High temp on cold block


jl2tx
10-24-2004, 11:37 AM
"92 s-15 jimmy- Started having temperature problems 3 wks ago.Now replaced t-stat x2(yes i tested the 2nd one),replaced rad.cap it wasnt holding pressure, replace tensioner it was faulty,flushed system.Now when engine has cooled off if i get on hwy after approx. 2 miles temp. shoots up to 210,stays a few minutes then drops again to normal range.If the block is already warm it stays in normal range.If I speed up when it is hot the temp will drop some.

BlazerLT
10-26-2004, 07:00 PM
How is the coolant level in the rad when the engine is stone cold?

jl2tx
10-27-2004, 10:22 PM
The coolant level is full.

BlazerLT
10-27-2004, 10:32 PM
I reread your first post and I do believe your coolant system is perfectly fine.

It is completely normal for the temperature to go to the 210 range before the thermostat pops opens and then it will level out.

jl2tx
10-27-2004, 11:24 PM
i appreciate the input.

BlazerLT
10-27-2004, 11:32 PM
no problem, I too one time thought that something was wrong but the mechanic told me it is perfectly normal and he was correct.

jl2tx
11-17-2004, 01:21 PM
still doing it - now gauge goes to 260 chk gauge light comes on but only at certain speeds(60-70 & below 25 for extended periods.)cant afford for mechanic to check it.please help me.

BlazerLT
11-17-2004, 03:35 PM
Replace the rad cap and go have your cooling system reverse flushed.

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