metallica21156

I have a friend of mine whose jimmy is having lots of problems. the CPI is shot and i think the EGR needs to be cleaned. Any way the major problem he wants to deal with now is that the AC and heat doesn't work. i checked the fuse ands all's good there. he said that sometimes it will come on and then it will just shut off. if you turn the switch it sounds like you can here the vacum working. is there any way to test the fan speed switch?

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95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler, 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.

71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.

90 cav, 2.2 tbi, gas getter.

Rick Norwood

It almost sounds like the freon is too low. There is a low pressure switch somewhere in the system usually on the accumulator (big silver canister), which is normally by the passenger's side fender wall in the engine compartment. It might also be a bad connector to this same switch or a bad switch itself. My daughter's 95 Chev Pick-up 4.3L just had the same problem last week. We ended up replacing the actual low pressure switch itself. One way to test it is to GENTLY wiggle the Harness/Connector right at the switch and see if it kicks on or stays on. The other thing that I learned was that this switch can be removed without loosing all of the freon in the system, as it has the tire valve type (Schrader valve?) valve under the switch.

When it does run, is the air cold?

metallica21156

i kinda knew about the ac not working. the problem is the fan doesn't even run either postion. heat or cold. it will run and you shut the truck off and later turn the truck back on and it doesn't work.

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95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler, 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.

71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.

90 cav, 2.2 tbi, gas getter.

Rick Norwood

I have had those blower fans crap out on me before. Unplug the fan at the connector and run a hot jumper wire straight from the battery to the connector to see if the fan itself works. I'm not sure how the fan assembly is grounded but check to see if the ground is good. If all checks out good I'd look at the switch.

BlazerLT

Will the fan run in the high position.

If it only runs in high, the resistor pack is shot.

If not, the switch is bad or the blower motor is shot.

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1995 Factory Blazer Service Manual for sale, PM if interested.

metallica21156

see thats the thing. you leave it all turned on and its running. turn the key off and turn it back on and it doesn't work. keep in mind that i didn't touch the controls. just turning the key of and back on stoped it. fuse is also good.

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95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler, 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.

71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.

90 cav, 2.2 tbi, gas getter.

BlazerLT

You didn't answer my question.........

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1995 Factory Blazer Service Manual for sale, PM if interested.

metallica21156

it will work in all the settings(when its working), AC,Heat,Hi, Lo, the ac doesn't work because of a low charge.

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95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler, 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.

71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.

90 cav, 2.2 tbi, gas getter.

BlazerLT

I am talking about the FAN, not the CONTROLS.

Your first post states your FAN doesn't work properly.

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1995 Factory Blazer Service Manual for sale, PM if interested.

biv343

Had the same issue with my Bravada, and it was the blower motor itself, not the resistor pack or the controls. It would do the same thing - work until you shut the vehicle off, start it back up and the blower wouldn't come back on until it was damn good and ready. $65 for a blower motor fixed my issue.

metallica21156

any way to check if the blowers the problem. like i said before the fan when its working it will work like it should. ALL SPEEDS.

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95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler, 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.

71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.

90 cav, 2.2 tbi, gas getter.

BlazerLT

It is the switch or the blower motor itself.

Blower motor more than likely.

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1995 Factory Blazer Service Manual for sale, PM if interested.

metallica21156

if you hit where the blower is it will work. i think its the blower motor or a wire to it.

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95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler, 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.

71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.

90 cav, 2.2 tbi, gas getter.

Cadillakin'98

Sorry to be such a smart ass, but what makes you think that?


HERE'S YOUR SIGN

ZL1power69

because its my truck he's talking about. fan runs in any position>turn key off and then back on again a sec later>fan doesn't run. BUT if if you pop the hood a hit the fan housing it clicks back on. there is a bad ground on the fan side of the connector.

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2000 Chevy Blazer ZR2
Performance: AEM intake, TB mod, ported stock y-pipe w/precat deleted, 3in catco cat, 2.5in Flowmaster 40 DF,
March pulleys, MSD SF ignition, Taylor 8.2 wires, Transgo shift kit, Corvette servos, B&M trans cooler.
Suspension: Knaffle 1.5in lift shackles, 1.25in rear wheel spacers, 31in BFG AT's
Exterior: custom ZR2 decals, bug guard, vent visors
Interior: Lanzar headunit w/ ipod input, Pioneer speakers, Scanguage II

http://www.cardomain.com/ride/3013891