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HVAC stops working under engine load. #734411
March 28th 2018 2:30 pm
March 28th 2018 2:30 pm
Joined: Sep 2015
Posts: 89
So-Cal
C
chevydude1987 Offline OP
journeyman
chevydude1987  Offline OP
journeyman
C
Joined: Sep 2015
Posts: 89
So-Cal
To Yosemite last year and to the Grand Canyon this year, all from So-Cal, when pulling a hill, the vents stop blowing. Well, depending on the hill, the HVAC will slow, but on a big hill, the HVAC will just stop. Any ideas?? Yellowstone may be next year so getting my HVAC to work won't be a rush. Thanks all.

Re: HVAC stops working under engine load. [Re: chevydude1987] #734412
March 28th 2018 2:51 pm
March 28th 2018 2:51 pm
Joined: Aug 2001
Posts: 11,783
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
Maniac
Joined: Aug 2001
Posts: 11,783
Fircrest, WA
Do you mean the blower motor stops working or do you mean the AC stops being cold? Many newer vehicles disengage the AC compressor clutch at full or near-full throttle. Might be what you are experiencing.


Windows- they're what make a van worth owning!
Re: HVAC stops working under engine load. [Re: chevydude1987] #734413
March 28th 2018 2:59 pm
March 28th 2018 2:59 pm
Joined: Sep 2015
Posts: 89
So-Cal
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chevydude1987 Offline OP
journeyman
chevydude1987  Offline OP
journeyman
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Joined: Sep 2015
Posts: 89
So-Cal
It's an '87. I'm not sure if it does disengage the A/C, but the A/C doesn't work. I believe the blower motor just stops.

Re: HVAC stops working under engine load. [Re: chevydude1987] #734414
March 28th 2018 3:10 pm
March 28th 2018 3:10 pm
Joined: Jun 2010
Posts: 14,019
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 14,019
Van Diego California
The 350 goes into self protection mode and disengages the compressor to give the motor more hp to pull that hill..... its designed that way

When your over the hill, the load is off the motor & the air comes back on .... yes

Last edited by frscke1; March 28th 2018 3:13 pm.

SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: HVAC stops working under engine load. [Re: frscke1] #734415
March 28th 2018 4:23 pm
March 28th 2018 4:23 pm
Joined: Sep 2015
Posts: 89
So-Cal
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chevydude1987 Offline OP
journeyman
chevydude1987  Offline OP
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Joined: Sep 2015
Posts: 89
So-Cal
Hey there buddy long time no talk . Hope you are doing well. But Yes, once I top the hill and ease up on the throttle the vent does come back on to whatever speed it is set at. But I have just the vents on not the AC since the AC is not working. So the compressor is not doing anything. Normal for a 305?

Re: HVAC stops working under engine load. [Re: chevydude1987] #734417
March 28th 2018 6:04 pm
March 28th 2018 6:04 pm
Joined: Mar 2011
Posts: 326
NY
J
jcd74 Offline
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jcd74  Offline
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Posts: 326
NY
Does it sound like the blower wheel is rubbing? Too much end play?

Re: HVAC stops working under engine load. [Re: chevydude1987] #734418
March 28th 2018 6:09 pm
March 28th 2018 6:09 pm
Joined: Jun 2010
Posts: 14,019
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 14,019
Van Diego California
Originally Posted by chevydude1987
But I have just the vents on not the AC since the AC is not working. So the compressor is not doing anything. Normal for a 305?


Time for a tune up ...I would say your at your weight limit for that motor ... no seriously the fan circuit is tied to the ac ... it kills any draw on the motor to stay running


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: HVAC stops working under engine load. [Re: jcd74] #734421
March 28th 2018 6:33 pm
March 28th 2018 6:33 pm
Joined: Sep 2015
Posts: 89
So-Cal
C
chevydude1987 Offline OP
journeyman
chevydude1987  Offline OP
journeyman
C
Joined: Sep 2015
Posts: 89
So-Cal
Originally Posted by jcd74
Does it sound like the blower wheel is rubbing? Too much end play?


The blower wheel sounds quite. Seems to be running great. Just blowing sound.

Re: HVAC stops working under engine load. [Re: frscke1] #734422
March 28th 2018 6:38 pm
March 28th 2018 6:38 pm
Joined: Sep 2015
Posts: 89
So-Cal
C
chevydude1987 Offline OP
journeyman
chevydude1987  Offline OP
journeyman
C
Joined: Sep 2015
Posts: 89
So-Cal

Originally Posted by frscke1
Originally Posted by chevydude1987
But I have just the vents on not the AC since the AC is not working. So the compressor is not doing anything. Normal for a 305?


Time for a tune up ...I would say your at your weight limit for that motor ... no seriously the fan circuit is tied to the ac ... it kills any draw on the motor to stay running


Did every tune up needed/....plugs, wires, cap & rotor, air/fuel filter, trans fluid/filter. I think that's everything for a tune up, right?? If it's suppose to kill the blower motor under a load, then thats a relief for sure. I know it's running normal than. Thanks all for the help again. On to the next thing....turn signal lever replacement.

Re: HVAC stops working under engine load. [Re: chevydude1987] #734424
March 28th 2018 8:45 pm
March 28th 2018 8:45 pm
Joined: Jun 2010
Posts: 14,019
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 14,019
Van Diego California
The #1 censor that the computer goes to is the Coolant Temp censor to see if the motor is running right cause if the motor is hot or tooo cold the comp can adj the fuel & timing. So if your CTC is caked with crap it doesnt give a accurate reading. The "cake crap" is like hard water crust in your home.

[Linked Image]


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
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