No Rear Heat

No Rear Heat

Postby Fingaluna [OP] » January 30th 2008, 7:06am

Hi All,

The rear heat in my 98 Extended is down. The fan blows nice & hard, but there's no heat. There is heat in the front (although the fan is weak, likely a resistor issue) so no worries there!

Any advice?

Thanks,
Matt
1998 Astro 4.3 Extended
1994 Biodiesel Jetta (the Baconcar)
1981 Yamaha Virago 750
1965 Vespa 100
& 2 1972 1/16th Horsepower feet
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Re: No Rear Heat

Postby chemist » January 31st 2008, 12:55am

Check your hoses, and check your heater core. The heater core is under the dash. Have you smelled a coolant odor in your cabin ever?
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Re: No Rear Heat

Postby coolen » January 31st 2008, 12:36pm

there is a valve under your van that regulates the rear heat. this is a common problem.
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Re: No Rear Heat

Postby e7ats » February 5th 2008, 2:53am

Coolen is on the right track. Inspect the 2 vacuum lines that run from the fire wall down to the valve. Lots of times they will rot and cause the valve to stay closed.
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Re: No Rear Heat

Postby MusicETC » February 6th 2008, 12:52am

Does anyone have pictures of the valve in question??
2000 GMC Safari
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Re: No Rear Heat

Postby nitropyro » February 8th 2008, 3:25am

you have 2 heater cores the second behind driver seat on wall behind plastic panels my friends just went bad. he had no heat wet carpet he said under 1 hour to have it fixed.
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Re: No Rear Heat

Postby coolen » February 8th 2008, 1:35pm

i'll snap a pic of the valve sometime today. then i'll post it for you so u know what you're looking at.
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Re: No Rear Heat

Postby Fingaluna [OP] » February 8th 2008, 8:03pm

Hi Folks,

Thanks for the suggestions so far. I would like to check the vac lines first. Trouble is I don't know what to look for... Any pointers? Do I need to remove the doghouse or any covers? Once I'm in there, what am I looking for? Are they rubber? Anyone have any pics?

Thanks!
1998 Astro 4.3 Extended
1994 Biodiesel Jetta (the Baconcar)
1981 Yamaha Virago 750
1965 Vespa 100
& 2 1972 1/16th Horsepower feet
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I've lost mine too.....

Postby andys » February 11th 2008, 7:04pm

99 AWD. 175 kms.

Camping in the winter. Van at idle for 1 hour+. Made a popping noise. Van filled with smoke/electrical fire smell. Turned off. Looked for fire. No fire. Turned on and looked for abnormalities. No hot air coming out the rear heater!!! We need this back asap or we'll be a soggy mess.

Any ideas?

I'll check the switch and vacuum lines once the pics are posted. My confusion is why the burning smell?

I have access to a warm garage Tuesday night. Any parts I should be buying in the meantime? I can't really get under to take a look until after I visit a car wash. My van is covered with snow and mud everywhere!!!
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Re: No Rear Heat

Postby andys » February 13th 2008, 9:01am

*FIXED* sorta

On my 99 awd there is a vacum controlled water valve under the hood. It's just to the left of the alternator pulley.

The water valve also has a small vacum solenoid attached to it. My solenoid burnt up. THe solenoid switches vacuum to the water valve. I removed the solenoid and connected its two small vacuum lines togehter making a full-time vacuum to the valve.

Heat is back!
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Re: No Rear Heat

Postby timelessbeing » May 21st 2008, 7:17am

I have the exact same problem. I went to the dealer today and they don't sell the solenoid separately. You have to get the whole aux heater water shut-off valve assembly for $200. I'm hoping something like http://www.clarksol.com/html/prodspecsKSV2Way_Valve.cfm will do the trick.
2000 Astro AWD Passenger
4.3L CSFI V6 • 3.73 G80 • 4" OV lift • 30" AT tires
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Re: No Rear Heat

Postby timelessbeing » June 22nd 2008, 9:37pm

By the way, here is a photo of the valve in question.
vacuum valve solenoid.JPG
2000 Astro AWD Passenger
4.3L CSFI V6 • 3.73 G80 • 4" OV lift • 30" AT tires
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Re: No Rear Heat

Postby bkzxclusive » November 4th 2008, 3:12pm

where under the dash is the heater core, I'm having heating and AC prob. my AC would only work rite after i recharged it, im guessing theres a leak here but my heat just went out and i cant seem to find the prob.
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Re: No Rear Heat

Postby bkzxclusive » November 11th 2008, 7:34pm

Hey I also have this prob. but i have additions to this prob. wen i turn on my rear AC only the top vents in the bak go on nice and cold, and wen i turn on my rear heat, only my bottom vent behind the drivers seat starts to blow COLD also, its sounds lik a really confusing prob.
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Re: No Rear Heat

Postby speedy266 » July 14th 2009, 1:49am

I connected the two small vacume lines to each other as well. Having full heat all the time going to the rear, with only controling the rear fan speed. Is this ok to do? Would any other problems arise from this setup?
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