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Motor heat-up issue on going with gsum 1991 bmw 525i
1991 BMW 525i

Motor heat-up issue on going with gsum 1991 BMW 525i

(1991 BMW 525i)
Heat up issue cont...New w-pump, therostat, flushed engine, system bleeding done. At operating temp. car rad has pressure. Re-flushed engine...while doing so discontect return rad hose...ran water through sytem...pumps out re-turn hose...hot. When I hook all hose up, bleed system and
run...found top feeder rad hose get normally hot...However, the return hose remains cool?? Odd cuz while checking return hose out put while disconnected the coolant flows through motor. System hoses hook up...both get hard can't squeez them. Stop engine with hoses hook up...squeez them both...pressure from each does push coolant up and out the open rad cap??? Does any one have any thoughts on this problem? Car from motor cold to about 2 miles out hits RED
zone...Temp of motor at that point is valid...HOT!!!!
HELP!!!!
2 answers & 2 comments
Popular Answer
of Greg's Orange Auto on July 26, 2012
poss headgasket issue. have a chemical block test done to ck for hydracarbons in cooling system
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on July 26, 2012
Hey Greg's Auto...

gsum with reply to your suggestion on the bimmer heat up issue...did the chem test for hydracarbons yesterday.
That is not the issue??? I am 70...somewhat of a motor head comin up through the 50s-60s...This animal has me baffled BIG time. gsummers@woh.rr.com direct hook up. gsum
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of Greg's Orange Auto on July 26, 2012
poss headgasket issue. have a chemical block test done to ck for hydracarbons in cooling system
Sign in to reply
on July 26, 2012
Hey Greg's Auto...

gsum with reply to your suggestion on the bimmer heat up issue...did the chem test for hydracarbons yesterday.
That is not the issue??? I am 70...somewhat of a motor head comin up through the 50s-60s...This animal has me baffled BIG time. gsummers@woh.rr.com direct hook up. gsum
on July 26, 2012
Just saw this post after replying on the earlier one. You say it goes from cold to red in about 2 miles.... I'll repeat what I stated in the other post.at cold start with closed system, does the rad hose go from litlle pressure to lots of pressure within a half-a-minute or so? Also something easy to check- - do you have one of those funnel adapters for the radiator fill? If so , do bubbles come out while running and what does it do when you rev the engine? 50s& 60s cars huh? Think old school , those diagnostic techniques are what tought and designed the 'new school'. Also one other thing --- again , don't want to sound insulting ,cause it sounds like you've got more patience than me , but...........any chance the t-stat could be defective or is it possible on that set-up , for it to go in in the wrong direction? God I hope some else has some better answers!!!....One other random thought Radiator sludged causing restriction? compare heat issue inside to what you already said --could be air in the system causing low heat output. Does the heat improve if you rev it up then cool down when you let off the throttle?
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of Greg's Orange Auto on July 26, 2012
i agree with thermostat issue poss backwards?

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