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#1 |
Board Member
Join Date: Jul 2015
Location: Portland, OR
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![]() Lately now, if my car sits longer than 30 seconds-1 min, it starts to blow cold air and heat seems to not work at all.
Also it seems to be that the fan turns on and sounds like it’s going crazy any time it sits longer than 30secs to a minute. Car doesn’t overheat and no condensation that would normally occur from a bad heater core so I’m really not sure what it would be...
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I'm just here for the soccer moms and grandmas |
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#2 |
On the Hill
Join Date: Apr 2007
Location: The Hill, Shinshu Japan
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![]() You need a new thermostat.
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"Two roads diverged in a wood, and I... I took the one less traveled by, and that has made all the difference." Robert Frost Lifeboat for the plankwalkers/otherwise disenfranchised. |
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#3 | |
Board Member
Join Date: Aug 2017
Location: Charleston
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![]() Either that or you are low on coolant
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My build thread: http://forums.turbobricks.com/showthread.php?t=340910 |
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#4 |
Board Member
Join Date: Aug 2011
Location: Hungary
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![]() Coolant slowly circulates through the heater core while it is idling, thus cool air can quickly cool it back. Either the heater valve cant open fully, or there is blockage or limescale in the heater circuit.
Whats up with the fan? Which fan? Heater fan or e-fan at the radiator?
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1980 Brown 244 GL ![]() |
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#5 |
Board Member
![]() Join Date: Dec 2006
Location: Rushing Lane, Scappoose, OR
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![]() Do you still have that heater control valve under the hood that is plastic and likes to blow up? I'd ditch that.. It's right behind the head hooked into the heater hoses. Controlled by a vacuum line.
On my 91 740 has that one flapper that opens cold air from outside and it is electric and it was stuck open. I had to swap that for one that worked, you know closes the cold air from outside. Other then that vacuum operates the other flappers and that heater control valve maybe you got vacuum leak and stuff ain't working like it should at idle..
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1988 245 White slicktop M47 Wagon! 2.5L NA 8v going in. 1990 745 B230FT Getrag JohnV flywheel 240mm clutch 13c A-cam 3.54 G80 548K MILES 1991 740SE B230FT NPR Strut braces IPD bar A cam 550cc EV14's. 3.73 G80 M90 to put in. ![]() |
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#6 |
Board Member
Join Date: Jul 2015
Location: Portland, OR
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#7 |
Board Member
Join Date: Jul 2015
Location: Portland, OR
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![]() I just checked and I am a little low, the car doesn’t overheat though so I don’t think it’s quite that low. But would having low coolant simply be enough to do this?
Also if I do replace my thermostat, I might as well do a coolant flush while I’m there? |
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#8 | |
Board Member
Join Date: Jul 2015
Location: Portland, OR
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![]() Quote:
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#9 |
Board Member
![]() Join Date: Dec 2006
Location: Rushing Lane, Scappoose, OR
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![]() Take it out and one of the hoses and just attach the other hose that also went to valve to the firewall instead. Or put connector pipe where the valve was. That valve blew up on that 940 wagon I bought the other day, blew head gasket cause I kept driving..
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#10 |
Enough already!
Join Date: Oct 2009
Location: CT
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Differences of opinions should be tolerated, but only if they're not too different. - Sharon Craig |
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#11 |
Moderator
Join Date: Mar 2003
Location: Monroe, OR USA
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![]() On a 7/9 series if you don't have any coolant in the overflow bottle, you may be low enough on coolant that the heater core does not get a steady flow of coolant. You have to be about 1/2 gallon low to cause that problem.
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#12 |
Board Member
Join Date: Jul 2015
Location: Portland, OR
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![]() After topping off the overflow bottle with 50/50 water and Volvo coolant, the heat seems to have come back. I’ll update again in a few days just to make sure that was indeed the problem
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#13 |
Board Member
Join Date: Jul 2015
Location: Portland, OR
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![]() To fully confirm, my heat is now working perfectly. The electric Fan doesn’t kick on either, so it seems that being low on coolant is enough to cause your heat not to work. Thank you everyone for all the help!
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#14 |
Moderator
Join Date: Mar 2003
Location: Monroe, OR USA
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![]() Cool. Or should I say, warm?
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#15 |
Board Member
Join Date: Jul 2015
Location: Portland, OR
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![]() A Parian Hilton “That’s Hot” will do
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