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		BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 5-Series (E12,E28, E34, E39, E60)
Heat blows cold then hot ????

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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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04-18-2007, 01:30 AM	#1 (permalink)
slate530i n00b Join Date: Nov 2006 Car: Posts: 16 Photos: 0	Heat blows cold then hot ???? I have an 01' 530i and when I turn on the heat after I see that the car has warmed up, it blows out cold to room temp. Then later on in my drive it will blow out hot to very hot. Then it will go back to cold again. I'm not sure what the problem is. Any ideas?

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04-18-2007, 07:13 AM	#2 (permalink)
da_bull da_administrator Join Date: Jan 2005 Location: Mooooossouri Car: Its slow, gotta M20 in it Posts: 3,847 Photos: 0	You may want to check your coolant. It may be low even though your gauge reads fine. __________________ -There are 10 kinds of people. Those who understand binary, and those who do not. -There's no place like 127.0.0.1 -"Wheel Sucks"

04-18-2007, 09:22 AM	#3 (permalink)
Teh Prof I am Teh Edumacator. Join Date: May 2005 Location: ATL and NYC and CO Car: 1999 Dinan 540i/6, 1995 Dinan 749 Posts: 3,961 Photos: 0	May also be your heater water valve or your heater core. __________________ 1999 E39 540i/6-VF Stage 1 S/C, Dinan exhaust, Dinan strut+shock braces, Dinan ltwt flywheel + clutch, Dinan Brembo BBK, Dinan monoball, H&R Springs, Koni Yellows, M5 sways, Dinan forged 18" wheels, &c. 1995 E38 740iL. Highly modded. Faster than you. Sold 2-28-07: 1997 E36 M3/4, 8-30-05 RIP 1997 528i Lindsay fan club member.

04-18-2007, 10:10 AM	#4 (permalink)
slate530i n00b Join Date: Nov 2006 Car: Posts: 16 Photos: 0	Thanks. Do you think there could be an issue with the thermostat?

04-18-2007, 10:17 AM	#5 (permalink)
Teh Prof I am Teh Edumacator. Join Date: May 2005 Location: ATL and NYC and CO Car: 1999 Dinan 540i/6, 1995 Dinan 749 Posts: 3,961 Photos: 0	lol there is always an issue with the thermostat on the E39, the issue is that it sucks. Could yours be stuck, well yeah, how many miles ago was the last time you replaced it? __________________ 1999 E39 540i/6-VF Stage 1 S/C, Dinan exhaust, Dinan strut+shock braces, Dinan ltwt flywheel + clutch, Dinan Brembo BBK, Dinan monoball, H&R Springs, Koni Yellows, M5 sways, Dinan forged 18" wheels, &c. 1995 E38 740iL. Highly modded. Faster than you. Sold 2-28-07: 1997 E36 M3/4, 8-30-05 RIP 1997 528i Lindsay fan club member.

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