Question about 1999 Jeep Grand Cherokee

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Heat and cruise control issues

I got in an accident where a tractor tailor dropped its load in the road and I was forced to drive over top of some metal scaffolding. during the accident i popped three tires, bent three rims tore up my front traction bar and front axle.

Three weeks and a lot of hassle later I get it back from the shop and all is well except my heater only works out of the defrost gate no matter which option is engaged and my cruise control light comes on but it does not engage.

I'm guessing its a vacuum leak but I'm looking for some advice. can anyone help me out?

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Your idea sounds reasonable...what you need to do is see if vacuum is present under the dash (check any vecuum motor you can reach easily for vacuum) and, check under hood for vacuum hook-up at manifold, tracing it back to firewall. follow any "t's" in line to their destination to ensure they are plugged in also. Plastic lines used today are nice because they don't rot, but they can break when cold. You can "sleeve" any breaks with a small piece of rubber line.
If a shop did this work, why are they not involved...they got paid right?,

Posted on Mar 05, 2009

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The idea is to maintain cornering forces on braked wheels to ensure that
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or grip between tyres and carriageway should also be utilised as
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Why ABS? Although today commercial vehicle brakes are designed to a very high
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the tyres and the carriageway. The braking force is excessive and
the wheels lock up. Locked wheels no longer provide any grip on the
road and are almost incapable of transferring any cornering forces
(steering and tracking forces). This often has dangerous consequences:
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- The vehicle breaks away in spite of countersteering, and starts to
swerve.
- The braking distance is significantly increased
- Tractor-trailer combinations or semitrailer trains may break away or
jackknife.
Load sensing valve influence On dry roads today's load sensing valves (ALB) alone are often capable
of preventing the wheels from locking if the vehicle is unladen; they also
help the driver to effectively grade the braking process on wet road surfaces,
but they are unable to prevent locking as such (no slip monitoring).
In addition, they are unable to counteract any overreactions on the
part of the driver, or any variances in frictional or adhesion coefficients
which may apply to different sides of the vehicle, or indeed to its different
axles (?-split road surfaces).
Benefits of ABS: Only the Anti-Lock Brake System (ABS)
- guarantees stable braking characteristics on all road surfaces.
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Limits of ABS Although ABS is an effective safety device, it can not suspend the limits
defined by driving physics. Even a vehicle fitted with ABS will become
uncontrollable if driven too fast around a corner.
So ABS is not a licence for a maladjusted style of driving or failure to observe
the correct safety distance.
4
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Anti-Slip Regulation (ASR)
Why ASR? Increasing the engine output (accelerating) on a slippery road surface
can easily lead to the maximum adhesion on one or all powered wheels
being exceeded causing them to spin, especially if the vehicle is unladen
or partially laden.
Spinning wheels when driving off or accelerating represent a safety risk
just like locked wheel do when braking.
Reasons - Wheels that spin transfer just as little cornering force as locked
wheels.
- They also no longer transfer any tractive power onto the road.
Consequences - Vehicles that do not move or get stuck.
- Vehicles that can no longer be steered, jackknife on uphill uphill
gradients, or swerve in corners.
Benefits of ASR ASR prevents the powered wheel from spinning and provides the following
benefits:
- Tractive power and cornering forces are maintained.
- Stable driving behaviour is ensured when moving off, accelerating
and negotiating corners on slippery roads.
- The indicator lamp (if installed) is used to warn the driver of slippery
road conditions.
- Tyre wear is reduced to a minimum, and the motor vehicle's drive
train protected
- The risk of accidents is further reduced.
ASR and ABS: ASR represents a worthwhile addition to an ABS-controlled braking system.
All that is required to turn ABS control into full ABS/ASR control is
an ECU with the additional ASR function and a few additional components
for controlling the differential brake and the engine. This why ASR
is only available in combination with ABS.
Even a differential lock for off-road use and ASR do not exclude but complement
each other.
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be achieved by a motor vehicle with only one driving axle - not even with
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