 degrees, i let it idle and it warms up to 203 degrees...i drive 2 miles back home and check the temp again right away and it was back down to 185 degrees...anybody have a clue? all three lines at the T are equally hot...:hmm:
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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86,781 Posts
Did this just start happening?
Sounds like you have air in the system. Make sure your radiator cap is not all gunked up from cooling system sealant tab residue. That cap is a two way valve. As coolant heats up and expands, it goes into the reservoir tank. As it cools and contracts, it gets sucked back into the tank (assuming the reservoir has coolant in it. Otherwise it sucks air). If the cap is working properly, any air in the system will get purged and little at a time with each expansion cycle and replaced with coolant with each contraction cycle until there is none left.
 

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Registered
1993 deville
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92 Posts
Discussion Starter #3
its def. been happening since ive had the car, the line that was kinked from res. to rad. looked original ... maybe it just needs a few more cycles to burp everything out?
 

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Registered
1993 deville
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92 Posts
Discussion Starter #6
ive had the car for about 4 months id say....

so do you think this sounds like a t stat stuck open?
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
181 sounds a bit too cold. My mothers '90 Seville had a sticking thermostat. Once replaced, I don't think I ever saw it go under 195 or so. Really easy job on a 4.X, and very inexpensive part. Go grab a Stant at any parts store, OE temp, and give it a shot.
 
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