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Username Post: High temp after new thermostat install        (Topic#359023)
Eth727 
Silver Supporting Member
Posts: 268
Eth727
Loc: San Diego
Reg: 04-17-19
12-03-19 12:16 PM - Post#2781445    

Hey guys. I put a new intake manifold and new thermostat. After draining all the coolant, I refilled it with coolant flush and distilled water. I also had the heater on full. I went to drive it around the neighborhood and the temp gauge went to HOT. I turned around to head home and the temp went down to 3/4 hot. I'm concerned since the old thermostat only went 1/4 temp. When I drained the coolant I was on a little bit of inclined driveway. I filled it with 2 containers of coolant flush and 4 gallons of water. I was surprised that it didn't take more water because the coolant capacity is 18.5 quarts.
Any ideas on why the temp gauge went up so high in such a short drive and went back down again?
Thanks



 


corvesy 
"4th Year" Gold Supporting Member
Posts: 706
corvesy
Reg: 08-07-08
12-04-19 06:02 AM - Post#2781477    
    In response to Eth727

Its possible you may have a faulty thermostat ( even thought its new). You could remove the thermostat and put it in a pot of heated water and see if it opens.



 
Tri5man 
Valued Contributor
Posts: 3809
Tri5man
Loc: Possums Crotch, KY
Reg: 06-26-07
12-04-19 07:16 AM - Post#2781481    
    In response to corvesy

Is the thermostat in backwards?



 
Eth727 
Silver Supporting Member
Posts: 268
Eth727
Loc: San Diego
Reg: 04-17-19
12-04-19 12:21 PM - Post#2781489    
    In response to Tri5man

I put it in the correct way. Do you think there might be air in the system?




 
Mel Foye 
*VIP* Founding Member
Posts: 4934
Mel Foye
Reg: 09-29-00
12-04-19 04:52 PM - Post#2781503    
    In response to Eth727

I think the reason you did not take as much fluid as you thought it should was either there was still some in the system or air in the system.
Possible old or new stats were faulty. Were they both the same temps?
Las Vegas odds are on air in the system.




 
ragtp66 
Contributor
Posts: 827
ragtp66
Reg: 12-09-07
12-05-19 10:08 PM - Post#2781569    
    In response to Eth727

Where is your temperature sending unit located? In the head or in the intake?

Did you use teflon tape to install it?

Is the sending unit new? aftermarket/reproduction or original?

I would get an IR gun and see what your ACTUAL temperatures are reading. If you are using teflon tape on the sender threads you need to remove it and use thread sealer. Teflon tape interferes with the grounding which is why the factory never uses it. If you did not I would also go back and use thread sealer on your intake bolts as well as it keeps oil from wicking up the bolts and puddling on the intake.

Toys:
1958 Impala 2dr Hardtop Under Construction
1966 Chevelle Malibu Convert M20/350 Aztec Bronze
1987 Sea Ray Pachanga 22
2002 Cadillac Escalade EXT Parts chaser
2007 Trailblazer SS -gone and missed


 
1belair1954 
Contributor
Posts: 101

Reg: 12-24-12
12-05-19 10:35 PM - Post#2781570    
    In response to ragtp66

I used to have a 34 chevy Hotrod that would get an airlock a good trick is to drill 2 x 1/8" holes in the thermostat valve disc. Lets air out and thermostat still works not sure a 58 to 60 chevy has this problem?



 
Eth727 
Silver Supporting Member
Posts: 268
Eth727
Loc: San Diego
Reg: 04-17-19
12-06-19 01:17 PM - Post#2781600    
    In response to 1belair1954

I had put teflon tape on the sending unit. I removed it and put thread sealant. Before I corrected the sending unit I had put pipe plugs to isolate the heater core. I still got a high temp reading hence why I removed the teflon tape on the sending unit. It is mounted on the intake manifold.



 


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